Gylon Gasketing

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Hochwertigkeitnach TA-Luft

SDDEUTSCHLAND

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GYLON GasketingGarlock

ISO 9002-94

Cert. #001762

DIN EN ISO 9001

Zertifikat: 09 100 6466


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Garlock Over 110 Years of Competence

Garlock Sealing Technologies is one of the

leading sources world-wide for demanding

sealing technology with over 100 years of

experience.

Production and sales locations in all important

industrial nations form the foundations for the

economical one-stop-shopping approach, so

important to international customers today.

Garlock Sealing Technologies offer quality

and delivery related guarantees world-wide

for all products. Regional Garlock consultants

are available to discuss application-specific

issues.

For the European Market, the company

Garlock GmbH, Neuss, Germany provides

stocking, co-ordination and consulting services.

Ready-to-use gaskets are manufactured here

according to the customers specifications using

most modern waterjet cutters.

A service which saves the customer time and

money.

The world-wide successful GYLON gaskets are

being exclusively manufactured by Garlock.

Their excellent properties above all the com-

bination of the advantages offered by PTFE

combined with superior creep characteristics.

Individual, competent and experi-enced

The Garlock consultants give you the

reliability you need. Through compe-

tent recommendations which take in-

to account the specific requirements

of your company. Through the expe-

rience and the personal commitment

to come up with the best solution to

your sealing problem economically

and engineering wise.

We will be pleased to inform you

about your nearest Garlock consultant.

ISO 9000Garlock Sealing Technologies is certi-

fied at all its manufacturing locations

in accordance with ISO.

2


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The benefits of using GYLON

GYLON combines many excellentproperties:

Excellent chemical resistance

Resistant to cold flow

Usable at high pressure-temperature

combinations

High recovery

Temperature stability from -212C to

+260C

Excellent dimensional stability

under thermal stress

Good electrical insulation

Extremely resistant to wear and

abrasion as well as adverse

weather conditons

50

40

30

20

10

N/mm2

Hours

0 10 20 30 40 50 60 70 80 90 100

100 C175 C200 C250 C

Before

After

GYLON-Standard GYLON-Blue GYLON-Off-White conventional PTFE

A comparison of GYLON gasketing and conventional PTFE when compressed at 14 N/mm2

for 1 hour at a temperature of 260C.

Creep tests according to DIN 52913.

GYLON-Standard: 55 x 75 x 2 mm; initial compressive stress of 50 N/mm2.

3


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GYLON proved and successful

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Hochwertigkeit

nach TA-Luft

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GYLON Style 3500 and 3501 E Standard

Multi-purpose gaskets for the chemical and petrochemical

industries. Offers significant advantages over conventional

PTFE in higher pressure-temperature applications due to

excellent cold flow resistance.

GYLON Style 3504 Blue

Due to its inorganic microspheres, GYLON Blue is highly

compressible. This excellent gasketing material is especi-ally suited to glass lined, enamelled and plastic flanges

as well as other applications sensitive to bolt load.

GYLON Standard, Blue and Off-White now TVCertified: Quality Tested in high quality in accordancewith German Clean Air Regulations (TA-Luft)

A comprehensive test programme was run by the TV

Sddeutschland covering the following aspects:

Low leak rate of the seal under maximum operating

conditions. Proof of a leak rate 0.01mg/(s x m).

Checks on how assembly and maintenance is controlled

so as to ensure proper operation.

Confirming leaktightness of the materials also in

endurance tests.

Proof of adequately high mechanical properties for

corresponding temperatures.

Test on safety against bursting and blow-out (2.5 x PN).

Proof of a controlled and consistently high quality pro-

duction output by the manufacturer.

The analysis by the TV Sddeutschland on the GYLON

material for flat gaskets has yielded the results summari-

sed in the table above and it has been determined that

GYLON is, for the stated operating parameters and

when used in connection with flat flanges according to

DIN 2635 Form C, of high quality in accordance with thetesting programme of the Institute for Plastics in the sense

of TA-Luft (Clean Air Regulations).

Gasket type

GYLON StandardStyle 3501 E 30 from RT up to 250 40

GYLON Blue Style 3504 20 from RT up to 250 40

GYLON Off-White Style 3510 20 from RT up to 150 16

jVU(N/mm2)

Operatingtemperature

(C)

Operatingpressure

(bar)


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GYLON proved and successful

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GYLON Style 3510 Off-White

Of all types within the GYLON family,

GYLON Off-White is the most resi-

stant to chemical attack. It is therefore

especially well-suited for aggressive

media like hydrofluoric acid, causticpotash solution, aluminium fluoride

and electrolytic baths.

GYLON Style 3545

GYLON Style 3545 consists of a highly compressible outer layer of microcel-

lular PTFE and a rigid PTFE core (which reduces the cold flow and creep). The

two layers have been sintered together homogenously. These materials are

made of pure PTFE without any fillers. Style 3545 has a very soft surface

which is particularly suited to flanges with uneven surfaces and where low

bolt loads are required.

GYLON HP 3560

The combination of GYLON Standard with the advantages of creep resi-

stance, universal resistance to chemical attack and the integrated stainless

steel sheet, result in the best sealing properties and the utmost reliability.

GYLON HP 3560 was developed for chemical applications involving aggres-

sive media where safety against a blow-out is paramount, for example in the

case of pressure bursts. One application among many is in the pulp & paper

industry in connection with boiling apparatus where the gaskets are exposed

to pressure bursts at high pressures.


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Custom-made Gaskets

6

GYLON Endless Gaskets

Especially for cases where the required dimensions exceed those of our stock

gasket sheet, Garlock is capable of manufacturing endless gaskets using a

special welding method. The welded gaskets offer the same homogeneity

and sealing properties compared to the endless gaskets.

Large Gaskets in Segments

For economical reasons and in the case of less demanding requirements,

large flange gaskets consisting of several segments may be employed. The

ends of these segments are either button-holed or duck-tailed. At Garlock

such segment links can be produced using water cutting technology withattendant manufacturing accuracy, very close fitting joints and leakage pro-

perties hardly any inferior to those of the endless gaskets.

High-Pressure Water Cutting Technology

With water cutting machines it is possible to manufacture gaskets of any

shape and size which offer the following advantages: high dimensional accu-

racy, fast production of the desired shape of gasket without the need for

expensive cutting tools, single gaskets and small batches can be delivered

quickly and economically. The cutting tool used in this technology is a water

jet about 0.3 mm thick which impacts on the gasket material at a pressure of

up to 4000 bar and three times the speed of sound.

GYLON Gasket with stainless steel metallic insert

Dimensions in accordance with DIN EN 1514-1. GYLON gaskets with metallic

insert comply with the UVV Gases regulations (VGB611 of the employers

liability insurance association for the chemical industry as well as the AD

rulings B7 (Vd TV)). This means that even in the case of toxic and easily

flammable media, flanges need not be of the tongue and groove type.


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GYLON Approvals and Installation Recommendations

7

Approvals for GYLON

For special applications and requirements the materials

used for our gaskets have been subjected to special

tests. Detailed information on the tests outlined in the

following is available upon request.

Use in connection with gaseous and liquid oxygen

BAM approval for GYLON Style 3501 E, Style 3510

and Style 3504.

TV-Certification

Gylon Style 3501 E, Style 3504 and Style 3510 are TV

certified: high quality in accordance with German Clean

Air Regulations ("TA-Luft").

FDA

GYLON Standard, Blue and Off-White conforms to FDA

specifications.

Approvals for chlorine

GYLON Style 3500 and 3510 are recommended by the

Chlorine Institute Washington/USA for sealing of liquid

and gaseous chlorine.

US Department of Agriculture

The US Department of Agriculture has accepted GYLON

Style 3500 for all those cases where GYLON comes into

direct contact with meat or poultry.

Installation Recommendations forGYLON Gaskets

Only a few factors need to be consi-

dered when fitting gaskets in order

to ensure proper functioning of the

gasket. The gasket must be placed correctly

central on the sealing surface.

The sealing surface must be clean,

level and undamaged.

The surfaces of the gasket and the

flanges must not be treated with

grease or separating agents.

The bolts of the flange must be

tightened according to the diagram.

During the first tightening round,

the bolts must be tight-ened to 50%

of the final torque. During the

second round to 80% and the thirdround to 100%. In order to ensure a

perfect seal for the flange connec-

tion, the bolts should be checked

and re-tightened as appropriate

after 12 to 24 hours.

Review basic suitability of the gas-

ket used with respect to the entire

thermalmechanical and chemical

stresses during operation (tempera-

ture, pressure, medium etc.) and

also in consideration of the condi-

tions for which the flange connec-tion has been designed.

Check the dimensions of the gasket

(inside and outside diameter, thick-

ness) in consideration of the condi-

tions for which the flange connec-

tion has been designed or the

applicable flange and sealing

standards (nominal width, nominal

pressure).

Check the strength potential or the

torque data of the bolts with respect

to attaining the minimum force per

surface area required for the speci-

fic gaskets, which is above all

affected by the operating medium,

its state of aggregation, the opera-

ting pressure, the permissible leak

rate and the safety level of the

system.

Avoid exceeding the maximum

force per surface area specified for

the specific gaskets which is above

all influenced by the operating tem-

perature and the ratio between

width of the gasket and thickness

of the gasket.


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8

The specifications stated here have

been determined in the lab in accor-

dance with DIN or ASTM guidelines.

In practice, deviations may be expe-

rienced owing to differing operating

conditions.

* BAM approval for oxygen service

at 200 C and 25 bar.

** Operating temperature and pres-

sure loads, the maximum of which

may not be reached at the same

time. The P x T factor (pressure-tem-

perature factor) allows checking of

the actual operating data as to the

suitability of GYLON gaskets.

The value obtained by multiplying the

max. operating temperature (C) and

the max. operating pressure (bar)

must not exceed the value specified

for P x T max. Any pressure and tem-

perature combination which remains

below P x T max. is permissible.

GYLON Availability

GYLON-Standard, -Blue,-Off-White GasketsSheet-thickness with tolerances (mm):

0,4 (+0,13/-0,05) 0,8 (0,13) 1,0 (0,13) 1,6 (0,15) 2,0 (0,15)

3,0 (0,25) 3,2 (0,25)

4,8 (0,40) 6,4 (0,50)

Sheet-sizes (mm):

1500 x 1500 1500 x 2280

1780 x 1780

GYLON HP 35601.6 mm thick with perforated stainless

steel inserts

3.2 mm thick with two perforatedstainless steel inserts

Sheet size: 600 x 600 mm

GYLON Style 3545Thickness: 2.0, 3.0, 4.8 or 6.4 mm

Sheet size: 1500 x 1500 mm

GYLON gaskets are offered as

sheets or as ready-to-use gaskets.

Production capabilities to customer

specifications or as flange seal inaccordance with all common stan-

dards.

Technical Information

Temperature range

Pressure load

P x T, max.** thickness1 and 1,5 mm

3,0 mm

Compressive creep strength (DIN 52913)

150 C - 30 N/mm2

175 C - 50 N/mm2

Modulus at 100% Elongation (ASTM D 1708)

Compressibility (ASTM F 36)

Recovery (ASTM F 36)

Creep relaxation (ASTM F 38)

Tensile strength (ASTM D 1708)

Sealability (ASTM F 37 B) ASTM Fuel A:

Internal pressure = 0,7 bar, Gasket load= 7 N/mm2

Gas sealability (DIN 3535/6)

Leak rate (DIN 28090-2), 2,0

Density (DIN 28090-2)

GYLON StandardStyle 3501 E*

-210 to +260 C

83 bar

12000

8600

16

25

11 N/mm2

7-12%

40%

18%

14 N/mm2

0,1 ml/h

0,10 cm3/min

< 0,001 mg/(s x m)

2,19 g/cm3

GYLON StandardStyle 3500

-210 to +260 C

83 bar

12000

8600

16

25

11 N/mm2

7-12%

40%

18%

14 N/mm2

0,22 ml/h

0,25 cm3/min

< 0,001 mg/(s x m)

2,10 g/cm3

GYLON BlueStyle 3504*

-210 to +260 C

55 bar

12000

8600

15

10 N/mm2

25-45%

30%

40%

14 N/mm2

0,12 ml/h

0,15 cm3/min

< 0,001 mg/(s x m)

1,70 g/cm3

GYLON Off-WhiteStyle 3510

-210 to +260 C

83 bar

12000

8600

14

9 N/mm2

4-10%

40%

11%

14 N/mm2

0,04 ml/h

0,10 cm3/min

< 0,001 mg/(s x m)

2,80 g/cm3

GYLONStyle 3545

-210 to +260 C

83 bar

12000

8600

14

60-70%

15%

15%

0,15 ml/h

0,04 cm3/min

< 0,002 mg/(s x m)

GYLONStyle HP 3560

-210 to +260 C

172 bar

25000

15000

4-9%

45%

20%

34 N/mm2

0,02 ml/h

0,02 cm3/min


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Technical Information

9

All information and recommendati-ons provided in this catalogue isbased on many years of experience.Unknown factors may result in somerestrictions. Binding statements as tothe compatibility of our products are

thus only possible after conductingpractical experiments under the ope-rating conditions encountered in thecustomers system. Therefore, thedata provided in our catalogues area general guide only.

Gasketing characteristic according to theSheet of Instruction B7

Gasketing characteristic values according to DIN 28090 for the quality assurance and calculation of flanged connections

The values jVU are for gas and steam application.

For fluids lower values can be used (~ 20%).

kOx KD-values for fluid can be used 20% lower.

bD = effective gasket width.

The contact surface finish should be in-between Rt = 50-160 m

Gasketing characteristic according toDIN E 2505 Part 2

Maximum initial

compressive stressj

V0

DIN 28090-1 N/mm2

Maximum in-service

compressive stress jB0/200CN/mm2

Minimum

initial stress jVU/L0,1-40barDIN 28090-1 N/mm2

Compression modulus at room temperature KSW DIN 28090-2 %

Percentage creep relaxation at room temperature KRW DIN 28090-2 %

Compression modulus at elevated temperature WSW DIN 28090-2 %

Percentage creep relaxation at elevated temperature WRW DIN 28090-2 %

GYLON StandardStyle 3500

Style 3501 E

160

100

20

3,1

1,1

12

2,5

GYLON Off-WhiteStyle 3510

150

70

19

4,1

1,3

29

4,2

GYLON BlueStyle 3504

150

70

10

20

6,1

32

5,7

GYLONStyle 3545

140

70

17

GYLON StandardStyle 3500Style 3501 E

Gylon Off-WhiteStyle 3510

Gylon BlueStyle 3504

Thickness

hDmm

1,0-3,2

1,0-3,2

1,0-3,2

Gasket-typeInstallationCondition

jVU jVON/mm2 N/mm2

18 160

15 150

8 150

Operating ConditionC

20 100 200jBO; N/mm

2

160 120 100

150 85 70

150 85 70

bD

/hD

10

Remarks

TemperatureC

2020-250

2020-250

2020-250

kO x KDN/mm

18 x bD10 x bD

15 x bD10 x bD

8 x bD6 x bD

k1mm

1,3 x bD1,3 x bD

1,1 x bD1,1 x bD

1,1 x bD1,1 x bD


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GYLON Testing Report

10

The information given on the following pages

should put the user in a position to prove qua-

litatively, in discussions with the relevant safety

authority, e. g. TV for example, the quality of

the gaskets used. The diagrams provided in

the following summarise the results obtained

from a series of experiments using the material

GYLON Standard.

Given in the first diagram are the leak rates which are to

be expected as a function of surface pressure. These

tests were performed with nitrogen at an internal pressu-

re of 40 bar. The straight line of the characteristic was

created from points which were determined under both

load and no-load conditions. The surface pressure requi-

red to attain a flange connection which is leak tight in

accordance with the TA Air - (101 g/s x m corresp.

0.01mg/s x m) - equivalent to 17 MPa or 17 N/mm2. Since

the samples were tested in an assembly which is resistent

to bending, one is on the safe side when using the mate-

rial in flange connections. All leak data were determined

at a constant leak rate.

Presented in the second diagram is the determination of

j

BU at 200 C under the test conditions already detailed.In order to determine jBU at 200 C, a maximum leak

rate was fixed, the value of which was one order of

magnitude below the value specified by TA-Air. In the

case of a flange connection, the surface pressure may

drop for various reasons at certain points or along the

entire circumference (often because of flexing, running

out of true, incorrect assembly among others). The value

of jBU at 200 C represents a quantity which states how

low the surface pressure may get at a temperature of

200 C and an internal pressure of 40 bar using nitrogen

so as to maintain the required degree of leak tightness.


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GYLON Testing Report

11

In the face of strong compressive stress various PTFE

based materials have the tendency to change significantly;

they may for example creep strongly and suddenly,

break or fail in other ways. As depicted in the third dia-

gram, the material GYLON Standard subjected to the

tests does not change in its physical and structural pro-

perties even when exposed to a high compressive stress

of 135 N/mm2. The leak rates were in this case determi-

ned at an internal pressure of 60 bar using nitrogen.

When stressing the gasket, 3 leak rates were determined,

specifically at 5 N/mm2, 65 N/mm2 and 135 N/mm2.

Thereafter the stress on the sealing material was relieved

step by step at first to 65 and then 5 N/mm 2, whereby

again the leak rates were determined. In the case of

such high surface pressures, the GYLON Standard gas-

kets showed no sign of physical change or mechanical

failure. Even when relieved to 5 N/mm2, the leak rate

remained below the value demanded by TA-Air.Characteristic for this investigation and the GYLON

Standard gaskets is the unimpaired recovery capability

even after exposure to high surface pressures.

Shown in diagram 4 is the course of the recovery as a

function of the applied surface pressure exerted on thegasketing material. The course of this curve is quite unty-

pical for PTFE and clearly demonstrates that GYLON

gaskets are capable of sustaining a surface pressure of

140 N/mm2 without being damaged. Moreover, it is pos-

sible to derive from this curve that it is one of the primary

characteristics of the GYLON gaskets that their recovery

increases at increasing compressive stress.

Diagram 5 shows the results of a long term test on

GYLON Standard. This test was run for over 940 hours

at 200C. The leak rate remained below 0.1g/s x m.

These investigations which were performed by theFederal Material Research Laboratory provide theuser sound reasons for using the gaskets in accor-dance with TA-Air and in line with accident preventi-

on regulations thereby forming a solid base of datafor checking the flange connection.


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Technicaldetailssubjecttochangewithoutnotice.GP-GB4203/01

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