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है”ह”ह

IS 4253-1 (2008): Cork Composition Sheets, Part 1: PlainCork Sheets [MED 30: Gaskets and Packing]

IS 4253 (Part 1) : 2008

1lflT 1 ~ cmqf ~

( 'ifi~ ,yry#erur )

Indian Standard

CORK COMPOSITION SHEETS - SPECIFICATIONPART 1 PLAIN CORK SHEETS

( Second Revision)

ICS 674.883

OBIS 2008

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

.: NEW DELHI 110002

November 2008 Price Group 3

Gasket and Packing Sectional Committee, MED 30

FOREWORD

This Indian Standard (Part I) (Second Revision) was adopted by the Bureau of Indian Standards, after thedraft finalized by the Gasket and Packing Sectional Committee had been approved by the MechanicalEngineering Division Council.

This standard was first issued in 1967 and subsequently revised in 1980. In this second revision Amendments,No. I and 2 have been incorporated. The clauses with regard to sampling, dimensions, compressibility andrecovery, and immersion test have been modified.

The composition of the Committee responsible for the formulation of this standard is given in Annex B.

For the purpose ofdeciding whether a particular requ irement ofthis standard is complied with, the final value,. observed or calculated, expressing the results of a test or analysis, shall be rounded off in accordance withIS 2 : 1960 'Rules for rounding off numerical values (revised) '. The number of sign ificant places retained inthe rounded off value should be the same as that of the specified value in this standard.

IS 4253 (Part I): 2008

Indian Standard

CORK COMPOSITION SHEETS - SPECIFICATIONPART 1 PLAIN CORK SHEETS

( Second Revision)

1 SCOPE

2 REFERENCES

3 GRADESAND MATERIALS

The cork sheets shall be graded as shown in Table Iand identified by the type of bonding.

3.1 The cork composition sheets shall bemanufactured from clean, soft grade, uniformly

• granulated cork free from hardboard, wood fldur, dustand other foreign material and thoroughly bonded

Passing through 1.00 mm IS Sieveand retained on 425-micron IS Sieve,

b) Medium : Passing through 2.00 mm IS Sieveand retained on 1.00 mm IS Sieve ,and

a) Fine

4 DIMENSIONS

c) Coarse : Passing through 3.35 mm IS Sieveand retained on 2.00 mm IS Sieve.

NOTE - For the Indian Standard sieve designationsand their equivalents according to BS. ASTM . Tyler.French and German Standards, see IS 460 (Part I) and

IS 460 (Part 2) .

4.1 The preferred thicknesses for cork compositionsheets shall be 0.8 rnrn, 1.6 mm, 2.0 mm, 2.5 mm,3.2mm,4.0mm,4.8 rnm, 6.3 mm, 8.0 mm, IOmm.12.7mm, 16.0 mm and 19 mm.

4.2 The permissible variation in thicknesses shallbe ± 10 percent for thicknesses above 1.6 mm and± 18 percent for thicknesses below 1.6 mm unlessotherwise agreed to between the manufacturer andthe purchaser.

4.3 The properties of cork composition sheets shallbe as given in Table I.

with protein or resin binding materials. It shall befree from cracks or pinholes and shall be capable ofbeing punched without cracking or tearing.

3.1.1 Unless a particu lar grain size is specified bythe purchaser, the size of the cork granules used shallbe that wh ich the manu facturer considers mostsuitable for the particular application . The granulesshall be classified as follows:

5 SAMPLING

When required by the purchaser, the gaskets shall

The sampling plan shall be as mutually agreed tobetween the manufacturer and the purchaser inrespect of tests to be conducted. In the absence ofsuch agreement the purchasers to follow samplingplan given in Annex A and may test the material forconformity at their works.

6 FUNGUS-PROOFING

Title

Specification of test sieves:

Wire cloth test sieves (thirdrevision)

Perforated plate test sieves (thirdrevision)

Sampling inspection procedures:Part I Attribute sampling plansindexed by acceptable qualitylevel (AQL) for lot-by-lot inspec­tion (third revision)

Specification for externalmicrometer (first revision)

Methods of test for vulcanizedrubbers: Part I Tensile stressstrain properties (secondrevision)

(Part 2): 1985

IS No.

460

(Part I) : 1985

2500(Part I) : 2000

1.1 This standard (Part I) specifies the requirementsand methods of test for cork composition in the formof single layer sheets for use in systems involvingpetroleum fuels, lubricating oils, etc, in automotiveapplications and general purposes.

1.2 Cork composition s heets covered in thisstandard are not applicable for use in food industry.

The following standards contain provisions, whichthrough reference in this text , constitute provisionsof this standard. At the time of publication theed itions indicated were valid . All standards aresubject to revision and parties to agreements basedon this standard are encouraged to investigate thepossibility of applying the most recent editions ofthe standards indicated below:

2967: 1983

3400(Part I): 1987

IS 4253 (Part I) : 2008

Table I Property ofCork Composition Sheets

(Clauses 3, 4.3,7.3.1,7.4.1,7.5 and7.6.1)

SI No. Property Protein Bond Type Resin Bond Type

A. A.r '\ r '\Grade Grade Grade Grade Grade Grade Grade Grade

P22 P27 P32 P38 R22 R27 R32 R38( I) (2) (3 ) (4) (5) (6) (7) (8) (9) (10)

i) Density. g/cm', Min 0.22 0.27 0.32 0.38 0.22 0.27 0.32 0.38

ii) Tensile strength, kPa", Min 300 500 650 800 350 500 650 800

iii) Compressibility at 700 30/50 30/50 25140 15130 30/50 30/50 25140 15/30kPa , percent

iv) Recovery, percent, Min 70 75 75 65 75 75 75 65

v) Dimensional change, 2.5 2.5 2.5 2.5 1.5 1.5 1.5 1.5Max. percent

Gaskets are suitable for GP OP A E GP GP GP GP(abbreviations)

" I kgflcm' = 98 .066 5 kPa.

NOTEGP - general purpose only,A - automotive industry, andE - light electrical and general automotive industries.

7 TESTS

7.1 Unless otherwise specified, all tests specimensshall be conditioned at 27 ± 2 °C and 65 ± 2 percentrelative humidity for 48 h before subjecting to tests .

7.2 Dimensions

be treated to provide complete protection againstmicrobiological attack by complete immersion in asuitable fungicide (such as a solution of p­nitrophenol or pentachlorophenol) for not less than2 min, followed by draining and drying.

Mass, in g

Volume, in em 3Density

be drawn from each of the cork composition sheetselected. The test pieces shall be taken from cornersand centre so that all the positions in the sheet arerepresented.

7.3.1 Test pieces, with length, width and th icknessmeasured, shall be conditioned in a humidity cabinetfor 48 h in an atmosphere of 65 ± 2 percentrelative humidity and temperature of 27 ± 2°C.These pieces shall then be kept in an oven at atemperature of50°C for 24 h and conditioned for 24 hat 27 ± 2°C and 65 ± 2 percent relative humidity. Thelength, width and thickness of the conditioned testpieces shall be measured and the residual shrinkage.if any, in each dimension shall be calculated as apercentage. The change in dimensions shall not bemore than the value specified in Table I .

7.4 Density

Test piece shall preferably be square or rectangularin shape and have an area of at least 100 em' , It shallbe weighed correct to 0.1 g and its dimensionsdetermined. The density is then calculated by:

0.10

0.15

0.20

Variationmm

Nominal Thicknessmm

The thickness shall be measured by a Grade 2micrometer having an anvil of not less than 10 mmdiameter (see IS 2967). The thickness shall be withinthe variation specified in 4.1 and maximumpermissible variation in thickness between any twopoints not more than 250 mm apart shall be as givenbelow:

Up to 2.0

Above 2.0 to 3.0

Above 3.0

7.3 Dimensional Stability

One test piece at least ofsize ISO mm x 150 mm shall

2

IS 4253 (Part l) : 2008

The valu es of co mpress ib ility and recovery shall notbe less than tho se specified in Table I for that grade.

I - /Compressibility. percent = _I__2 • 100

/ I

(b-c)Moisture content, percent = (b _ a) x 100

where

removed and after a period ofone minute the thicknessI

jof the test pieces under the original pre-load shall be

determined. The compressibility and recovery shall becalculated as under:

I . - I ,= - -'- - - • 100

I, - I :Reco very. perc ent

a = mass of the tared weighing bottle, in g;

b = mass of tared bottle with cork pieces, in g;and

c = mass of tared bottle with cork pieces afterheating, in g.

7.7 Flexibility

Test pieces 180 mm x 30 mm shall be cut from widelydifferent positions of the sample (if desired size is notobtainable, nearest approach to the size may be made) .After conditioning in an atmosphere of 65 ± 2 percentrelative humidity at 27 ± 2°C for48 h, the specimen shallbe bent through 180° round a mandrel of diameter asgiven below:

a) Up to and including 3.2 mm thickness .- 5times the th ickness of material, and

b) Above 3. 2 mm thickness - 7 times thethickness of material.

The specimen sha ll show no sign of cracking orbreakage.

7.8 Fluid Resistance Test

Samples ofpreferably not less than 255 mrn- in area shallbecompletely immersed by some suitable means in:

a) water for 3 h at 100°C, andb) 35 percent hydrochloric acid for 30 min.

On removal from fluids, the samples shall show nodisintegration or deterioration in case ofwater and aslight disintegration in case of 35 percenthydrochloric acid.

7.9 Moisture Content

Cork pieces of suitable size shall be taken andweighed in marked tared bottle. The bottle shall thenbe placed in an oven and heater at 105°C for I h. Thebottle is then taken out and weighed immediatelyand the moisture conlent calculated as follow s:

7.4.1 A cork compos ition sheet shall be consideredsatisfactory for the characteristic. density, if the valueobtained as in 7.3 is greater than the correspondingvalue given in Table J.

7.5 Tensile Strength

One test piece shall be cut from each corkcomposition sheet selected and tested for tensilestrength on a tensile testing machine. The piecesshall be cut with a die or other suitable means togive clean-out edges. The test piece shall be dumb­bell, shape and size shall be as per IS 3400 (Part I) .The rate oftraverse ofjaw shall be 300 ± 30 mm perminute. Load shall be applied and tensile strengthcalculated in kPa l l . Where the test specimen breaksat the chucks the readings shall be disregarded . Thevalue of tensile strength shall be not less than thatspecified in Table I for that grade.

7.6 Compressibility and Recovery

One test specimen sha ll be cut from each corkcomposition sheet selected. The test specimens shallhave an area of 650 mm! in the form of a circle andshall consist of single ply or a number ofsuperimposed plies sufficient to give a minimumthickness of3.2 mm.

a) Anvil - A hardened and ground surface of31.7 mm, Min diameter.

b) Perpetrator - A steel cylinder of 28 .7 mmdiameter with its end hardened and ground. Itshall travel in its descent in such a mannerthat the surface shall remain parallel to thesurface of the platen.

c) Dial indicator - To show the thickness ofthe compressed specimen with an accuracy of0.002mm.

d) Pre-load - It shall include the weight ofpenetrator and added weight to give the loadof4.4N ± Ipercent.

e) Loading device - A device for applying thespecified major load to the upper end of thepenetrator. The device may consist of anarrangement ofdead weights, a hydraulic cylinderor any other means by which specified majorloads at a slow uniform rate and to an accuracyof± I percent. The majorload shall be440N.

7.6.1 The test piece or few plies oftest pieces, to makean overall thickness of about 32 mm shall be centeredupon the lower platen and pre-load applied andmaintained for 15 s and thickness II of the test piecesshall bemeasured. Immediately after, the major load shallbeapplied gradually so that the full load is obtained inlOs. This shall bemainta ined for a period of I min at theend of which the thickness 12 of the test pieces shall bedetermined. The major load shall then be immediately

" I kgf/cm' = 98.066 5 kPa .

3

IS 4253 (Part I): 2008

Depending on the use, the moisture content shall beas agreed to between the manufacturer and thepurchaser.

7.10 Determination of Water Soluble Matter

Test pieces ofsuitable small cut pieces shall be driedto a constant mass in a desiccator over fused granularcalcium chloride at normal temperature and pressure .These shall then be placed in a chemically-resistantglass flask and about 100 mI ofdistilled water added.The flask shall be fitted with a water-cooled refluxcondenser with a ground-glass connection and thewater heated to boiling point for I h. The test piecesshall then be carefully removed, rinsed with distilledwater, dried to constant mass in an air oven at 100 ±2°C, cooled in a desiccator and reweighed. The lossin mass of the test piece, calculated as a percentageof the original dry mass, shall be taken as apercentage ofwater soluble matter orig inally presentin the dried sample. The water soluble matter shallnot be more than 8 percent.

7.11 Immersion Test

Test pieces of size 25 mm x 50 mm of cork compositionsheets when floated in following test fluids underspecified conditions shall show no disintegration:

a) 24 hours at 120°C in oil having the following

characteristics:

Aniline point : 123.9"± 1°C

Kinematic viscosity: I9.5x I~ ± 2 x 10-6 m2/s

measuredat 99°C

Flash point : 244°C,Min

For the above test oil may be napthenic orparaffenic or aromatic.

4

b) 24 h at room temperature in 2, 2, 4-tri­methylpentane ( 70 percent isooctane, 30 percenttoluene).

8 MARKING

8.1 Cork composition sheets shall be markedindelibly with:

a) Manufacturer 's name or trade-mark (ifany),

b) Date of manufacture, and

c) Grade.

T ne marking of the grad es shall be such that it maybe readily ident ified on a piece of 300 mm x 300 mmcut from any position on sheet.

8.2 HIS Certification Marking

Cork composition sheets may also be marked withthe Standard Mark.

8.2.1 The use of Standard Mark is governed by theprovisions of the Bureau of Indian Standards Act,1986 and Rules and Regulations made thereunder.The details of conditions under which the licencefor the use of Standard Mark may be granted tomanufacturers or producers may be obtained fromthe Bureau of Indian Standards.

9 PACKING

Cork composition sheets shall be suitably packed toprevent damage .

10 STORAGE

Cork composition sheets shall not be stored underconditions of temperature , humidity or forunreasonable period oftime, which are likely to causedeterioration.

IS 4253 (Part I): 2008

ANNEXA(Clause 5)

SCALE OFSAMPLINGAND CRITERIA FOR CONFORMITY

A-I SCALE OF SAMPLING

A-I.I Lot

In any consignment, all the cork composition sheetsof the same dimensions and grade shall be groupedtogether to constitute a lot.

A-1.2 For ascertaining the conformity of the lot tothe requirements of this standard, tests shall becarried out from each lot separately. The number ofcork composition sheets to be selected at randomfor this purpose shall be according to Table 1 ofIS 2500 (Part 1). Inspection level, general and special,shall be as agreed between the manufacturer and thepurchaser.

It shall be ensured that lots containing 2.5 per centor less defectives will be accepted most of the timesfor dimensional requirements and no defective willbe accepted in case of other requirements.

A-1.2.1 To ensure the randomness of selection,random number tables as agreed between the buyerand the supplier shall be used. In case the tables arenot available, the following procedure may befollowed:

Starting from any item in the lot count all the itemsin one order as I, 2, 3 ... etc , up to r and so on,where 'r' is the integral part of Nln (N being the

number of items in the lot and n the number ofitems to be selected ). Every 'rth ' item thuscounted shall be withdrawn to constitute thesample.

A-1.2.2 If the cork composition sheets are packedin different packages, a suitable number of packages(not more than 20 percent of the total in the lot) shallbe selected at random and the required number ofcork composition sheets shall be drawn, as far aspossible , equally from the packages selected.

A-2 NUMBER OF TESTS AND CRITERIA FORCONFORMITY

After conforming dimensional requirements, anumber of cork composition sheets (as per specialinspection level) shall be subjected to the tests fordensity, tensile strength, compression and recovery,dimensional stability, immersion and water solublematter. All cork composition sheets in the samplesize (special inspection level) shall meet the otherrequirements of this specification for conforming ofthe lot.

The lot shall be declared conforming to therequirements of this standard, if it satisfies the aboverequirements.

ANNEXB(Foreword)

COMMITTEE COMPOSITION

Gasket and Packing Sectional Committee, MED 30

Organization

lIT Kiuuagpur, West Bengal

Banco Products (India) Ltd, Vadodara

Bharat Bijlee Ltd, Mumbai

Bharat Corrub Industries, Vadodara

5

Representattvets)

SHRI Am K. BANTllIA (Cltaimum)

SHRI V. K.GUPTA

SHRJ S. SELVAKUMAA (Alternate)

SHRJ R.S. Mt.JIW.EEDtIAIlASHRJ V. D. OEODHAR (Alternate)

SHRI B. M. TOUASHRI S . MOHAN (Alternate)

IS 4253 (Part I): 2008

Organization

Bharat Heavy Electricals Ltd, Tiruchirappalli

Crompton Greaves Ltd, Mumbai

Department of Industrial Policy & Promot ion. New Delhi

Fenner (India) Ltd, Madurai

Ferolite Jointings Ltd. Ghaziabad

Hindustan Petroleum Corporation Ltd. Visakhapatnam

Hyderabad Industries Ltd. Ballabgarb (Faridabad)

I.<iP. Engineers Pvt Ltd, Chennai

Kirloskar Oil Engines Ltd, Pune

Nu-Cork Products Pvt Ltd. Gurgaon

Ordnance Factory Board, Jabalpur

Research, Designs and Standards Organization. Lucknow

Rites Ltd, Gurgaon

Superlite Jointings Pvt Ltd. Ghaziabad

Super Waudite Jointing Pvt Ltd. Ahmedabad

Talbros Private Ltd, Faridabad

Tata Power Company Ltd. Mumbai

The Premier Automobiles Ltd, Mumbai

Uni Klinger Limited, Pune

Vietor Gaskets India Ltd. Nasik

BIS Directorate General

Member SecretarySHIll T. V.SINGH

Scientist 'E' (MED). BIS

6

Representativets)

SHRJ S. KUMARSHIll A. V. NARASINGA RAO (Alternate)

SHIll P. S. RAMAOIANDRAN

SHRJ SHAJSH KUMARSHRI M. Z. KHAN (Alremate)

SttIuV.SluNlvASANSttIuR. P. D. R. Boss (Altentale)

Stuu AKsHAv SHARMASHRI F. C. SHARMA (Alternate)

SHRI Y.SRIRAMULUSHRJ S. CHAKRAOHAR (Alternate)

SHRI (DR) V. K. SINGHSHRJ ARUN ISSAR (Alternate)

SHRlG.GANESANSHRJ A. V. PARTHASARTlfY (Altematei

SHRI A. D. DANISHRI R. L. HAROLIKAR (Alternate)

SHRIS. K. DAlTA

SHIll RAn-IiSH LooWALSHRJ M. K. MISHRA (Alternate )

SHRJ A. K. MANOALSHRI I. S. DAS (AIternate)

SHRI S. B. MALIKSHRI D. K. SINGH (Alternate)

SHRI S. K. DAVESHRI MADHUKAR SINGH (Alternate)

SHRI PRAOEEP 1.PANOVASHRI C. D. GAlOAR (Alternate)

SHIll BALRAJ TANWARSHRI PARVEEN SHARMA (Alternate]

SHJU A.sHoK SETHISHRI V. V. NAMJOSHI (Alternate)

SHRJ P. P. KlNISHRI BHARAT BHUSHAN (Alternate)

SHRI S. K. KAGAlKAR

SHIll M. S. SHANKARSHRJ DILIP PAlVE (Alternate)

SHIll C. K. VEDA. Scientist T & Head (MED)[Representing Director General (E.r-officio)]

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This IndianStandardhas been developedfromDoc:No. MED30 (0800).

Amendments Issued Since Publication

Amendment No. Date of Issue

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