Silicone Structure Glassing Manual

7/30/2019 Silicone Structure Glassing Manual

1/52

SILICONE STRUCTURAL

GLAZING MANUAL


2/52

IMPORTANT INFORMATION

Th t ctd h d d th d D C

ch d d t cct. H, c cdt d thd

dct yd ct, th t h t d

ttt ct tt t tht D C dct

y tcty y cc ct. D C ty

tht th dct t t ct cct. Y c dy ch ch ty td t d ch c ct

y dct h t th th td.

Dow Corning speCifiCallY DisClaims anY oTHer express or

implieD warranTY of fiTness for a parTiCular purpose or

merCHanTabiliTY. unless Dow Corning proviDes You wiTH

a speCifiC, DulY signeD enDorsemenT of fiTness for use,

Dow Corning DisClaims liabiliTY for anY inCiDenTal or

ConsequenTial Damages. suggesTions of use sHall noT be

Taken as inDuCemenTs To infringe anY paTenT.


3/52

Silicone Structural Glazing Manual

Contents

Introduction.......................................... 5 Project Review.............................................5

D r ...........................................5

stt d mt a ...............5

Product Quality............................................5

Jt pt d st act .5

qty Ct ..........................................5

Dctt ...........................................5

Dow Corning Product Offering........... 6 Structural Glazing Silicone Sealants ...........6

Dow Corning 993 Structural Glazing

sc st ..........................................6


sc st ..........................................6

Insulating Glass Silicone Sealants ...............6

Dow Corning 3362 it g

sc st ..........................................6

Dow Corning 3793 it g

sc st ..........................................6

Weatherproong Sealants ............................7

Dow Corning 756 sms

bd st .........................................7

Dow Corning 791 sc

Weatherproong Sealant ............................7

Dow Corning 757 s Hyd d

Weatherproong Sealant for

phtctytc C g ........................7

Dow Corning 797 sc

Weatherproong Sealant ............................7 Cleaners and Primers ...................................7

Dow Corning r-40 C .......................7

Dow Corning 3522 C st

Ccttd ..............................................7

Dow Corning 1200 os p ...................7

Dow Corning p C ..............................7

Dow Corning p p ...............................7

Project Review...................................... 8

Dow Corning Project Support .....................8 Product Recommendation ...........................8

D r ...........................................8

stt d mt a ...............8

adh Tt....................................8

Ctty Tt .............................9

n-st Tt ..................................9

oth lty Tt .......................9

s s ................................9

wty .................................................9

Project Workow Diagram ........................10

Structural Glazing Design .........................11

e Tchc a (eTa) .......11

European SG Project Checklist

Cct Coins ................................11

Structural Glazing Joint Dimensioning .....12

Structural Glazing Terminology...............12

stct bt ......................................12

Thickness .............................................12

Structural Glazing Joint Dimensioning

gd ................................................12

wdd d g D ...........14

stct bt Cct

wdd d g D ...........14

Th Dtt ...............................14Glueline Thickness Calculation for

Th Dtt ...............................14

Ddd ..............................................15

stct bt Cct

Ddd.........................................15Structural Glazing System Types .............16

4-Sided Structural Glazing...................16

2-Sided Structural Glazing...................16

Slope Glazing.......................................16

std g .......................................16U-Prole Systems ................................16

Tt v syt ............................16oth syt Ty .................................17

stct g syt......................17

stct attcht n-g

mt ..............................................17

Protective Glazing................................17stt d mt stct

Glazing Applications................................18

D C e adh/Ctty gd.............................18

Aluminium Proles ..............................18

st st ......................................18

ltd g...................................18


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Contents

Ctd, sd d Ttd g ......18

s-C d

ey-t-C g .............................19

Gaskets and Rubber Materials .............19

Product Quality .................................. 20 General considerations ..............................20

mt t d hd ..................20

sh ...................................................20Factory vs. Site Glazing ...........................20

Jt pt d

st act ..................................20

qty Ct ........................................20

One-Component Sealants ..........................21

st Tt d Cdt .......21

Skin-over time/elastomeric test................21

Two-Component Sealants ..........................22

st Tt d Cdt .......22

T-Ct D et

gd ................................................22

Surface Preparation and

Sealant Application....................................24

stt C pcd ..................25

n-p stt .........................25

p stt .................................25

st Cdt ..........................25

Masking................................................25

T-cth c thd ..................25

stt p pcd....................26

pc th p ......................................27Site Glazing Considerations.....................27

Sealant Application and Quality Control

Procedures .................................................28

st act pcd .................28

st C rt ......................28

Site Glazing Cure Requirements..............28

Factory Glazing Cure Requirements........28

Reglazing Procedures...............................29

Reglazing Due to Glass Breakage........29

Reglazing Due to System Failure ........30qty Ct Tt pcd ..............31

g Cdt ........................31

st pdct qty Ct .....31

g Tt ...........................................32

Buttery Test......................................33

s T Tt ...................................34

m rt Tt...............................35

adh d C

qty Ct Tt ...........................36

p adh Tt .............................37

H-pc Tt .......................................38

Deglaze Test .........................................41

Documentation ..........................................42

pdct d qty Ct adt .....43

mtc .............................................44

European SG Project Checklist................45

SG Project Testing Submission ................46

st pdct qty Ct l..47

st adh qty Ct l

(p adh Tt) ................................48

st C qty Ct l

(H-pc Tt & etc Tt) ...........49st adh d C qty

Control Log (Deglaze Test)......................50

Dow Corning Construction Sales Ofces..52


5/525


Introduction

Silicone structural glazing is a method utilizing a

c dh t ttch , t, th

t t th tct d.

wdd d th ct d th d

td th , thh

th tct c t t th tct

th d. Th c t t t

dh d ch tty th d

subjected to windload and thermal stresses.

Structural glazing (SG) is a high performance

ct d t c t

t th ct. oy c

t hch h dd d ttd

specically for structural glazing applications

hd d. Th Dow Corning tct

glazing sealants recommended for this application

are identied in the next section of this manual.

echDow Corning structural glazing sealant has

td e Tchc a(eTa) thh ddt tt ccd t

the current European structural glazing standard:

e Tchc a gd (eTag

002). The sealants also have a CE mark which

dct cty t e hth, ty

d t tct t.

Th tdd t dc th

d d Dow Corning c

sealants in structural glazing applications. Thecdt d th d

th c Dow Corning t

structural glazing projects for over 30 years.

Because structural glazing projects differ in

d d, t d ct

t, th ct dd

tt. Dow Corning Tchc

sc e t t y

your specic project needs.

The success of every structural glazing project is

ddt th t th d

, t d Dow Corning.

Successful structural glazing projects contain the

following elements:

Project Review

Design ReviewDow Corning t d th

structural joint design on every project.

Substrate and Material Approval

Dow Corning t tt d

t tht ctct th tct c

sealant. Specic project testing will be required

yDow Corning t c.

Product Quality

Joint Preparation and Sealant Application

Dow Corning joint preparation, sealant handling

d t ct cd t

cty d.

Quality Control

Dow Corning ty ct cd t

d.Dow Corning t th t

th dt chty ct .

Documentation

qty ct cd d t t

dctd y t h.

qty ct tt dd th

Dctt ct th .

i t ct th , ch

th tt t dcd t dt.


6/526


Dow Corning Product Offering

Dow Corning t hh

c c t. ech t

developed and tested for a specic application

d hd y d tdd

specically approved byDow Corning.

Specic product information is available at

.dc.c.

Structural Glazing Silicone Sealants

Th Dow Corning c t

offered for structural glazing applications:


Silicone Sealant

Dow Corning 993 Structural Glazing Silicone

st t-ct, t c, t-

c c t tdd tct

d , t d th t.

wh cd t ct -ctc t, th t c t

Dow Corning 993 cd dct

of structurally glazed curtainwall units.

Dow Corning 993 hh d t th

ct dh t d t.

Dow Corning 993 h td e

Tchc a (eTa) d ddt

tt ccdc th th ct e

structural glazing guideline ETAG-002. The

dct h td Ce- d

th .


Silicone Sealant


st -ct, t-c

c t tdd tct d

, t d th t.Dow Corning895

hh d t th ct dh

t d t.Dow Corning895 h

td e Tchc a(eTa) d ddt tt ccdc

with the current European structural glazing

d eTag-002. Th dct h

td Ce- d th .

Insulating Glass Silicone Sealants

Th Dow Corning sc st

d t ct.

Dow Corning it g sc st cdd t t

which are structurally glazed withDow Corning

Structural Glazing Silicone Sealants.Dow Corning

it g sc st dd

d tdd t ct

y d hd d tct

glazing adhesives. For more information on the

c t t

ct, t th Dow Corning

it g m hch t

.dc.c.

Dow Corning 3362 Insulating Glass

Silicone Sealant

Dow Corning 3362 it g sc

st t-ct, t c, t-

c c t tdd

secondary seal in dual glazed insulating glass

t. Dow Corning 3362 it g

st h td e Tchc

a (eTa) d ddt tt

ccdc th th ct e tct

glazing guideline ETAG-002. The product has

td Ce- d th .

Dow Corning 3793 Insulating Glass

Silicone Sealant

Dow Corning 3793 it g sc

st -ct, t-c

c t tdd cdy

seal in dual glazed insulating glass units.


7/527


Dow Corning Product Offering

Weatherproong Sealants

Dow Corning oe a ull lne o hgh peoance

sealants for weatherproong applications. Following

a e decpton oDow CorningWeatherproong

sealant. Thee ealant ae degned and ntended to

weatherseal building joints and should never be used as

structural glazing adhesives. For more information on

the proper use of silicone sealants in weatherproong

applcaton, pleae ee to the Dow CorningBuilding Envelope Weatherproong Manual which

avalale at www.dowconng.co.

Dow Corning 756 SMS Building Sealant

Dow Corning 756 sms buldng sealant a one-

coponent, low odulu, and neutal-cung lcone

sealant designed specically for weathersealing

o entve utate uch a natual tone and

alunu panel yte whee the aethetc

peoance o the ealant potant. Th ealant

degned to e non-tanng on natual tone and

to attact le dt and atophec contanant

than conventonal lcone uldng ealant.

Dow Corning 791 Silicone

Weatherproong Sealant

Dow Corning 791 Silicone Weatherproong Sealant

a one-coponent, low odulu, neutal-cung

silicone sealant with a faster skinning time for

geneal weatheealng applcaton.

Dow Corning757 Si Hybrid based

Weatherproong Sealant for

Photocatalytic Clean Glass

Dow Corning 757 Si Hybrid based Weatherproong

sealant a one-coponent, low odulu ealant

degned o weathe ealng o hydophlc and

photocatalytc clean glae.

Dow Corning 797 Silicone

Weatherproong SealantDow Corning 797 Silicone Weatherproong Sealant

a one-coponent, low odulu, neutal-cung

lcone ealant wth a longe toolng te o

geneal weatheealng applcaton.

Cleaners and Primers

Dow Corning c d

that are developed specically for use with

Dow Corning t. i tc,

specic cleaner or primer will be required for the

c t t ch t dh t

specic substrate. For general substrate cleaning

d cdt, t th Dow Corning e adh/

Ctty gd hch t

.dc.c.

Dow Corning R-40 CleanerDow Corning r-40 Cleane a pecally oulated

t d dd t c d t

proles used in structural glazing applications.

Dow Corning 3522 Cleaning Solvent

ConcentratedDow Corning 3522 Cleanng solvent Concentated

a cleane degned o the olvent pugng o two-

coponent ete x equpent ued n tuctual

glazing and insulating glass production. This product

doe not contan halogenated olvent and ha een

specically developed to digest cured silicone

ealant peent n equpent hoe and xe.

Dow Corning 1200 OS Primer

Dow Corning 1200 os p -tchc ttt dd th

Dow Corning t ty ct.

Dow Corning Primer CDow Corning p C -t chc

ttt dd td d

tc c t t t dh

dt.

Dow Corning Primer PDow Corning Primer P is a one-part lm forming

dd tt

th ct.


8/528


Project Review

Dow Corning Project Support

Dow Corning t t

y th t t th d d

Dow Corning Structural Glazing Sealants

for your project. All structural glazing projects

t d d d yDow Corning

on a project-by-project basis. Only through

ct th cd cdd

th Dow Corning stctAdhesion Limited Warranty for your project. For

th c t,

t th Dow Corning Project Workow Diagram

t th ct.

Product Recommendation

Dow Corning will make a project specic product

cdt c th t h

been taken:

Design Review

Dow Corning must review the structural glazing

joint design for every project. A European SG

Project Checklist should be completed for each

project. A joint dimensioning calculator and SG

Project Checklist are available at Dow Corning

Coins hch c ccd thh

Dow Corning p. p ctct y c

Dow Corning Construction Ofce for more

information. A European SG Project Checklist

dd th Dctt ct th

.

Dow Corning t dt ch sg

joint dimensioning. If a standard aluminium

prole manufacturer system is used, the system

c dd. Dow Corning h

cc t th d dt t c

prole manufacturers.

All non-standard SG joint designs must beprovided

electronically using .jpeg, .pdf, .doc, .dwg or

.t t t [email protected].

D dt y d t th

E-fax number: +32 27 06 50 59.

Dow Corning will review your SG Project

Checklist and SG joint dimensioning within three(3) working days if provided electronically and in

th dcd .

Substrate and Material Approval

Dow Corning t tt d

t hch ctct th tct c

t. i tc, t y

ttd thh th yt ct

and project specic testing is not required for

. f ct cdt t th Dow Corning e adh/

Ctty gd hch t

.dc.c.

Adhesion Testing

st dh th t ctc

components of a successful structural glazing

project. Dow Corning t y

tt y t ct

cc. Dow Corning tycy

tht tt ch tt

(aluminium prole, enameled glass, coated

, tc.) dd t th Dow Corning

st Tt lty dh tt.

a tt tt hd

dcd dtc t tt

used in the actual structural glazing production.

it th ty th sg ct t

tht tt t t

Dow Corning tt. u ct

tt, Dow Corning d ttdct cdt, c t d

priming recommendations. Testing takes four (4)

weeks from receipt of samples.


9/529


Project Review

Compatibility TestingIncompatible glazing accessories may cause

t dct d/ t dh

. Dow Corning must approve all glazing

ccy t y t ct

cc. Dow Corning tycy tht

representative samples of each material (gaskets,

spacers, backer materials, setting blocks,

tc.) dd t th Dow Corning stTt lty ctty tt.

it th ty th sg ct t

tht tt t t

Dow Corning tt. u ct

tt, Dow Corning d tt

product recommendation. Testing takes four (4)


Non-Stain Testing

Dow Corning tt tt

t dt t t c t

resulting from the migration of uids into the

tt. Dow Corning tht

tt th tt

(t, , t dt)

dd t th Dow Corning st Tt

lty -t tt. u ct

tt, Dow Corning d tt

product recommendation. Testing takes six (6)


Other Laboratory Testing

Dow Corning y d -tdd tt

ch ytc tt H-c tt

dct . i ch c, c

y chd. p t th

project, please contact your local Dow Corning

Construction Ofce for a service fee schedule.

SampleSubmission

f t c tt t,

t t tt thhDow Corning

Cotct indty syt (Coins) hch

c ccd thh Dow Corning p

t. p ctct y cDow Corning

Construction Ofce for more information. A

Structural Glazing Project Testing Submission

f th Dctt ct th . Tt hd t t

the following location:

Dow Corning s.a.

pc idt

Z C

b-7180 s

Attention: Sealants Testing Lab

Warranty

Dow Corning offers a project specic Structural

Adhesion Limited Warranty for projects using

th Dow Corning 993 Structural Glazing

sc st Dow Corning 895 stct

Glazing Silicone Sealant. Please contact your

Dow Corning Construction Ofce for more

t th t . T

t ty, th t t

completed:

1. Dow Corning t t t hch ctct th Dow Corning

Structural Glazing Sealant for adhesion and

ctty

2. Dow Corning t t th

structural glazing joint design

3. a dy ty ct t

ttd d d yDow Corning.

4. Th t t t th ty

thhDow Corning Coins.


10/5210

DC dctt d

ty t d tyt sg act th ty

requirements are satised.


Project Review

Project Workow Diagram

sg act ct tyt DC Coins. Ctd

qC ttd t DC.

sg act ct st

pdct, adh d C

qty Ct pcd

td sg m. rt

dctd qty Ct d

Tcty l

sg act ct sg t

cc thDow Corning

e sg m. rcdd

c t d t

ct cd d

d dct.

Dow Corning tt tt

dh, ctty d -

t. Dow Corning d tt t th sg act

within four (4) weeks with specic

c t cd

sg act ct

sg s s DC

Coins. rtt tt

ttd t

Dow Corning dh,

ctty d -t tt

Dow Corning sg d d

d.Dow Corning

tt dd t sg act

th th (3) dy

t ttd DC Coins

SG Applicator completes SG Project

Checklist via DC COINS to Dow

C .

SG Applicator identies aluminum

system name or provides SG joint

dt ctcy e- t

Dow Corning.

Dow Corning d dc

t d/ dt sg

act t dct d

ty ct cd t

cc th DC t.


11/5211


Project Review

Structural Glazing Design

Guidelines for the design of structural glazing

joints are provided in this section. The guidelines

dd d Dow Corning t

experience in structural glazing. Not all design

d th d.

Dow Corning Tchc sc e

t h th d dsealant user in proper SG joint design.

it th ty th d

and sealant user to conrm that the information

dd t Dow Corning cct d

ct.Dow Corning dt d

make project recommendations only as they relate

t th tct c t. oth ct

yd th ct th t ct,

ch c th dty

th , th ty th yt

d d yt ct.

European Technical Approval (ETA)

Dow Corning td t cy th ct

e gd dcd t

e stdd Tchc gd ..

(eTag 002 gd e Tchc

Approval for Structural Sealant Glazing Systems

(ssgs) pt 1.) f tt tht td

th d,Dow Corning will make specic

project design recommendations. If the systems

manufacturer seeks compliance with ETAG 002

th t tdd, Dow Corning c

d cdt th t hch

cy t ty th d

tdd.

European SG Project Checklist Calculator

in COINSa thh Dow Corning p

Website is the project management system

cd Cotct indty syt

(Coins). wth Coins e sg

Project Checklist calculator which can be used

to calculate and submit an SG joint design for

Dow Corning. D ch d, dd, d

ty td t th cct. Th cct

will provide immediate conrmation if the

specic design parameters entered comply with

Dow Corning sg d. Th cct

h dt hth d t eoTa

Guidelines. Once the information is conrmed

as OK, the project parameters can be submitted

t Dow Corning . a tt

dd y Dow Corning

within three (3) working days. For access to

Dow Corning p d t

Coins, ctct y cDow Corning

Construction Ofce.


12/5212


Project Review


A structural glazing joint must be properly

dd th t t ct tdd.

If a joint is improperly designed, the sealant

t y c tty c

failure. Therefore, all SG joint dimensioning

t d yDow Corning.


Guidelines

f d tht y

Structural Glazing projects. Dow Corning t

review and approve all SG joint dimensioning.

ay ct t th d c y

d y y Dow Corning Tchc sc

e.

The minimum structural joint bite shall be asdtd y th stct bt Cct

wdd d g D.

The minimum structural joint thickness shall

be as determined by the Glueline Thickness

Cct Th Dtt.

The minimum structural bite shall be as

dtd y th stct bt Cct

Ddd.

The structural bite must be a minimum of 6

d th cct.

The glueline thickness must be a minimum of

6 d th cct.

The structural bite must be equal to or greater

than the glueline thickness.

The bite-to-thickness ratio should be between

1:1 and 3:1.

The SG joint must be able to be lled using

tdd t ct cd.

The SG joint design must allow the sealant

t tht t c c d ch

hyc t.

The above guidelines are minimum

t d cd y ct

tc.

Structural Glazing Terminology

Structural Bite

stct bt th dth ctct

c th c t th th

d th . Th d dd,

d, ct d, dd d d

th dtt t t cdd

th dtt th tct t

d

Thickness

Thickness is the distance from the panel to theframe. Proper thickness facilitates the installation

th t d dcd t t

dt th t t th

glass panel and frame. Thickness in a structural

silicone joint is often referred to as glueline

thickness.


13/5213


Project Review

GLASS

SILICONE

GASKET

SILICONE

SETTING

BLOCK

CLOSED CELL

POLYETYLENE

BACKER MATERIAL

STEPPED

INSULATING GLASS

UNIT

SPACER WITH

DESSICANT

STRUCTURAL

SILICONE

SEALANT

SILICONE

WEATHERSEALSEALANT

DOUBLE-SIDED

ADHESIVE FOAM

TAPE

POLYISOBUTYLENE

PRIMARY SEAL

SILICONE

SECONDARY

SEAL

GLASSTHICKNESS

STRUCTURAL

BITECONVENTIONAL

INSULATING

GLASS UNIT

ALUMINIUM

PROFILE

Typical Structural Glazing Detail


14/5214


Project Review

Windload and Glass Dimension

Th tct t t dcty

t t th dd th d d

th d th . Th hh th dd

d th th d th , th

t th t tct t d.

Th ct hch ct th

tct t t th

ht d d th d

windload that the structural glazing system must

dd t ccdt.

m stct bt () = g sht s D. () wdd (p) 0.5

140,000 p

Glass Short Span Dimension (SSD) is the shorter of the two dimensions of the rectangular glass

. f , 1.5 y 2.5 , th ssD 1.5 .

Windload is the maximum wind pressure in Pascal for a return period of 10 years based on

euroCoDes d c t. Th dd y th d t D

C. 1 p = 1 n/2

140,000 Pa (0.14 MPa) is the Maximum Allowable Design Stress for both Dow Corning 993

dDow Corning 895.

Maximum allowable design stress is based on the Ru,5 value with a safety factor of 6. The Ru,5value is the probability at 75% that 95% of the population will have a breaking strength above

th .

Thermal Dilatation

Th dt th t t th

d th tct

sealant joint a shear stress that must be considered

during the design of the SG joint. The amount of

dt t dd th

d t ( t t), -

tt ch d d th sg

yt. Th t t th

d t th t.

Minimum Glueline Thickness (m) = Thermal Dilatation (m) x E Young (Pa)3 m ad st sh

Thermal Dilatation is the amplitude of differential thermal movement between the glass and

.

E Young is Young modulus as determined byDow Corning.Dow Corning 993 h

Y d 1.4 mp dDow Corning 895 h Y d 0.9 mp.

The Maximum Allowed Stress in Shear is determined by Ru,5 value as determined in shear.fDow Corning 993 th 105,000 p. fDow Cornin 895 th

140,000p.

Structural Bite Calculation for Windload and Glass Dimension

Glueline Thickness Calculation for Thermal Dilatation


15/5215


Project Review

Deadload

i td sg d, th ddd ht

th td y th tct c

joint. This situation commonly occurs when

structural glazing is used on monolithic glass.

Dow CorningStructural Glazing Silicone Sealants

c t th ht th dd

t d t cd th d d t

ddd.

Provided the horizontal frame members are as

d th tc ,Dow Corning

consider both the vertical and horizontal or long

d th th ddd cct. i

the horizontal frame members will not support the

d dd, y cd th tc

th cct.

Min. Bite (m) = 2,500 kg/m3 9.81 /2 x Glass Thickness (m) x Glass Dim (m2)

[2 x Height (m) + 2 x Width (m)] x Allowable Design Stress for DL

2,500 kg/ m3 is the specic mass of oat glass corresponding to approximately 25,000 N/m3

of specic weight.

9.81 m/s2 ct ty

The Allowable Design Stress for Deadload (DL) forDow Corning 993 11,000 p. Th

a D st Ddd Dow Corning 895 7,000 p.

If calculation should be compliant with ETAG002 or if the horizontal frame members will not

be supporting the glass or will deect under the deadload of the glass, just consider 2 x Height (m)

th dt th cct.

Structural Bite Calculation for Deadload


16/5216


Project Review

Structural Glazing System Types

Th y dt ty tct

glazing systems available. Common to all of these

yt tht tct c t d

t tcty ttch th t t

th d tct. s th c

ty yt dcd th ct.

4-Sided Structural Glazing4-sided structural glazing is the most common

and usually most cost efcient type of structural

glazing system used in European countries.

g td d th

th tct c. 4-dd sg yt

tycy ctd dct cty d

erected at a jobsite.

2-Sided Structural Glazing

2-sided structural glazing systems use structural

c t th d th . Th

th t d th th chcytd t tcty td y

. 2-sdd sg yt ctd

production facility or at the jobsite.

Slope Glazing

Slope glazing is when structural glazing is

d d tht t tc. Tyc

slope glazed SG systems are skylights. In such

c, th ht th cdd

the SG joint dimensioning calculations. For

slope glazing applications, European regulations

th td ty . itd

slope glazing has also been used successfully onnumerous projects.

Stepped Glass

Many SG systems install the SG joint on the

t c th td . i th

yt, th t t dcd

in a step fashion which allows glazing to the

td . m tdt sg yt

install the structural joint to the internal surface

th d th t t.

Please refer to Typical Structural Glazing

Dt 13 tyc

td sg yt.

U-Prole Channel Systems

Th y ty yt tht

t t t ttchd chcy

to the structure by a U-prole in the cavity

t th t . Dd

th t th yt, th c t y

or may not be performing as a structural glazingt th d. Th yt t

d yDow Corning Tchc sc

Engineers on a system specic basis.

Total Vision Systems

Tt yt, hch cy d

at the front of a building to maximize vision area,

use a glass n to structurally support the vision

. i ch c, th 2-dd sg yt y

th tct c h th edge to the glass n. Dow Corning t h

d t tcty dd thy

ddt t d.


17/5217


Project Review

Other System Types

Structural Glass Systems

stct g syt, t cd sd

syt btd syt, h d

many high prole buildings. Holes are typically

dd ch c ch d th

ttchd chcy th t

t d. Th yt t tctglazing although they have a similar appearance

th t. i ct d, th d

y ttch t th t t

t. i ch d, th t

t h tct ct. i

ty stct g syt, c

t y tt t

ttht th d th c

th t t.

Structural Attachment of Non-Glass

Materials

stct c t c d t ttch

t th th . Dow Corning t

tt d th t t

specic basis. Examples of such materials include

ct t, t depoxy-backed thin stone panels.

Protective Glazing

stct c t cy d

d yt hch dd t tt

th ct t t. i

cases, these systems are also structurally glazed.

The use of structural glazing in bomb blast

tct d d t d h

been done successfully on numerous projects.i th d, th t y t

of a complex glazing system which includes the

, d t. Th tct c

t y tt y ch th

t th d t

ct. D t th hyc d

chc t c (.. ctc

t, t dh d dty)

hch c t d t d, hh

c tct c t th

t chc th ct. f

assistance in protective glazing designs, please

ctct y Dow Corning Tchc sc

e.


18/5218


Project Review

Substrates and Materials for Structural

Glazing Applications

it tt th d sg yt

tht th t d. athh

Dow Corning tt d

materials on a project by project basis, certain

cdt c dd d

the design phase of the project.

Dow Corning Europe

Adhesion/Compatibility Guide

a t .dc.c th

Dow Corning e adh/Ctty

Guide. This guide summarizes cleaning and

cdt Dow Corning

st ty c ctct

t. Th c t

recommendations for specic aluminium prole

ct d ctd, d d ttd dct. a cdd d

specic compatibility recommendations on

laminated glass products, gaskets, tapes and other

t. Th d dcy dtd

th t d cdt.

Aluminium Proles

Dow Corning works closely with most of the

major aluminium prole manufacturers in Europe

t y th yt. Dow Corning h t dt dh tt t th

proles from these manufacturers. Aluminium

proles, whether anodized or painted with a

yt d ct (ppC), t

chtct d ty (qualanoD

qualiCoaT).

Stainless Steel

st st h d ccy

structural glazing substrate. The stainless steel

t chtct d ty d

hd ttd tDow Corning dh

d ctty tt.

Laminated Glass

Some laminated glass which utilizes polyvinyl

ty (pvb) y dt t 6 h

ctct th t c c t.

Th h y thtc cc d

d t ct th c td

in structural glazing applications. For specic

ctty t d cdt,

t thDow Corninge adh/Ctty gd hch t

.dc.c ctct y td

..

Coated, Spandrel and Tinted Glass

Th y ty ctd, d

d ttd t t th

yt d. Th y tt

cdt th ct . f

specic recommendations, please refer to the


gd ctct y Dow Corning Tchc

sc e. f th

general recommendations:

Soft coating must be completely removed

c t c tct

c t. Th ct d t d

dt tth d dty t

tty th tct d. st ct

are often very difcult for silicone sealant todh t. rd t ct th

c y c t dh

ty t ( c).

Hard coatings are acceptable surfaces for

structural glazing if these products have

dttd t tty d t

adhesion has been veried through testing by

Dow Corning.


19/5219


Project Review

Ceramic enameled spandrel coatings

which are baked onto the glass during glass

dct d hch t d c

ty ct cct c

structural glazing. Some patterned glasses are

difcult to adhere to and must be submitted

ty tt y Dow Corning

t .

Tinted glass, like clear oat glass, tempered

d ht tthd , cct

for structural glazing. Sandblasted or acid-

etched glass may be difcult to adhere to and

t ttd tDow Corning tt

t .

Self-Cleaning and Easy-to-Clean Glass

Th ty d

tc t th d

d h ty ct y. fct cdt th ty,

please ask the glass manufacturer and refer to the


gd ctct y Dow Corning Tchc

sc e.

Gaskets and Rubber Materials

Th y ty t tht

d d d

may not be appropriate for structural glazingct. a ct t

y td th c

plasticizers that may leach into the structural

c d c dct, t d

tty t dh t tt.

Dow Corning cd tt d

of materials on a project by project basis. Some

SG Systems have qualied and pre-tested their

specic rubber materials. Historically, certain

t ty h t t structural glazing. Following are some general

guidelines for gaskets and rubber materials:

A structural spacer material in direct contact

th th tct c t y

ct. mt ch c

t, yth ythy

t ct hh ty

y d pvC t h ttd d

d t cct th ct.

100% silicone polymer extrusions and gaskets

d th t ctty th

c t.

Gaskets and setting blocks made of neoprene

epDm tycy dc ht cd

c th t. Th

t hd t d ctct

th th tct c t y h

cdt ctct tht h ct

on the performance of the sealant. Project

specic compatibility testing will determine

th tty th t thct.

Highly plasticized gaskets and extrusions

hch c t dh t

d y ctct thDow Corning

stct sc st.


20/5220


Product Quality

Dow Corning t ty

c tt ct ct

ccdc th iso 9001 tdd. Th ct

th tdd t d th t

th cd d cdt

th t, hd, d ty

ct Dow Corning Structural Glazing

sc st. a t , y t d,

dtd d cy th cd

d cdt t th th ct

th . i y h t d

y th cd

cdt, ctct y c

Dow Corning Construction Ofce or your


t th Dow Corning st.

General considerations

Material storage and handling

Dow Corning st t td t th

cdd tt d t.

ec tt t y c

t t dd. st c, dh d

hyc t cd hd th t

t hdd d td y. Th t

t dtd d cdt

th d t

t-ct c t.

Shelf life

Dow Corning st t d th th

ttd h . st tht d yd t

ttd h y t c y t t

hyc t d t t d.

Factory vs. Site Glazing

Structural Glazing fabrication may occur in

a production facility or at the job site. Two-

ct tct c t tycy d th ctd t

dct cty.

o-ct tct c t y

d dct cty t

or at the job site. All parties involved with a

project, including the architect, engineer and

control bodies must support site glazing for a

specic project. Specic local requirements may

not permit site glazing in some instances. Cure

requirements and considerations for site glazing

dcd t th ct.

Joint Preparation and Sealant Application

Specic procedures and recommendations on

joint preparation and sealant application are

d t th ct. Th cd d

cdt h t

sealant adhesion, cure and joint ll. Ignoring

or skipping a step in the process could have an

d ct th c th tct

c. Th cd hd dtd

d cty d y th t .

Quality Control

a ch qty Ct th

t ctc t cc tct

glazing project.Dow Corningd cd

d cdt tht t cty

dtd d d y th t .

Th cd t ct d

. i th Dctt ct th

, Dow Corning d ty ct hch c d y th t .

Dow Corning t y th dt

ch ty ct .

Dow Corning dt dct cty

and make recommendations for improvement if

cy. lt th ct t ctc

d sg dct ct.


21/5221


Product Quality

One-Component Sealants

Storage Temperature and Conditions


st t td t tt

+30C. An expiry date is clearly marked on the

product packaging. Sealant should only be used if

it is within the expiry date shown on the package.

The sealant should be kept in its original unopenedpackage until the sealant is to be used. Sealant

hd td d dy t.

Skin-over time/elastomeric test

A skin-over time and elastomeric test should be

d c dy d ch t

t t d. Th th tt t

tht th t c y d h tyc

tc t. ay t ch

excessively long skin-over time may indicate thatth t t h h td

at excessively high temperature. Skin-over time

y th tt d hdty. Hh

tt d hh hdty c th

sealant to skin-over and cure faster.

Th cd t d

y t d dct.

pdct ty ct cd, ch

dh tt dct t,

dcd t th ct.

1. Spread a 2 mm thick layer of sealant on a

ythy ht.

2. Every few minutes, touch the sealant lm

lightly with your nger.

3. wh th t dh t y

nger, the skin-over time has been reached.

If the skin-over time is greater than 2 hours,

d t th t d ctct y

Dow Corning Construction Ofce.

4. a th t t c 48 h.

at 48 h, th t th

ythy ht. sttch th t y

t dt hth t h cd t

tc t. a ct

d t c d c. i

th t h t cd y, d t

th t d ctct y Dow Corning

Construction Ofce.

5. rcd t y qty Ct .

a qty Ct

th Dctt ct th .

Th ctd hd td d y Dow Corning

t.


22/5222


Project Quality

Two-Component Sealants

Storage Temperature and Conditions


st t td t tt

+30C. An expiry date is clearly marked on the

product packaging for the curing agent and base.

st hd y d t th th

expiry date shown on the package. The sealantshould be kept in its original unopened packages

t th t t d. st hd

td d dy t. Ct

c t d t t-tchd.

f ctc t t t th dt

container of material rst.

Two-Component Dispensing Equipment

Guidelines

Dow Corning 993 Structural Glazing Siliconest hh c t, hch

certicated and approved by ofcial authorities and

test institutes for structural glazing applications.

py d, th t d ct

-t dh d dty, hch

necessary for structural glazing applications.


st cct d

y th t t ch t tdd

c. stt th t tchy th

ct t-ct t

htctd , t d

ch th th dyc ttc .

Th dt ch

t. Th d ch

the market are all different in design, so therefore

Dow Corning ty cd tht th

t th d dd y

th t d th

d tc th d t.i ddt t th d th t

, Dow Corning cd tht th

t dtd d c th th

following best practices:

Provide Proper Sealant Storage Conditions

st ct t td th

t cdd t tt

+30C. Sealant can be used at temperatures of

up to +40C. If a sealant container is kept in a

dct cty t tt tthan +30C for one week, replace the material.

Ct hd td th

d ct.

Maintain Proper Production Facility

Temperature

at tt th dct cty

must be between +10C and +40C. For best

c, t tt t

+18C to +30C. At colder temperatures,

between +10C and +18C, cure rate and

dh dt . i hh

temperatures, between +30C and +40C,

working time will be shorter.

Avoid Excessively High Humidity

i hh t hdty, th t

cure faster and have a shorter working time.

ecy hh hdty (>80%) cd c

t th tt c d dy

affect sealant adhesion. To minimize the damage t th dd t ct,

pails and drums must be kept airtight during

t d t cd th d

t. wh t, th

inside the drum or pail must be ltered and dried

(silica gel lters are recommended).


23/5223


Product Quality

Curing Agent Must Be Homogeneous

p t c t th d

t, th c t hd y

ctd d ttd th t

hty. D t ct c

d th c t. l d

d cty c t (stdd & Hv)

are more likely to show separation and should be

d t . Hh cty c t(Hv/ger) d t y

but it should be checked in all cases before use.

it cdd t th c t t

th dy th d t chd t

th c t t d-.

Properly Maintain Sealant Dispensing

Equipment

it t tht th t th

ty tht tht th td t ct y.

bc th y dt ct

d t, tc

t d. rt c

to all equipment manufacturers include:

Sealant must be dispensed free from

t .Dow Corning 993 stct

Glazing Silicone Sealant must be processed

cd yt t .

a tdcd d th ch t

ct t cty d t

ushed out of the system prior to use.

Regularly inspect and maintain components

th d t. a c

ctd t th t th

is defective or gaskets have hardened or

dd t th

yt. wh hh

t th t yt,regularly check the follower plate to ensure

tht t thy d t

blocked by a damaged drum or pail or by a

damaged or brittle gasket. Proper maintenance

d c th h t

properly mixed sealant. Filters and gaskets

hd y ctd d cd

cy.

Ensure that there is no contamination of

t ct. st t t c

ctct th chy th

equipment. Pumps must be checked for

tht d hd t d th

t.

wh t ch

Dow Corning 3522 C st

Ccttd c th

, th t t cty

cd t th t t d

ctt th t th t. a

gaskets must be compatible with the cleaningt.

Regularly maintain gaskets. Some gaskets,

cy th dct ctct t th t

ct, cd c tt h

c t d .

Deteriorated gaskets must be immediately

cd. p t y t

supplier gaskets and other components, which

ct d cdd th Dow Corning 993 Structural Glazing

sc st. Th t

hd d chd

replacement of gaskets. Please contact your


you need specic recommendations.


24/5224


Product Quality

Surface Preparation and Sealant

Application

Every structural glazing project requires a

dt d thh cd t tht

tt y cd t t

ct. Th cd hd

followed for every structural glazing application.

fth dct th c, dc cd cdd th t

ct.

1. Inspect tt d t t

. Th t d dct t

tt th t tht

ttd d d y Dow Corning. Th

substrates, i.e. aluminium proles, should

d cdt d t dd y

td th.

2. Clean tt cdd th

Dow Corning written approval for the project.

Jt c t y c, dy, dt

d t . mt ctt

th c y h d ct

t dh t tt.

3. Prime th c t c t d

y thDow Corning tt th

project.

4. Place the glass or panel to be glazed. Care

must be taken to not contaminate cleaned

c d y h dct.

i ctt cc, c t

cd.

5. Apply sealant into the SG joint cavity. The

joint must be completely lled with sealant.

by h th d t t th

joint in a continuous manner, air entrapment

c dd.

6. Tool or strike the sealant joint surface with a

t dc ch t. Th t

must be pushed into the joint with a tool.

Scooping excess sealant from the joint is notcct t. T h t

that the sealant wets out the joint surfaces

and completely lls the joint without air

tt.

7. Inspect the nished SG units. Determine

whether the entire SG joints have been properly

lled and tooled. Determine wether the SG

t td th cdt d

ct hth th t c y.e tht th cdd ty

ct tt d.


25/5225


Product Quality

Substrate Cleaning Procedure

The key to acceptable sealant adhesion is a clean

c. f cd t c

- d tt.

Non-Porous Substrates

n- tt ch d

t cd th t t

ct t.Dow Corning cdth t-cth c thd d t c

- t. Th t-cth c

thd dcd t th ct.

Dow Corning r-40 C cdd

t c - tt.

att t cdd. i t

th th Dow Corning r-40 C t

d, dty th ctd t d

completion of the SG Project Testing Form.

Dow Corning will test with your specic solvent

d. p t, d dtt t

cct c t.

Porous Substrates

p tt ch t, ,

t cct d d

cdd . Th tt

d t cy th

non-structural applications. For specic

cdt tt,

t th Dow Corning bd eWeatherproong Manual which is available at

.dc.c.

Solvent Consideration

Th t d th ct

cdd d c th

these products. You should always check with

th th tt t tht th

c cd d t ct

th ch tt.

Masking

If aesthetics are important, surface adjacent to

the SG joint can be protected by masking. Prior

to sealant installation, a masking tape can be

applied to the surface adjacent to the joint. Test

th t t t tht t c y

d d d t d th tt.

D ct th t, d t y th

tape to joint surfaces since residual adhesive from

t y h t dh. idty

t th t h d d td,

th t.

Two-cloth cleaning method

Th t-cth c thd

tch t c - c. Th

cth t c tt t

cdd cd d t ct

t cth. C, t, t, t-

cth t d. Th thd ct c th tt th t ttd

cth d y dy th t

c cth. f th cd dcd

in greater detail:

1. Thhy c c

d.

2. p tty c t t

a working container. A clear plastic, solvent-resistant, squeeze bottle works best for this

. D t y t dcty

th ct.

3. Wipe the joint surfaces with sufcient force

t dt d ctt.

4. idty dy th t t

c th tt th t c,

dy cth. Th cd cth t thtt th t h td.


26/5226


Product Quality

5. vy ct th cd cth t dt

ctt cty d.

i th cd cth dty, t th

t-cth c thd t th cd

cth c. f ch t

c, tt ch cth t c t

th cth. D t c th th dty

t th cth. f t t, c

d d dty cth ty.

Substrate Priming Procedure

Dow Corning 1200 os p cy

the primer recommended for structural glazing

ct. Th cd dc

h t y c th

Dow Corning 1200 OS Primer:

1. b , y tht thDow Corning 1200

os p th t ttd h . Th

primer should be stored below 25C in its

d ct. Th

should be clear and water-like in appearance.

If the primer is milky white in appearance, do

t th . rd cd

.

2. Joint surface must rst be clean and dry. The

t hd th

(4) h t th c t. i th

a greater time delay, joint surfaces must becd t .

3. p t t c,

dy ct. D t th 10

minute supply of primer into the working

ct. rc d tht th c

th ct dty t d

th . ec th

t thc t c

it to deteriorate and turn milky white in thect.

4. p t th

working container onto a clean, dry, lint-free

cloth and gently wipe a thin lm on all joint

c . ay y h

t t th c. o c

c dh t th t d

th tt. i t ch d,

powdery white lm will form on the substrate.

o t cct ctc d

hd td dty. od

c t cd d d

.

5. a th t dy t th t

evaporates. This typically takes from 5 to

30 t dd tt d

hdty.

6. ict th c dy d th

c . a d -porous surface will have a slight haze. If red

cd d, th d c

d c. pd c t

d th th t (4) h. ay

c d d t d th

h t cd d d

y t.


27/5227


Product Quality

Placing the Panel

The glass or panel can be placed once the proles

h cd d d cy.

Th c d cd hd

d t th t t th

or panel. Care must be taken to not contaminate

cd d d c tht t

d. f t c c dh .

Dow Corning cd th d- t t hd th

is concern about physical contact with the joint

c.

Site Glazing Considerations

mt th tt c d

cd dcd y t th t

glazing and factory glazing. Key considerations

for structural glazing on site include:

Sealant must be stored away from excessive

ht. e th t t hh

tt d c th t t

dd d c y.

An application temperature range of

+10C to +40C is recommended. At lower

temperatures, the substrate must be kept

cdt t. stt

temperatures in excess of +50C will

dy ct th c d dh th

t t th tt.

Because environmental conditions cannot be

controlled on a jobsite, joint surfaces must be

cd d d d th t

cd d d (1) h .

Temporary fasteners must be used to keep

the SG joint stable during cure of the sealant.

Dow Corning 895 requires 1 to 4 weeks

c. st c t

is inuenced by the SG joint geometry,

tt d hdty. Ty

t y y d c th

t h dd c d dh

A comprehensive quality control program

which includes the skin-over time, elastomeric

tt, dh tt, H-c tt d

deglaze test must be followed.

Dow Corning c t th dt

ch ty ct

for structural glazing on site.


28/5228


Product Quality

Sealant Application and Quality Control

Procedures

Sealant Application Procedure

Sealant should only be applied in SG joints

hch h cd d d y th

cdd cd. st t

d t c, dy, dt- d t-

surfaces and the joint surfaces must be primed ifcdd y Dow Corning for the specic

project. Sealant adhesion may be harmed by an

improperly cleaned or primed SG joint. Sealant

must also completely ll the SG joint. The

c th sg yt ddt

having appropriate structural bite. An underlled

SG joint may jeopardize the performance of the

sg yt.

Th cd dc th procedures to apply sealant:

1. ay t ct t

ct d t.

A positive pressure, adequate to ll the entire

joint, should be used. By pushing the bead

of sealant into the joint in a continuous

, tt c dd.

2. T th t th ht

skin forms on the sealant. This is typically

th 5 t 10 t.

3. ad th t t d ch

t d t. Dy t

cdd. D t c t c

th d t cty h t t th

joint causing the sealant to fully wet out the

sides of the joint.

4. If the surface adjacent to the SG joint has beenmasked, remove the masking at this time.

Sealant Cure Requirements

a c t hth -ct

t-ct t thc

t t c. i cd ct ccd

joint that is not exposed to atmospheric moisture,

t c t tt. st

dh y cc th t d

t c t t hyc t. p

that the tooled sealant joint is fully exposed to thet.

Site Glazing Cure Requirements

Temporary support of adjoining materials must

d d th c tct t

site glazing. The SG joint must be static during

c t t t th t t c

d d dh d tth.


Sealant typically requires 1 to 4 weeks or longerto fully cure depending on the joint geometry,

tt d t hdty.

Factory Glazing Cure Requirements


Sealant typically requires 1 to 4 weeks or longer

t c dct cty t. C

rate depends on joint geometry, temperature and

humidity. The structurally glazed units must not

be moved to the jobsite until the sealant has fully

cd d t c dttd thh ty

ct tt tht th t h chd

dh (100% ch ).


st c d ct th 3 t 4

h dd tt d hdty.

Th t y ch dh

(100% ch ) 1 t 3 dy. Th

structurally glazed units must not be moved

to the jobsite until the sealant has fully curedd t c dttd thh ty

ct tt tht th t h chd


29/5229


Product Quality

adhesion (100% cohesive failure). Verication of

t c d dh d thh th

dh d/ H-c tt. it

th ty th sg ct t

th tt cd th . Th

cd dcd t dt t

th t ct.

Reglazing Procedures

Glass breakage occurs during all phases of a

construction project and even long after the building

is completed. How a system will be reglazed is

an important design consideration. The specic

procedures will vary from project to project.

Following are general guidelines for reglazing.

Reglazing Due to Glass Breakage

Th cd tht

Dow Corning Silicone Structural Glazing Sealant

was originally used on the project and that the

cdt t th

ctct th . i th t

t , ctct yDow Corning

Construction Ofce.

1. ft dt tht th t t

dhd. a dh tt t

performed to conrm that the existing sealant

h ct dh (100% ch )

t th . i ct dh tchd, ctct y Dow Corning

Construction Ofce.

2. r t dd . Dd

th d, th y d

ctt d .

3. Cut away the silicone leaving a thin lm

(1 t 2 ) t th . Ct

th t t cy. ict th t d,

care must be taken to avoid damage to the nish

th tt d th t.

4. i hy d t d th

1 h t ctt th cd t, t

c th t c c

t cy. sc c t

y dh t cd c t,

d c t t

dh t c t. i th t

c t cd, th d

t t t ct th

t.

5. i th t t cty d

d t th , t c th

d. p y

d. p t th

Dow Corning approvals for the project.

6. C d th

tt th . rc th c

cy d t th . it tyt t th t

attached as the sealant cures. Mask the joint

cy.

7. Fill the SG joint with a fresh bead of sealant.

Tool the joint and remove the masking if

d. p t th t ct

cd dcd th ct.

Inspect the joints to ensure that they are

completely lled and properly tooled.

8. at th t h y cd, th ty

c y d. o-ct

sealant cure may take 1 to 4 weeks or longer

depending on the joint geometry, temperature

d hdty.

9. qty ct d dcd t

th t cty d.


30/5230


Product Quality

Some SG systems do not allow easy reglazing of

th dd . Th yt dd

t h th t ct t, cd

th , d d cd tth. i

ch tc, th t ct

guidelines for new factory glazing which is

dcd th ct.

In some instances, the structural joint cannot

ccd c th h t. wth

yt ch th h th ct

removed and the glass must be set in the eld,

it is acceptable to use the following reglazing

cd. p ct th y


to using this reglazing procedure.

1. r th dd d th

tt dcd t 1 thh 7

ct sc pt dst act.

2. ay t dcty t th . eh

sealant must be applied to comfortably overll

the SG joint once the glass is set on the frame.

Th t t th 10 t

t ct. Th t c

the sealant so it sufciently lls the joints

th tt . i

possible, the joint surface should be tooled.

Reglazing Due to System Failure

athh ct yt tct

glazed system is very rare, there are situations,

particularly with older SG technology or linked

t ty t ctd th th

tct c, h t sg d

must be replaced. Because these projects can

y c, ctct y

Dow Corning Tchc sc e d

th tt d h th

dt.


31/5231


Product Quality

Quality Control Test Procedures

General Considerations

qty Ct th t tt

elements of a successful structural glazing

project and is the primary responsibility of

th sg ct. Th ct th

hd y dtd d cty

d y th t . Th cd dcdt d th ct th

dt ch ty ct

. i th Dctt ct th

, Dow Corning d ty ct

hch y c th dt

ch ty ct y th

t .Dow Corning t y th

dt ch ty ct

program specically for your organization.

Dow Corning dt dct cty

and make recommendations for improvement if

cy. lt th ct t ctc

d sg dct ct.

Sealant Production Quality Control

D dct, dc ty ct hd

d Dow Corning 993 scStructural Glazing Sealant produced through the

t-ct d t. Th

tt cd h t th t

y d t th cct t. Th tt

d th cdd cy h

the following table:

Sealant Production

QC Test

Frequency of Test

After Each Pump

Start-Up

After Each

Container Change

Diagnostic

Investigation

g Tt rd1 rd1 rd

Buttery Test rd1 rd1 rd

s T Tt rd rd rd

m rt Tt nt rd nt rd rd

athh Dow Corning 993 Silicone Glazing

Sealant - Black is most commonly used, the

t ht, y ct

colors for special projects. In such cases,

performing tests such as the glass test and buttery

test will be more difcult. Please contact your


specic quality control recommendations for

y htDow Corning 993.

1 Either the glass test or buttery test must be performed at the scheduled frequency. It is not required that both

tt d.


32/5232


Product Quality

Glass Test

Th g Tt cd d t t

th Dow Corning 993 sc stct

Glazing Sealant. This test is performed each time

tt- d t th th c t

ct chd. Th

th tt t dt hth th t-

ct d t dty

th t d c t.

f tddDow Corning 993 Black, the sealant

base is white and the curing agent is black.

When properly mixed, the nished sealant is

uniform black, with no grey or white streaks.

i c th t dd

check valve, a clogged hose, a clogged mixer,

tc. r t tc h t

t . p ct th

y d t ct

tc d. i y, ht ctcd Dow Corning 993 sc stct

Glazing Sealant is being used, please contact

y Dow Corning Tchc sc e

cdt.

T th g Tt mthd, y d

t t c, c hch

ty 10 c 10 c. pc th

c, c t th c,

th t c tth. p t th d th . Th t

dchd t hd th y

inspected for grey or white streaks. The sealant

should appear completely uniform and black.

i t t, th tt

t ddt t cd thh

th ch. it th t t ,

t tc y d. i

ddt tc d, ctct

yDow Corning Tchc sc e.

Glass Test: Proper Mixing

Glass Test: Insufcient Mixing


33/5233


Product Quality

Buttery Test

The Buttery Test is a procedure that is similar

t th g Tt. Th tt d t ch

tt- d t th th c t

ct chd. Th th

tt t dt hth th t-ct

d t dty

th t d c t. f tdd

Dow Corning 993 Black, the sealant base is white

and the curing agent is black. When properly

mixed, the nished sealant is uniform black, with

no grey or white streaks. Improper mix can be

the result of a damaged check valve, a clogged

h, cd , tc. r t

tc h t t

. p ct th y d

t ct tc

d.

i y, ht ct cdDow Corning 993Silicone Structural Glazing Sealant is being used,

ctct y Dow Corning Tchc

sc e cdt.

f th cd

Buttery Test:

1. fd ht t, ht a4 h.

2. ay d t t th d th.

3. p th ht tth c

the sealant into a thin lm.

p th t d y ct th

t dct

Apply Sealant to

Folded Paper

Press Together

Insufcient Mixing

Proper Mixing


34/5234


Product Quality

Snap Time Test

oc th t thd

by the Glass Test and/or Buttery Test, a Snap

T Tt t d. Th tt

d ch t tt- d t

th th c t ct

chd. Th t tt h t dt

th t cct d hth th t

c y. md t hd

like a one-component sealant until the chemical

ct t th t d c

agent begins to take place. The sealant will in a

tt t t d t

h tc t.

Following is a procedure for the Snap Time Test:

1. f ct th d

Dow Corning 993 Silicone Structural Glazing

st.

2. Place a small stick or spatula into the sealant.

rcd th t.

Every few minutes, pull the stick out of the

t. D t t tt th t. a

th t c cd, th t

c ty. oc th t t chy

and snaps back once it is pulled, this is the snap

t. rcd th t.

Th s T Tt y dd

tt d hdty. Hh tt

d hh hdty c th t t

t. Cd tt d

hdty cdt th t. o

the following page is a gure which shows the

ct tt t. s t

y tt t tt dd

h th t ttd. a, th

t t t t t d th

t . Hhy t

cd dct th th

. Th t tt dtt t tht th t d c. i th

t d t c, th th tt

d.

Stick Inserted Before Snap Time

in Cup Snap Time


35/5235


Product Quality

Mixing Ratio Test

Th m rt Tt t tt tht d

yDow Corning dy tt. Th tt

t dt hth th t t th

cdd t 10 t 1 y ht. mt

t-ct c d ch

d t hch th

ratio to be checked. Following is a procedure to

perform the Mixing Ratio Test:

1. Pressure valves must be adjusted in such a

way that the pressure is equalized for both

ct.

2. Hd d c dth ch

tt th . o th 10

seconds or at least 3 strokes of both the base

d c t .

3. wh th t c, th ht th

c t. Th ht t t th t-

ct hd t 9 t 1 d 11

t 1.

it h th c Dow Corning tht

th tt t dy ty ct

tt. it tt th cc th

th th t th t. Th tt

thd y d dtc tt d

with the glass test or buttery test and the snap

tt, hd th tt

t . Dow Corning Tchc

sc e t t y

th cc th c

Dow Corning 993 Silicone Structural Glazing

st.

Typical Snap Time vs. Temperature for Dow Corning 993 Structural Glazing Sealant

Snap Time vs. Temperature for Dow Corning 993 Structural Glazing Sealant


36/5236


Product Quality

Adhesion and Cure Quality Control Tests

Th dh d c ty ct

tt ddy d tth th t

t dt hth y h cc

structural glazing project. Each test is valuable

t y d t cdd t

y ch ty ct .

Dy p dh tt cdd th

daily test to verify sealant adhesion. For anodized

tt, th t dh

t dcd t 15 t t

. H-c tt cdd

tt t y cd t t.

Deglazing is a procedure to verify proper sealant

dh, c d ty ct dct

t.

Dow Corning th dh d c

ty ct tt d y th t

t th cy cdd th

following chart:

Sealant Adhesion

and Cure QC Test

Frequency of Test

After Each Pump

Start-Up

After Each

Container Change

After Each Substrate

Change

p adh Tt

Dyrd rd rd

p adh Tt

wt

rd (y

anodized aluminium)

rd (y

anodized aluminium)

rd (y

anodized aluminium)

H-pc Ttatt t p

adh Ttrd1

att t p

adh Tt

H-pc Tt wt

att t p

adh Tt wt

(only for anodized

)

rd1 (y

anodized aluminium)

att t p

adh Tt wt

(only for anodized

)

Deglaze Testnt gy

rd2nt gy

rd2nt gy

rd2

1 H-pc tt t ch ct ch y t d yDow Corning c.2 Deglaze testing is a valuable test that should be included in every comprehensive quality control program.

Deglaze testing may be required for specic projects or if special warranties are requested.


37/5237


Product Quality

SEALANT

BONDBREAKER

TAPE

GLASS OR

ALUMINIUM

SUBSTRATE

SEALANT

BONDBREAKER

TAPE

GLASS OR

ALUMINIUM

SUBSTRATE

Peel Adhesion Test: Cohesive Failure Peel Adhesion Test: Adhesive Failure

Peel Adhesion Testsp dh tt th t ct dy tt

t y t dh t tt. Th

c tt hd d th dy

tt t y dh t t tt.

Th tt hd d tt t

hch th t ctd t h dh t

the following intervals:

After each pump start-up or after extended

breaks

After a change of the curing agent or base

ct

For each new lot of substrate

f dct th dh

test:

1. C d th tt cdd

yDow Corning.

2. pc c ythy ht d

breaker tape across the at surface.

3. ay d t d t t t

t ty 20 c , 1.5 c d

and 6 mm thick. At least 4 cm of the sealant

hd d th ythy ht

or bond breaker tape.

4. it et to ed a we eh halway wthn

the ody o the ealant. fo et eult, olventclean and pe the ceen to enue good

adheon to the we eh. i we eh not

avalale, elale eult can tll e acheved.

5. at t c, th 4 c t t

hch y th ythy ht. p

the sealant at a 180 angle. Peel back only 1

t 2 c t th d

c ddt tt.

6. i th t t th t d

y dd t th tt, th cd

ch . 100% ch

d c th dct tht th tth dh t th th tth

ch.

7. i th t th tt, th

dct 100% dh (

0% ch ).sc t dh

d t, t th tt t

ddt 24 h c. Ct t

100% ch chd. i dh

d t d ctd, ctct y

cDow Corning Construction Ofce

For anodized aluminium and when 100%

ch cdd dy cdt,

c th t tt d t

for 15 minutes at room temperature. Take out

th t th t d tt

tt cd. 100% ch

t cdt d. i dh d t

d ctd, ctct y c D

Corning Construction Ofce.


38/5238


Product Quality

f ddt cdt

for peel adhesion testing:

Peel adhesion tests must be run on production

th ct t tt

or prole.

The substrate should be cleaned exactly the

y th dct t cd.

The peel adhesion samples must be cured in

th tt d hdty tht th

dct t td.

Samples should be tested periodically,

1, 2, 3 dy c

Dow Corning 993. Tt c ccd c

th dh tt h dh

100% ch . fDow Corning 895,

dh tt hd d t 7dy t.

For the wet adhesion test required for the

adhesion on anodized aluminium substrate,

no specic reconditioning required before the

tt.

Local authorities may required specic and

additional testing procedure such as: Once

ch dh, dth tt t dy

t dy d tt th ch

.

Important: SG production units can only be

shipped to the jobsite once full adhesion has

been veried by successful peel adhesion tests

under dry and wet conditions (for anodized

aluminium). 100% cohesive failure required.


39/5239


Product Quality

H-piece Test

Th H-c tt th y tt d t

t t c t. Th tt hd

d c y ct

d c t. i ct chd,

H-piece test should be used to conrm that the

t c t cct. i

tc, Dow Corning y t H-

c tt t ch tyct th cd ch

adhesion and deglaze testing are performed at

t cy d c tdd

d t d t H-c tt.

Th H-c tt c d dy dh

ty ct tt t c th tt

cctd t , th tt th

cdd dy dh ty ct

tt.

ey t ct chd, H-c

tt hd dcd. s hd

d ct dct tt

(aluminium prole and glass, typically). The

tt hd cd d d th

dct t d.

Th tt hd td th

tt d hdty t th

ct dct t.

The rst H-piece sample should be tested when

production units are to be shipped to the jobsite.Th dh tt hd d t y

dh (100% ch ). f

dh tycy cc t 1 t 3 dy

c Dow Corning 993 and 1 to 4 weeks for

Dow Corning 895, depending on joint geometry,

tt d hdty. Dow Corning 895

t h dh d c th ct

dct t th t hd t

the jobsite. If properly cured, the sealant should

h tth 0.70 mp th 100%ch . i t t cct,

cd H-c ddt

tt.

wh dy t cct h

H-c tt d tt t p tt

for anodized aluminium, wet testing must also

td t 15 t t t

tt. f dh (100% ch

) d tth 0.70 mp t

chd dy d t cdt.

b dt h th d

H-piece sample:

Tt c d d

block which has been cut to allow a cavity to

be lled with sealant in the dimension shown.

The wooden block should be pre-treated with a

soap solution or parafn wax to provide a bond-

broken surface for the sealant. Alternatively, a

polyethylene bondbreaker tape can be appliedt th d c t ctct th t.

A polyethylene U-channel specically designed

th tt thd c d. T

H-c hd dcd y

12mm

50 mm

50mm

12 mm

Glass

Silicone

Glassor

Metal


40/5240


Product Quality

ct c t d d

dct. Tt hd td th

cdt th ct dct t.

o hd ttd t th t tht

production units are to be shipped to the jobsite.

sty, dh tt hd y

dh (100% ch ) t th

t.

H-c c ttd th th

tt thh th r

sc. a r sc td

th c t tt t c d

dh th ct c t.

The weight applied to the silicone joint is equalt th ht (w) th r sc t

t th t /. Th H-c

hd ttd t t. Th t tth

t t hd 0.70 mp.

Th cd t tth 12 *

50 * 0.7 = 420 n d t th tt c.

This strength corresponds to a load of 42 kg. If the

r sc dd t h / t 10,

weight of 4.2 kg should be applied to the plate (W).

Th d hd d

10 cd th dh

ch th H-c. i

rupture occurs, incrementally add 0.5 kg to the

c t th H-c t. rcd th d

t t d ct ch d

th tt .

i c c tdd, H-c tt

th Dow Corning 895 Dow Corning 993

hd t tth 0.70 mp

th 100% ch t ct dct

substrates. For anodized aluminium, samect t chd t th 15 t

t t tt. rt

H-c tt hd cdd ty

ct . a cy sg qty

Ct l cdd th Dctt

ct th .

R

W

R = W * b/a

a b

Roman Scale


41/5241


Product Quality

Deglaze Test

Deglazing is a method of quality inspection used

to conrm sealant adhesion, joint ll and quality

in actual SG production units. Deglazing includes

complete detachment of a structurally glazed

. oc th

d, th c t ctd

cure, mix, uniformity of ll, lack of bubbles or

tt d t tty, t y

sealant adhesion. Deglazing is very useful to

production personnel as a form of feedback on

th c. pdct hd

t d th ct.

icdd th Dctt ct th

manual is a deglaze inspection form. During

ct, th t hd

evaluated:

Measured dimension of the structural bite.Th tct t dtd

in the project review must be satised. An

underlled joint may affect the performance

th sg yt.

Measured dimension of the glueline

thickness.

Adhesion of the structural sealant to the

tt d . st t ch dh (100% ch ) t

tt.

Sealant uniformity of cure and sealant mix.

Lack of air entrapment and bubbles in the

t.

Any deciencies observed should be reported in

th sg qty Ct l.

Dow Corningd t th tt thd

tdd ty ct cd. nth

t d ctc tht hd ctd

ch ty ct .

For special warranties and certain projects,

Dow Corning y th cd th

ty ct .

Deglazing should be performed as a regular

ty ct cd dct

t. Th tt c d dy

y dct . addty, th tt

hd y d t h th

dd th d t

be replaced. When replacing the glass, a deglaze

ct c y d. g c

effectively removed using a knife or piano wire.

It is best to cut the sealant mid-way in the joint so

tht h t t th d t dh tt t d. a

dh tt, dcd th ,

c d th t.

f cdd cy

deglaze testing to be performed on a project:

1. First Deglaze 1 unit out of rst 10 units

ctd (1/10)

2. Second Deglaze 1 unit out of next 40 units

ctd (2/50)

3. Third Deglaze 1 unit out of next 50 units

ctd (3/100)

4. Through remainder of project, 1 unit of every

100 t ctd

f th tc, ctct y Dow Corning Tchc sc e.


42/5242


Product Quality

Documentation

Th t d

ty ct dctt th

project.Dow Corning d th

, ty ct tht c

used on their own or as a model for a customized

quality control manual. At completion of a project,

th ty ct t dd tDow Corning ty td.

Dow Corning recommends that project

dctt td t t th th

th ty. Th dct hd

t Dow Corning or local ofcials if

td.

a ch ty ct

SG project should include the following:

SG details that were reviewed and approved

yDow Corning

Dow Corning Project Checklist approval

tt()

Project substrate and materials descriptions

and specications

Dow Corning dh d ctty

tt()

In-house SG production and quality control

cd

Completed sealant production quality control

logs with glass test, buttery test, snap time

tt d t tt t

Completed sealant adhesion and cure quality

ct th dh tt dy d

wet conditions, H-piece test and deglaze test

t

Traceability documentation which allows each

dct t t cy ctd t

specic date, time and location of production.

a dct t t d tht

they can be specically linked to the quality

ct . Th t ch th

building should be marked on the elevation

drawing so that it can be easily identied if

d. Th tcty dctt ctc th t tht d t

be investigated on a project.

Dow Corning t y th dt

ch ty ct .

D pdct d qty Ct adt,

y ch ty ct

td.


43/5243


Product Quality

Production and Quality Control AuditDow Corning will audit the structural glazing

dct d ty ct t

y Dow Corning Structural Glazing

sc st. D th dt, th t

dct t, ty ct

cd d dctt td.

Dow Corning d cdt

t d th ct th th sg ct. f

th tt t tht

Dow Corning will be evaluating during an audit:

Production Facility Operations and Safety

Cleanliness of the production facility

Production facility temperature and humidity

Proper sealant storage and handling

Properly operating and well maintained

t d t

SG Design and material approved by

Dow Corning

Proper substrate handling

Compliance withDow Corning cddsealant application procedures: two-cloth

c thd, , t ct,

t, tc.

Storage and handling of production units

Compliance with reasonable safety procedures

including safe handling of ammable materials

d tct t

Quality Control

Compliance with Dow Corning t

production quality control procedures: glass

test or buttery test, snap time test, mix ratio

tt

Properly completed sealant production

ty ct

Compliance withDow Corning dh d

cure quality control procedures: peel adhesion

test, H-piece test, deglaze test

Properly completed adhesion and cure quality

ct

Traceability documentation in accordance

thDow Corning cdt

Commitment by management to train

d t ch

ty ct .


44/5244


Product Quality

Maintenance and Repair

Structural glazing systems which utilize

Dow Corning Structural Glazing Silicone

st d t tc.

Dow Corning c t hty

tc t t-t ht, t,

ozone, acid rain and other natural elements.

Dow Corning c t h d

ctct ct 40 y dt c t th d

t h h tt dc ddt

c hyc t. Th,

t d ctd tht th ct

c t d ht

-t c dd tht th

correct product has been specied and that the

t h d ccdc th

Dow Corning cdt.

pdc ct th t d tct

glazing system is recommended. Some local

t y dc ct y

ddt ty. Th tdd d

cy ct t tyc ct

frequency would be as follows:

1t ict - u ct th

tt

2d Inspection 1 to 2 years after installation

3d Inspection 5 years after installation

d y t 5 y ct

Method of inspection may consist of:

1. Visual inspection of structural glazing system

d tct c t. o y

dct t dh t

hyc ty ch.

2. Hand pressure on accessible sealant joints to

y t dh

3. u sg ct cd ch

dcd asTm itt stdd

C1394.

athh c t y d t

tc, c t y

subject to mechanical damage such as vandalism

or bird attack. Damaged areas can be repaired with

th c t. p ctct

Dow Corning th cdt.

sc t y h ch

c t cct

thc t, dt th

ctt. a ch c th t

c y . Th ch d t ct

th c th t. i ch c,

ctt c y d th th

t d d dtt. ad

hch cd d th t.

p ctct y Dow Corning Tchc

sc e th tc

d.


45/5245


Product Quality

European SG Project ChecklistA European SG Project Checklist must be

completed for each project. The European

SG Project Checklist can be accessed at

.dc.c. p ctct y

cDow Corning Construction Ofce for more

t.

Project Name and Location:

Project Start Datedd//yyyy

ettd Ct Dt

Project Description: s. m sgFacade:

SG System Type: 4 Sided 2 Sided SG System Manufacturer:

Technical Contact: Email:

Phone: Fax:

Architect: Consultant:

General Contractor: IG Manufacturer:

DC Sealant(s) used:

lt g Hht () shtt g Hht ()

lt g wdth () shtt g wdth ()

D wdd (p) Ddd st (Y/n)

oth ld (p)Slope Glazing Angle

from Horiziontal

sd g v g ltd g it g

Total Thickness of

ot p ()

Total Thickness of

i p ()

DC IG Sealant Used: 3362 3793 ig Jt D. ( )

Proles Exposed tootd T. (Y/n)

Max. Prole Temp. (C)

a Steel Prole?

Max. Glas Temp. (C)

Tt DProduction (C)

pd stct btD ()

pd gThickness (mm)

Proles Tested/Approvedby DC? (Y/N)

Document ID Number:

sg dt H b st w b st t DC (Y/n)

n/ stdd sg syt

Additional Comments:

993 756791 797895 oth


46/5246


Product Quality

SG Project Testing Submission

s t hd td thh

Dow Corning Coins hch c ccd

t .dc.c. p ctct y

c Dow Corning Construction Ofce for

t d cc. Th

information is required with each SG project

testing submission:

Project Name and

Location:

DC st() t

tested for this project:

C st()

Type (i.e. Anodized) s C lt n

Prole Description

Prole Description

Prole Description

mct Ty (.. Ctd) n/bd C

g Dct

g Dct

mct Dct n/bd C

oth stt

oth stt

mct Dct s n/bd

accy mt

accy mt

Description of sample type and size to be submitted to Dow Corning:

Aluminium or Steel Prole 4 c ty 20 c

Ctd, ed y ttd

3 c ty 20 c 15 c

accy mt (tct c,

gaskets, tapes, setting blocks, etc.)

2 c 2 th ty 10 c

s hd

t t th

address:

Dow Corning S. A. Parc Inustriel Zone C B-7180 Seneffe

Attention: Sealants Testing Lab [email protected]

993 895 791 797 756 oth


47/5247


Product Quality

Sealant Production Quality Control Log

Company Name & Location:

Project Name & Location:

Dispensing Pump Type & Location:

Dt TT. &

Hdty

C/a lt

n

b lt

n

g

Tt

s

T

Tt

m

rt

Tt

Tt


48/5248


Product Quality

Sealant Adhesion Quality Control Log (Peel Adhesion Test)




Cleaning Solvent: p

Substrates: Primer Lot Number:

Dt TT. &

Hdty

C/a lt

n

b lt

n

p adh Tt

(% Ch f)Tt

Dy 1

Dy wt

Dy 2

Dy wt

Dy 3

Dy wt


49/5249


Product Quality

Sealant Cure Quality Control Log (H-Piece Test & Elastomeric Test)




Cleaning Solvent: p

Substrates: Primer Lot Number:

Dt TTemp. &

Humidity

C/a lot

numerbse lot

numer

H-piece

Test Dry

H-piece

Test wetet-

c

Tt

Tt

mp %Cf mp %Cf


50/5250


Product Quality

Sealant Adhesion and Cure Quality Control Log (Deglaze Test)




Frame Description: Cleaning Solvent:

Primer: Primer Lot Number:

Base Lot Number: Curing Agent Lot Number:

Glass Description: Frame Number:

Sealant Application Date: Deglaze Test Date:

rt d ot:

Measured SG Bite (Glass): Measured SG Bite (Frame):

Measured Glueline Thickness:

Joint Fill:

Sealant Mix:

Air Entrapment or Bubbles:

Sealant Adhesion to Frame:

Sealant Adhesion to Glass or Panel:

Sealant Cure Uniformity:

Other Observations:


51/5251


52/52

Your Dow Corning Construction contact details:

Toll Free Numbers: All other countries:From Belgium 0800 80 522 For English +32 64 51 11 59

From France 0805 54 04 39 For French +32 64 51 11 59

From Germany 0800 52 50 258 For German +49 611 237503

From Italy 800 92 83 30 For Italian +32 64 51 11 73

From Spain 900 813161 For Spanish +32 64 51 11 66

From United Kingdom 0800 91 72 071 For Russian +7 495 725 43 19

Fax number rom all countries: +32 64 88 86 86

Your Dow Corning contact details (e-mails) :Technical inquiries: [email protected]

Marketing: [email protected]

Quality Bond : [email protected]

EHS inquiries : [email protected]

Reach inquiries: [email protected]

You

Silicone Structure Glassing Manual

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