British Gypsum: The UK’s Top Manufacturer of Interior Lining … 12262F.pdf · 2017. 5. 11. ·...

Customer: British Gypsum Limited

BTC 12262F: of 37

The Building Test CentreBritish Gypsum LimitedEast LeakeLoughboroughLeics. LE12 6NPTel (0115) 945 1564Fax (0115) 945 1562email [email protected]

0296

Report Number BTC 12262F

A FIRE RESISTANCE TEST ON A 5m HIGH X 3m WIDEGYPROC SHAFTWALL SYSTEM INCORPORATING A 60mmMETAL STUD FRAMEWORK CLAD WITH A DOUBLE LAYEROF 12.5mm GYPROC FIRELINE, EXPOSED TO THE FIRE FROMTHE SHAFT SIDE. CONDUCTED IN ACCORDANCE WITHBS EN 1364-1:1999.

Test Date: 19th September 2002

www.btconline.co.uk

Customer: British Gypsum LimitedEast LeakeLoughboroughLeicestershireLE12 6HX

http://www.btconline.co.uk/


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A FIRE RESISTANCE TEST ON A 5m HIGH X 3m WIDE GYPROC SHAFTWALL SYSTEMINCORPORATING A 60mm METAL STUD FRAMEWORK CLAD WITH A DOUBLE LAYEROF 12.5mm GYPROC FIRELINE, EXPOSED TO THE FIRE FROM THE SHAFT SIDE.CONDUCTED IN ACCORDANCE WITH BS EN 1364-1:1999.

TABLE OF CONTENTS

FOREWORD___________________________________________________________________ 3

REPORT AUTHORISATION _____________________________________________________ 3

TEST CONSTRUCTION _________________________________________________________ 4

TEST MATERIALS _____________________________________________________________ 7Gyproc Boards ______________________________________________________________________ 7

Metal Components ___________________________________________________________________ 7

Fasteners ___________________________________________________________________________ 8

Jointing Material ____________________________________________________________________ 8

TEST PROCEDURE ____________________________________________________________ 9

TEST RESULTS ________________________________________________________________ 9

LIMITATIONS ________________________________________________________________ 10

TEST DATA __________________________________________________________________ 11Observations _______________________________________________________________________ 11

Furnace Temperature Graph _________________________________________________________ 15

Unexposed Face Temperature Graph___________________________________________________ 16

Pressure Graph_____________________________________________________________________ 17

Unexposed Face Thermocouple Layout _________________________________________________ 18

Exposed Face Board Layout __________________________________________________________ 19

Unexposed Face Standard Five Temperature Data _______________________________________ 20

Additional Unexposed Face Temperature Data___________________________________________ 23

Additional Internal Temperature Data _________________________________________________ 29

Specimen Lateral Deflection __________________________________________________________ 32

PHOTOGRAPHS ______________________________________________________________ 35


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FOREWORD

This test report details a fire resistance test conducted on a shaftwall partition system. The testsponsor was British Gypsum Limited.

The test specimen was installed by British Gypsum. The construction of the specimen took placeon the 13th September 2002. British Gypsum Limited designed and selected the materialscomprising the test specimen.

The test date was the 19th September 2002.

This report details the method of construction, the test conditions and the results obtainedwhen the specific element of construction described herein was tested following theprocedures outlined in EN 1363-1, and where appropriate EN 1363-2. Any significant deviationwith respect to size, constructional details, loads, stresses, edge or end conditions other thanthose allowed under the field of direct application in EN 1364-1 is not covered by this report.

Because of the nature of fire resistance testing and the consequent difficulty in quantifying theuncertainty of measurement of fire resistance, it is not possible to provide a stated degree ofaccuracy of the result.

REPORT AUTHORISATION

The Building Test Centre will not discuss the content of this report without written permissionfrom the test sponsor. The Building Test Centre retains ownership of the test report contentbut authorises the test sponsor to reproduce the report as necessary in its entirety only.

Report Author

Brian WillsonTest Report Writer

Authorised by

Eur Ing. Paul HowardBSc. (Hons.), CEng., MIOAHead of Laboratory


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TEST CONSTRUCTION

The specimen was constructed in a refractory concrete lined steel restraint frame having anopening of 5000mm high x 3000mm wide.

A continuous Glasroc FS FireStrip was applied to the centreline of a Gypframe 62mm Shaftwall Jchannel (62JC70). The channel was then fixed to the head of the restraint frame aperture using60mm Hilti Hus fixings at 300mm centres (long flange to exposed face).

Gypframe 62mm Shaftwall floor channel (62C50) was fixed to the base of the restraint frameaperture using 60mm Hilti-Hus fixings at 600mm centres.

Gypframe 60mm Shaftwall starter channel (60SC55) was fixed to the left hand side of therestraint frame aperture (viewed from the unexposed face) using Hilti-Hus fixings at 600mmcentres. The starter channel was cut short by 15mm to accommodate the designed deflection.

A 60mm Gypframe 60I70 stud (cut short by 15mm) was positioned between the head and basechannels adjacent to the right hand side of the restraint frame aperture (viewed from theunexposed face) but not fixed. A 50mm Rockwool Firebatt gasket was inserted between thechannel and the restraint frame. The stud was ‘tabbed’ to gain a height of 5m i.e. the flanges ofan ‘I’ stud were trimmed leaving a 200mm flat web extension which was then fixed to anadjoining ‘I’ stud with 4 Gypframe wafer head screws. The ‘Tab’ was positioned 3600mm fromthe base of the stud.

60mm Gypframe 60I70 studs (cut short by 15mm) were positioned between the head and basechannels at 600mm centres. The studs were ‘tabbed’ to gain height of 5m. ‘Tabs’ werepositioned 3600mm from the base of the studs.

One layer of 19mm Gyproc CoreBoard (also cut 15mm short at the head) was inserted intospaces between the studs. The Core board was secured in position with Gypframe G102retaining channel inserted into the spaces between the board and the stud flanges. HorizontalCoreBoard joints were 1500mm and 4500mm from the base.

Two 122mm Gyproc CoreBoard fire stops, comprising two layers of 19mm Gyproc CoreBoard600mm wide, were pushed fully up into the web of the head channel and fixed using two32mm Gyproc Drywall screws for each 600mm wide pair through the head channel flange.

122mm fire stops were fixed to Gypframe GA3 angle sections (inserted into the horizontal boardjoints) using three 32mm Gyproc Drywall screws per fire stop, plus beads of sealant top andbottom.


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Gyproc Sealant was applied in the angle formed by the restraint frame and the head channel onthe unexposed face.

An inner layer of 12.5mm Gyproc Fireline was fixed to the unexposed face to all framingmembers (except the head channel) at 300mm centres using 25mm Gyproc Drywall screws(horizontal joint was positioned 2000mm from the base).

An outer layer of 12.5mm Gyproc Fireline was fixed to the unexposed face to all framingmembers (except the head channel) at 300mm centres using 36mm Gyproc Drywall screws(horizontal joint was positioned 3000mm from the base). Gypframe GFS1 Fixing strap was usedto back the outer layer horizontal joint.

The outer layer board joints were finished with Gyproc joint tape and Gyproc joint filler. Allscrew heads were spotted with Gyproc joint filler.


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Figure 1. Cross-section through the partition.

The descriptions of individual components making up the test specimen were provided by thecustomer and were checked for accuracy wherever possible.

a) Single layer of 19mm Gyproc CoreBoard.

b) Gyproc Drywall screw.

c) Gypframe G102 retaining channel.

d) Gypframe 60I70 stud.

e) 19mm x 122mm Gyproc CoreBoard firestop.

f) Double layer of 12.5mm Gyproc Fireline.


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TEST MATERIALS

Gyproc Boards

(i) Nominally, 3000mm (long) x 598mm (wide) x 19mm (thick), Gyproc CoreBoardmanufactured and supplied by British Gypsum Limited ex Robertsbridge Works.

Measured surface density: 16.67 kg/m2.Measured thickness: 19.75 mm.Board identification numbers: 24 232 2 13:18Measured moisture content: 0.57%

(ii) Nominally, 3000mm (long) x 1200mm (wide) x 12.5mm (thick), Gyproc Fireline(T/E) manufactured and supplied by British Gypsum Limited ex East Leake Works.

Measured surface density: 9.8 kg/m2.Measured thickness: 12.74 mm.Board identification numbers: 16 156 2 02:33Measured moisture content: 0.68%

The surface density and board thickness were calculated using the actual weight and size of aselection of boards used in the test specimen. The moisture content of the board wasdetermined using samples dried to a constant weight in an oven at 40oC.

Metal Components

(i) Gypframe 62JC70 J Channel. Nominally 0.7mm thick, manufactured from galvanisedmild steel.

(ii) Gypframe 62C50 Channel. Nominally 0.5mm thick, manufactured from galvanised mildsteel using the “Ultrasteel” process.

(iii) Gypframe 60SC55 Starter Channel. Nominally 0.55mm thick, manufactured fromgalvanised mild steel.

(iv) Gypframe 60I70 Stud. Nominally 0.7mm thick, manufactured from galvanised mild steel.(v) Gypframe G102 Retaining Channel. Nominally 0.5mm thick, manufactured from

galvanised mild steel using the “Ultrasteel” process.(vi) Gypframe GA3 Steel Angle. Nominally 0.7mm thick, manufactured from galvanised mild

steel.(vii) Gypframe GFS1 Fixing Strap. Nominally 0.5mm thick, manufactured from galvanised

mild steel.

All metal components supplied by British Gypsum Limited.


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Fasteners

(i) 25mm Gyproc Drywall screws supplied by British Gypsum Limited.(ii) 32mm Gyproc Drywall screws supplied by British Gypsum Limited.(iii) 36mm Gyproc Drywall screws supplied by British Gypsum Limited.(iv) 60mm Hilti Hus fixings supplied by Hilti Limited.(v) 13mm Gypframe wafer head screws supplied by British Gypsum Limited.

Jointing Material

(i) Gyproc Joint Filler supplied by British Gypsum Limited.(ii) Gyproc Paper Tape supplied by British Gypsum Limited.


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TEST PROCEDURE

The test was conducted fully in accordance with BS EN 1364-1:1999. The specimen wassubjected to fire from one side, as specified in BS EN 1364-1:1999. The test specimen was notsymmetrical and should therefore be tested in both orientations. No performance can beclaimed for the partition system if installed with the corridor side exposed to the furnace,without a separate test being undertaken to substantiate this orientation.

The test procedure used was EN 1364-1 Issue 1.

The ambient temperature at the commencement of the test was 17oC.

The furnace pressure head was located at a height of 3 metres and the pressure wasmaintained at 1 ± 2 Pa positive with respect to the atmosphere, except during the first 5minutes of the test and at 20 minutes.

The test conditions did not meet the full requirements of BS EN 1363-1:1999 as the furnacelinings and test frame stiffness did not fully comply. The test centre is of the opinion thatthese deviations from the documented method will not unduly effect the result of the test.

TEST RESULTS

The requirements of the standard were satisfied for the following periods:

Integrity:

Insulation:

107 minutes (cotton pad)

107 minutes (sustained flaming)

94 minutes (Thermocouple No. 32 exceeded 180 deg C.)

The test was terminated at 110 minutes.


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LIMITATIONS

The results only relate to the behaviour of the specimen of the element of construction underthe particular conditions of test; they are not intended to be the sole criteria for assessing thepotential fire performance of the element in use nor do they reflect the actual behaviour infires.

The specification and interpretation of fire test methods are the subject of ongoingdevelopment and refinement. Changes in associated legislation may also occur. For thesereasons it is recommended that the relevance of test reports over 5 years old should beconsidered by the user. The laboratory that issued the report will be able to offer, on behalf ofthe legal owner, a review of the procedures adopted for a particular test to ensure that theyare consistent with current practices, and if required may endorse the test report.


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TEST DATA

Observations

Observers: Unexposed face R EvansExposed face M Fountain

Timehrs mins

Observations

Observations to be read in conjunction with figure 6.All observations refer to the exposed face unless otherwise stated.

0 Test Started

5 Charring of face paper and jointing materials.Slight buckling of metal studs.

10 Further charring of face paper and jointing materials.Lower horizontal joint open to approximately 2 – 3mm.

15 Lower horizontal joint open to approximately 3 – 4mm.

20 Lower horizontal joint open to approximately 5mm.

25 Lower horizontal joint open to approximately 6 – 7mm, 10mm max.

27 Unexposed faceRight hand stud (free end) buckled outwards, approximately 3500mm height.

29 Unexposed faceHorizontal joint tape coming away from left hand and centre boards.Crack in horizontal joint material adjacent to left hand vertical joint.Right hand stud, approximately 3500mm height, buckling increased causingboard surface to crack.

32 Lower horizontal joint open to approximately 10mm and increases to a maxof 20mm max towards left hand side (free end).Small amount of flaming into furnace at left hand side.A few small vertical cracks at top of lower boards.


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Timehrs mins

Observations


36 Unexposed faceCrack in horizontal joint material propagated along joint in both directions.

43 Unexposed faceCrack lengthened in horizontal joint material, open to approximately 4mm.

46 Lower horizontal joint open to a maximum of 30mm.

49 Unexposed faceHorizontal joint, smoke/steam emissions from crack in joint.Lower left hand board, screw heads pulled through field of board.

55 Unexposed faceLower centre board, screw heads pulled through field of board.

58 Unexposed faceHorizontal joint open to approximately 6mm.Lower left hand board, all screw heads pulled through field of board.

1 00 Lower boards, cracking in all the top corners, except the one at fixed end.

1 02 Horizontal joints 7/12, 8/13 and 9/14 have closed.

1 07 Unexposed faceScrew head discolouration at both vertical joints.

1 11 Unexposed faceHorizontal joint open approximately 10mm where jointing cracked.Lower centre board, from approximately 1500mm to 3000mm all screw headspulled through field of board.

1 24 Lower left hand board bowing into furnace.

1 30 Lower left hand board, crack from horizontal joint down centre of board.

1 31 All middle and lower boards, crazed.


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Timehrs mins

Observations


1 32 Unexposed faceLower left hand board, discolouration in field of board at approximately2000mm height.

1 33 Board 7 bowing into furnace.

1 34 Unexposed faceINSULATION FAILURE. The temperature rise of thermocouple No. 32 exceeded180oC.

1 36 Unexposed faceLower centre board, discolouration in field of board approximately 2500mmheight.Lower left hand and lower centre boards, glow visible through screw holes infield of board.

1 37 Board fall, board 7 broke across width and fell into furnace.

1 39 Board fall, lower part of board 6 approximately 600mm x 500mm (high)fallen, remainder of board slid down to lower horizontal joint.

1 41 Unexposed faceLower left hand and lower centre boards, discolouration spreading downfield of boards.

1 42 Board fall, boards 8,9,12 and 14 fallen.

1 45 Board fall, unexposed inner layer approximately mid-height and mid-width ofspecimen has fallen.

1 46 Unexposed faceLower left hand board, gap in field of board approximately 1500mm height.


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Timehrs mins

Observations


1 47 Unexposed faceINTEGRITY FAILURE. Lower left hand board, sustained flaming atapproximately 1750mm height.FURTHER INTEGRITY FAILURE. Cotton Pad applied at centre board horizontaljoint mid-span. The pad ignited.

1 48 Unexposed faceLeft and right hand vertical joints open approximately 3mm.

1 50 TEST TERMINATED.


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Furnace Temperature Graph

Mean Furnace Temp Specified Furnace Temp

Tem

pera

ture

°C

Time minutes

0

200

400

600

800

1000

1200

0 30 60 90 120

Figure 2. Furnace temperature graph


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Unexposed Face Temperature Graph

Mean St5 Temp Max Unexposed Temp

Tem

pera

ture

°C

Time minutes

0

100

200

300

400

500

0 30 60 90 120

Figure 3. Unexposed face temperature graph.


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Pressure Graph

Pres

sure

Pa

Time minutes

-5

-10

-15

-20

0

5

10

15

30 60 90 120

Figure 4. Pressure graph.


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Unexposed Face Thermocouple Layout

Figure 5. Unexposed face thermocouple layout.

32

Centre of stud at mid-height of specimen

15mm from horizontal 15mm from vertical joint

2928

15mm from horizontal joint at mid-width of specimen

Right StudLeft Stud

Internal Thermocouples at 3750mm height

3534

Exposed Face

Unexposed Face

Free end

3330 31

2423

22

2120

26 2725

Right Stud

37

Left Stud

36

Exposed Face

Unexposed Face

Internal Thermocouples at 2500mm height

100mm from free edge at mid-height of the specimen

Standard Five

15mm from vertical joint at mid-height of specimen

15mm down at mid-width of specimen15mm down and 15mm

in from vertical joint15mm down at centre of stud

15mm from fixed edge and at mid-height of the specimen

Standard FiveStandard Five

Standard FiveStandard Five


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Exposed Face Board Layout

Figure 6. Exposed face board layout.


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Unexposed Face Standard Five Temperature Data

Temperature Rise (oC)Time

(mins)Thermocouple

No. 20Thermocouple

No. 21Thermocouple

No. 22Thermocouple

No. 23Thermocouple

No. 240123456789

1011121314151617181920212223242526272829303132333435

-2000000012358

1013161922252830323436373940404142424243434343

0000000012358

1013172023262931333537383941414243434343434343

0000000012357

1013161922252830323436383940414242434344444545

0000000123468

1114172023262931343638404142434445454646474848

1000101122457

1012151821242729313435373840414243434344444545


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(mins)Thermocouple

No. 20Thermocouple

No. 21Thermocouple

No. 22Thermocouple

No. 23Thermocouple

No. 24363738394041424344454647484950515253545556575859606162636465666768697071727374

434445474849495050505051515152535353535353535252525252525252525252535353535454

444546484949495050505151525353545454545455555555555555555555555555555555555656

464748494949494950505051525253535454545455555555555555555555555454555555555556

495152525353545454545555555656565656565656565554525151505050505050505051535456

464848494949495050515152535354545555555656565656565656565656565656565656565757


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(mins)Thermocouple

No. 20Thermocouple

No. 21Thermocouple

No. 22Thermocouple

No. 23Thermocouple

No. 2475767778798081828384858687888990919293949596979899

100101102103104105106107108109110

555657585959595960616162626263636464656666686972757778808182848688919499

59616262626363646464656565666667686869707072757881848689919497

100103107114136

58596060606060616161616162636464656565666869717377808283858688919498

102108

586060616263636465666768697071727375798284868788909192949698

101104110123174259

59616261616262626364646566666768686970707171717376808487889091939698

104114

See figure 5 for thermocouple layout


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Additional Unexposed Face Temperature Data

Temperature Rise (ºC)Time

(mins)Thermocouple

No. 25Thermocouple

No. 26Thermocouple

No. 27Thermocouple

No. 28Thermocouple

No. 29Thermocouple

No. 300123456789

101112131415161718192021222324252627282930313233343536

011111122469

12161922252729313335373840414243444546464747474748

0-10-1000011233456789

111213151617182021232425272830323435

11111112358

1114161921242729323436383940424344454546464646464747

-------------------------------------

0000111123468

101315182023252628293132333434353636373737383839

-10-10001234579

121417202225272931323435363738383940404041414141


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(mins)Thermocouple

No. 25Thermocouple

No. 26Thermocouple

No. 27Thermocouple

No. 28Thermocouple

No. 29Thermocouple

No. 30373839404142434445464748495051525354555657585960616263646566676869707172737475

494950515152535354545555555656565656565656565656565656565656565656565655555656

373940414345454645464646454645464647464647474849494950515050515252515253545353

484848494950505151515252525353535353545454545353535353535353525252525251515151

---------------------------------------

394041424243434344444444444545464647484849505051525353545555555555565656575860

414242424344454646464647474747474747484849494949494950505050504950505050505050


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(mins)Thermocouple

No. 25Thermocouple

No. 26Thermocouple

No. 27Thermocouple

No. 28Thermocouple

No. 29Thermocouple

No. 30767778798081828384858687888990919293949596979899

100101102103104105106107108109110

5656575859596060616162626363646565666768697071727476788082848586878890

5353535352525252525252525251515151515151505049494949484848495052535556

5151515151515151515252525253535354545455555656565758585961626568727884

-----------------------------------

616363646565666667686970727375777880818384858687899093959799

105115133170230

5151515151515354555657575859606162646566676869707070707071727577798082

See figure 5 for thermocouple layout.

Thermocouple No. 28 was located on a screw head.


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Additional Unexposed Face Temperature Data (continued)

Time Temperature Rise (ºC)(mins) Thermocouple

No. 31Thermocouple

No. 32Thermocouple

No. 33

0123456789

101112131415161718192021222324252627282930313233343536

-3000111113469

121519222529323538414446485051535354555556575758

0-10000012479

13162024273135384144474950515253545556565555555555

0000000112468

111417202427293234363739404142424343444445454647


BTC 12262F: of 37


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No. 31Thermocouple

No. 32Thermocouple

No. 33

373839404142434445464748495051525354555657585960616263646566676869707172737475

595960616263646565656666666666666665656564636361595858575655545454555658596060

555656565756565656555554545454545454545555555556565657575858595960616263636465

484950515253535454555555565656565656565655565555555555555556565657586061626263


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No. 31Thermocouple

No. 32Thermocouple

No. 33

767778798081828384858687888990919293949596979899

100101102103104105106107108109110

6161626263636464656667697072757678798183848586878991939599

104110120137167213

66666768697173798589929497

100104109119139166189206219229238250270297326366425463475488486459

6363646465666666676869707274768184868889909293959799

102106111120136156174189206

See figure 5 for thermocouple layout.

Figures shown in red indicate insulation failure.


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Additional Internal Temperature Data

Actual Temperature (ºC)Time

At 3750mm height At 2500mm height(mins) Left Stud. Cold Flange.

Thermocouple No. 34Right Stud. Cold Flange.

Thermocouple No. 35Left Stud. Cold FlangeThermocouple No 36

Right Stud. Cold FlangeThermocouple No. 37

0123456789

10111213141516171819202122232425262728293031323334353637

191924324971859196

100103112121129138147155163169176180184189192196201205209214220226234242250258266274282

19214154687581859197

103111120128136145155163170177182186191196201206211216221226232239247255264272280288

192028385063769399

105112117125132140147154160166169172175177180183186190194200203210216225235245254263272

1920243241536781879298

106113120127134140145150153157161165169173178181184188192197204210219226234250270


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3839404142434445464748495051525354555657585960616263646566676869707172737475767778

290298306314322330338347356363370376381386392397403409415423432439446453458464469475481488495502508515521527533538543548553

295301309315322329337345352359365372379385391397403409415421428434441447452456460465470475480486493500507514522530538545552

280288296305315325335345355364373382390398405412418426434441448454459464468473479485491498505512520529537545554562570577585

282288297306311321337350368381389398406414423433442451459466473480487494500506513520526532540547558565577586596605613621628


BTC 12262F: of 37


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798081828384858687888990919293949596979899100101102103104105106107108109110

557562567571576580584588593597601605608612615620624628632640714771799817859896902908911909

--

5595665725785845895956006066126186246296346396446496556616666736837007221024

-------

592598605611617624630636641646651656661666671676681687695708855882889901903

-------

635613621628635642650658666672681659671678683690703721735776862881885900

--------

See figure 5 for the location of the thermocouples.

Thermocouple No. 34 did not work after 108 minutes.Thermocouple No. 35 did not work after 103 minutes.Thermocouple No. 36 did not work after 103 minutes.Thermocouple No. 37 did not work after 102 minutes.


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Specimen Lateral Deflection

Deflection (mm)Time(mins) Centrally On free end

012345678910111213141516171819202122232425262728293031323334353637383940

028.948.959.169.776.780.386.39195

98.3101.4104.4107.2110.1113.1116.2118.6121

123.3125.9128.1130.7133.6136.3139.1142.1145

147.9150.6153.3156.2159.3162.3165.3168.1170.1172.3174.4176.6178.7

09.7

23.935.246.252.654.961.467.372.577

80.584.387.891.695.799.2101.2103105

107.1108.9111

113.4115.8118.1120.5122.7124.9126.4127.8129

130.2130.9131.5132

132.4132.6132.7132.9133.3


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41424344454647484950515253545556575859606162636465666768697071727374757677787980818283

180.2180.1180.2

----------------------------------------

133.6134

134.4134.7134.9135135

135.1134.9134.7134.4134.2134.1133.9133.6133.4133.2132.8132.7132.4132.2132

131.8131.7131.5131.4131.2131

130.8130.7130.5130.4130.2130

---------


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84858687888990919293949596979899

100101102103104105106107108109110

---------------------------

---------------------------

The deflection was recorded at the approximate centre of the specimen and at mid-height onthe free edge.

Positive readings indicate deflection into the furnace.

Centre Deflection Transducer was not in contact with specimen after 43 minutes.

Free End Deflection Transducer was removed at 75 minutes.


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PHOTOGRAPHS

Photo 1. Exposed face prior to test.


BTC 12262F: of 37


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Photo 2. Unexposed face prior to test.


BTC 12262F: of 37


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Photo 3. View of unexposed face at Integrity Failure on 107 minutes.

British Gypsum: The UK’s Top Manufacturer of Interior Lining … 12262F.pdf · 2017. 5. 11. ·...

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Transcript of British Gypsum: The UK’s Top Manufacturer of Interior Lining … 12262F.pdf · 2017. 5. 11. ·...