Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 459 (1992): Corrugated and semi-Corrugated AsbestosCement Sheets - [CED 53: Cement Matrix Products]

IS 459: 1992(Reaffirmed 2003)

REAFFIRMED

2007

)

Indian Standard

CORRUGATED AND SEMI-CORRUGATEDASBESTOS CEMENT SHEETS - SPECIFICATION

( Third Revision)

Fourth Reprint DECEMBER 2006( Includmg Amendment No I & 2 )

UDC 691.328.5-415

© BIS 1992

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

March 1992 Price Group 3

IS ~59 I 1992

Cement and Concrete Sectional Committee, OED 2

C".;,,,,.DB H. C. VI8V.VABA'I'A

IlIpr,s,,,ti"IIn personal capacity ( Uni"ersi(1 ofRoo,k", R•.,k" 247 667)

B. G. Shirke at Co, Pune

Hyderabad Industries Limited. Hyderabad

Central Public Works Department, New Delhi

Gannon Dunkerley & Company Limited. Bombay

A. P. Engineeriag Research Laboratories, Hyderabad

Orissa Cement Limited. New DelhiThe Associated Cement Companies Ltd, Bombay

Central Building Research Institute ( CSIR ). Roorkee

Structural Engineering Research Centre ( CSIR ). GhaziabadThe India Cements Ltd. Madras

MIIdIr,SOl B. R.. Ba.BTIKAB

SUBI U. 1'1. RATSI ( Al'ma." )5••! H. BHATTAOHARYADB A. K. CBATTBRJBB

SBKI S. H. SUBBA.A~IAH ( ~1",,,tI', )CSIB:r ENGINBBR ( DESIGNS)

SUPEBI.TBNDI~GENOINBBB( 8&S ) (Alt""",,)

CBI." ENGIlUtBB, NAVAGAJI DAII Sardar Sarovar Narmada Nigam Ltd. GandhinagarSUPERINTBNDING ENGIN.SB. QCC ( .AI,,,,,.,, )

CHIBI' ENGINEER ( RESBABOH-OUK-DIBBCTOB) Irrigation and Power Research Institute. AmritsarRESBARCH OJ'J'ICIlB ( eoNORBTB-TBCB~OLOGY ) ( Al"ru,,)

DIRECTORJOIlfT DIBECTOB ( .AI",,,,,,, )

DIRBOTOR ( CMDD ) ( N & W ) Central Water Commission. New DelhiDEPUTY DIBECTOB ( CMDD) (N W & S )

( AI,,,,",,, )SBBI K. H. GANOWAL

SHill V. PATTABBI (~lt"ntlt')SSKI V. K. GRANBKARSSRI S. GOPJNATB

SURI R. TAKILAEABAB (AI,,,,..,,)SHBI S. K. GURA TUAKURT A

SBRIS.P.SA~XABANABAYANAN( .4lt"nGt,)

DB. IB8BAD MASOODDR MD KUALID (Alt,r".',)

JOINT DIRECTOR, STANDARDS ( B & S) ( CB-I ) Research, Designs & Standards Organization ( Ministry of Railways),Lucknow

JOINT DrRBcToR STANDARDS ( B &. S )( CB·I I ) ( .411""41' )

SSRI N. G. JOSHISSKI P. D. KELKAR (.4llmuzt, )

SURI D. K. KANUNGOSanr B. R. MEENA ( ,Alt"nat,)

SBRI P. KRJSHNAKURTBYSSRI S. CHAXRAVABTBY ( All",,,,,, )

SDBI G. K. MAJt1MDAIlSSRI S. O. RANGARI ( AI'''''(lI, )

SURI M, K. MOESERlB B

SURI M. K. GHOSH ( Alt""at, )SHRI P. N. ~hCHTA

~HRI J. S. SANGANERIA ( ~1',rNl" )MBJlBER SECRETARY

DIRECTOR ( CIVIL ) ( Jfl'"nat, )San i NIBJrfAL SUIOB

SDRI S. S. MIQLANI ( ~l"",." )SSRI R. C. PABATB

COL R. K. SINGH ( All',,,.,,)SSRI H. S. PASRICHASBBI Y. R. PaULL

SUBI S. S. SBBHRA ( AI"'NlI, )SHIU Y. R. PaULL

SBRI R. H. SHARMA ( Alt"ull )SUBI G. RAIIDAS

SBRI R. C. SHARMA ( AII""tI" )DR C. RA3KUKAB

DR S. C. AULUWALIA ( ~1,,,,,tJ" )DR M. RAKAI4H

DB. A. G. MADKA-VA aAO ( ~lt,rn(Jtl )RBPaBsBNTATIVBSBBI A. U. RI.lBltlNOHANI

SaRI C. S SHARMA (~ll""at')SHRIJ. SENGUPTA

S KBI A. K. LAL ( ~lt,,1ItIt' )SSRI T. M. SUBBA RAO

SaRI s. A. RBDDI ( AII,,,ud, )

Indian Hume Pipes Co Ltd. Bombay

National Test Houle, Calcutta

Larsen and Tourbo Limited, Bombay

HOlpital Services Coasultancy Corporation ( India) Ltd, New Delhi

Ministry of Transport. Department of Surface Traosport (RoadsWing ). New Delbi

Geological Survey of India, Calcutta

Central Board of l.-rigadoD and Power, New Delhi

Development Commissioner for Cement Industry ( MiDistry ofIndustry)

Engineer-in-Chief'. Branch, Army Headquarters

Hindustan Prefab Ltd. New DelhiCentral Road Research Institute ( CSIR ). New Delhi

Indian Roads Congress, New Delhi

Directorate General of Supplies and Disposals, New Delhi

National Council for Cement and Building Material., New Delhi

Structural Engineering Research Centre ( CSIR. ), Madras

Builders Association of India, BombayCement Corporation of India, New Delhi

National Buildiogl Organization, New Delhi

Gammon India Limited. Bombay

IS 459 I 1992

( Coni i1l1ud from pag' 5 )

M,mb"s Re/Jr,s,nlingSUPT ENGI••sa ( DB810118 ) Public Works Department, Government of Tamilnadu

EXECUTIVE ENGINBBR ( S. M. R. DIVISION)( Alt,rnat, )

SB1\1 S. B. SURI Central Soil and Materials Research Station, New DelhiSURI N. CSANDBASBKABAN (Alt"nat, )

DBH. C. VISVB8VARAYA The Institution of EDgineers ( India), CalcuttaSHRI D. C. CBATTt1RVBDI ( Alt"""t, )

SURI G. RAMAN Director General, BIS ( Ell·offieio M,mlJ" )Director ( Civil Eng. )

SecretarySBBIN.C. BANDYOPADBYAY

Joint Director ( Civil Engg ), BIS

Fibre Reinforced Cement Products Subcommittee, CED 2 : 3

EterDit Everest Ltd, Bombay

All Iadia Small Scale A. C. Pressure Pipe Manufacturer'. Associarion,Hyderabad

National Council for Cement and Building Materials, New Delhi

National Test House, CalcuttaDirectorate General of Technical Development, New Delhi

Directorate General of Supplies and Disposal•• New Delhi

Sbri Digvijay Cement Co Ltd, Bombay

Ramee Industries Ltd, MadrasSarbamangala Industries, Calcutta

The Hyderabad Indultries Ltd, Hyderabad

Geological Surveyor India, Calcutta

Central Building Research I nsntute ( CSIR ) t Roorkee

Municipal Corporation, DelhiNational Council for Cement and Building Materials, New DelhiDevelopment CommissioDer, Small Scale lodustrie., New Delhi

Kalani Asbestos Cement Pvt Ltd, Indore

Engineer-in-Chief's Branch, Army Headquarters

SHill H. R. OZ~ ( Alt,rn,,', )SSRI SRJ1CJVASAN N. IYXB

DR V. G. UPADHYAYA (Altt,ntJI, )JOINT DIRECTOR STANDARDS ( B & S )/CB.I Research, Designs & Stand. rds Organizatioo, Lucknow

JOINT DIRBCTOR ST.l'DAIlDS ( B 8t S )/CB·II ( AII,rna', )

SBRI P. S. KALANISHRI SAtTl\ABH K£LANI ( Alt',ntJl' )

DR KALYAN DA8SHRI K. D. DUARIYAL ( Alterna', )

LT-COL KAJlLESH PRAKASHLT-COL A. K. BANGIA ( AII,rnal' )

SUBI P. N. MBHTASHRI V. K. KA8LIWAL ( Alt"ntd, )

SBRI V. PATTABHISRRI A. K. GUPTA ( Alt,rna', )

SHRIS.PRAKASHDR N. RAOBA'9BNDBASHal RAJ KUIIAR

SHRI S. C. KUMAR ( Alt"""" )SHRIJ. 8SN GUPTA National Buildings OrganizatioD, New Delhi

ASSISTANT DIRECTOR ( PLASTIC) ( .41,,,,,,,,, )SVPTD SuaV.YOR 01' WOBKS ( CZ) Central Public Work. Department. New Delhi

SURVEYOR or WOBlI:S ( CZ ) ( AI,,,,,.,, )

Conven,rDB C. RAJKUJlAR

MlmbersSBRI S. K. BANBRJBBSSRI N. G. BASAlt

SHRI P. K. JAIM ( AII'rna', )SSRI S. N. BASU

SHRI T. N. USOVEJA ( AII"IUIl, )SHRl S. R. BHANDARI

SSRI D. N. SINGS ( Alt,rna', )SSln S. GANAPATBYSaar S. S. GOBNKA

SHRl I. P. GOENKA <AI'"ntd, )SaRI MOT\VANI GURBUX

6

AMENDMENT NO. 1 MAY 2002TO

IS 459: 1992 CORRUGATED ANDSEMI-CORRUGATED ASBESTOS CEMENT

SHEETS - SPECIFICATION( Third Revision)

( Page 1,clause2 ) - Insertthe following reference at theend :

'12269 : 1987 Specification for 53 gradeordinary Portland Cement'

( Page 1, clause3, line 10) - 'Insert 'or 53 gradeordinary Portland cementconforming to IS 12269 : 1987' after 'IS 8112: 1989'.

(CED53 )Printed at PrabhatOtlset Press, New Dellu-Z

AMENllMENT N(). 2 JUNI~ 2003TO

IS 459: 1992 CORRUGATED ANDSEMI·CORRUGATED ASBESTOS CEM~:NT

SHEETS -SPECIFICATION( Third Revision)

( Page 1,clause 2) - Insert the following at the appropriate place:

IS No. Tille

'3812 : 1981 Specification for fly ash for use as pozzoJana and admixture(first revision)'

( Page 1. clause 3) - Insert the following at the end:

'Fly ash. if used shall conform to IS 3812 : 1981. The corrugated andsemi-corrugated asbestos cement sheets may be reinforced With strips of suitablematerials; the material of stnps and details regarding reinforcing shall bemutually agreed to between the manufacturer and the purchaser.'

( Page 2, Table 1 ) - Insert the followmg note'

'NOTE - Corrugated sheets of overall width I OX() mm and effective width I 016 mmwith tolerances andother parameters sameas 10 tlus table I mayalso bemanufactured bymutual agreement between the manutacturcr and the purchaser ( veel-rg IA ) ,

( Page 3, Fig. 1 ) -Insert rig. 1 Aafter 'Fig. 1'.

~----- EFFECTIVE WIDTH (C)-----------lPITCH ~.(P)

....--------OVERAlL WIOTH(B)--------

FIG. lA CORRUGATED SHEET WITH FULL OVERLAP

(CED 53)Pnnted at Prahhat Offset Press, NewDelhl-2

AMENDMENT NO. 3 MAY 2009

TO

IS 459 : 1992 CORRUGATED AND SEMI-CORRUGATED

ASBESTOS CEMENT SHEETS ― SPECIFICATION

( Third Revision )

(Page 1, clause 2 (see also Amendment No. 2)] ― Substitute the following for the existing entry:

‘IS 3812 (Part 1) : 2003 Pulverized fuel ash ― Specification : Part 1 For use as pozzolana in

cement, cement mortar and concrete (second revision)’

[Page 1, clause 3, third sentence (see also Amedment No. 2)] ― Substitute ‘IS 3812 (Part 1)’ for ‘IS

3812 : 1981’.

(CED 53) Reprography Unit, BIS, New Delhi, India

Cement and Concrete Sectional Committee, CEO 2

FOREWORD

This Indian Standard ( Third Revilion ) wu adopted by the Bureau of Indian Standards, after the draftfinalized by the Cement and Concrete SectioDaI Committee had been approved by the Civil EngineeringDivision Council.

This standard was originally published in 1955 and subsequently revised in 1962 and 1970. The presentrevision has been taken up in the light of experience gained with the use of this standard. The majorchanges in this revision include deletion of acid resistance and water absorption test, and inclusion ofdensity test as an 0rtional requirement in line with the international practices. Impermeability telt basbeen made optiona in this revision. ID the composition of luch sheets, addition of some other suitable

_ fibres and poseolanic material have also been permitted.

In the formulation of this standard, due weightage bas also been given to the international coordinationamong the standards and practices in different countries in addition to relating it to the practices in thefield in this country.

For the purpose of deciding whether a particular requirement of thi!l standard is complied with, the finalvalue. observed or calculated, expressing the re-sult of a test shall be rounded off in accordance withIS 2: 1960 'Rules for rounding off numerical values ( rmstd )'. The number of significant places retainediD the rounded off value should be the same .. that of the specified value in this standard.

11458.1992

Indian Standard

CORRUGATED AND SEMI-CORRUGATEDASBESTOS CEMENT SHEETS - SPECIFICATION

( Third Revision)

1 SCOPE

This standard covers corrugated and semi-corm­gated asbestos cement sheets. designed to providestructural weather exposed surfaces of roofs andbuilding walls of industrial, residential, agricul­tural, commercial and institutional types ofbuildings and for decorative and other purposes.

2 REFERENCES

Portland pozzolana cement conforming to IS 1489( Parts 1 and 2 ) : 1991 or 43 grade ordinaryPortland cement conforming to IS 8112 : 1989.Pozzolanic materials, pigments and fillers whichare compatible with abestos cement may beadded.

NOTE - In cue of Portland pozzolana cement andPortland slag cement, addition of pozzolanic materialsshall Dot be permitted.

3 COMPOSITION

5.1.1 For the purpose of measuring the thickness,a dial thickness gauge having a flat anvil of notless than 9 mrn diameter accurate to measureo 1 mm shaH be used. The thickness measurementshall be made along the width on each end ofthe sheet. For corrugated sheets, measure at leastthree corrugations at each end of the sheet exclud..ing side laps ..For semi-corrugated sheets, measureat least three spots at each end of the sheet inwhich extreme flat portions shall be included.Thickness shall be measured at a distance notJess than 20 mm from the edge. Each individualmeasurement shall be not less than the minimumvalue specified in Table 1.

5.1.2 The depth of corrugation shall be measuredwith the help of a depth gauge as follows:

a) In the case of corrugated sheets, the depthof raeh of the six corrugations shall bemeasured on the smooth side and themaximum deviation in any of the casesmesured shall not exceed the limits speci­fied in Table 1.

4 COLOURING MATTER

5.1 The sheets shall conform to the dimensionsand tolerances given in Table 1 and Fig. 1 and ~.

5 DIMENSIONS AND TOLERANCES

f.1 Pigments which are embodied in asbestos forcolouring purposes shall be of permanent colourand shall conform to the relevant Indian Stand­ards. For guidance in ascertaining the colour andstaining power of the pigments see IS 591'3.: 1989.

4.2 The sheets may be left in their natural colour01' colouring matter may be added in the composi­tion. They may receive coloured or uncolouredcoatings on their surfaces,

Titl,

33 grade ordinary Portlandcement (fourth recision )

Portland slag cement (fourthr,vision )

Portland pozzolana cement:FJyash based

Calcined clay based

Methods of test for asbestoscement products (first revision)

Rapid hardening Portlandcement ( second "vision )

43 grade ordinary Portlandcement (first revision )

Guidelines for safe use ofproducts containing asbestos:Part 1 Asbestos cement pro­ducts

455 : 1989

8041 : 1990

8112: 1989

1489(Part 1 ) : 1991

( Pa rt 2 ) : 1991

5913 : 1989

The following Indian Standards are necessaryadjuncts to this standard:

IS No.

269 : 1989

11769( Part 1 ) : 1987

12081 Recommendations for pictorial( Part 2 ) : 1987 warning signs and precau­

tionary notice for asbestos andproducts containing asbestos:Part 2 Asbestos and its pro­ducts

The products shall be composed of an inertaggregate consisting of clean asbestos fibre,including other suitable fibres, cemented togethereither by 33 grade ordinary Portland cement con­forming to IS 269: 1989, rapid hardeningPortland cement conforming to IS 8041 : 1990,Portland slag cement conforming to IS 455 : 1989,

1

IS 459 11192

b) In the case of semi-corrugated sheets, thedepths of two central corrugations shall bemeasured on the rough side and the maxi­mum deviation in any of the two casesmeasured shall not exceed the limits speci­fied in Table I.

5.1.3 The pitch of corrugation shall be measuredas follows:

a) In the case of corrugated sheets, the totallength over six pitches shall be measuredand the length measured over these sixpitches shall not vary from six times thespecified pi tch by the tolerance given ( se«foot note in Table 1 ).

b) In the case of semi-corrugated sheets, thetotal length over three pitches shan bemeasured and the length measured overthese three pitches shall not vary fromthree times the specified pitch by thetolerances given (see foot note in Table I ).

6 PHYSICAL AND MECHANICALCHARACTERISTICS

6.1 Load Beariag Capacity

The load bearing capacity of corrugated andsemi-corrugated sheets shall be not less than5 N/mm width of specimen tested, when testedin accordance with IS 5913 : 1989.

6.2 ImpermeabiHt)' ( OptioDkl Telt )The specimens shall not show during 24 hours oftest any formation of drops of water except tractsof moisture on the lower surface, when tested inaccordance with IS 5913 : 1989.

6.3 Frost CraekiDI ( Optl08.1 Te.t )This test may be performed by mutual agreementbetween the purchaser and the manufacturer forsheets to be used in special situations likely to beaffected by frost. Visual examination of thespecimens when tested for frost cracking in accor­dance with IS 5913 : 1989, shall not show anycracking, surface alteration or delamination.

6.~ Density ( Optional Test )Density of the specimens shall be not less than1'40 g/cm3, when tested in accordance withIS 5913 : 1989.

7 GENERAL APPEARANCE AND FINISH7.1 The surface of the sheets intended to be ex­posed to the weather shall be generally of smoothfinish and the finish should permit any minorvariation of surface appearance due to method ofmanufacture which does not impair the strengthor performance of the sheets.

1.2 The finished products when delivered shallhave a rectangular shape. The corrugations shallbe true and regular. The edges of the sheets shallbe straight, clean and square.

Table 1 Dlme.Blo•• aDd Tolerances orCorrugated and Semi.ColTulated Sheets

( Clawes 5.1, 5.1.1, 5.1.2 and 5.1.3 )

All dim~D.ioD. in millimetres.

51No.

Type orSheet

Depth 01 Pitch 01Corrulatlon Corraptloa,...__Jt-__~ r---.A--~

D Tole. P Tole.ranee ranee!)

OverallWidth

,...._• ..Itt.._~

B Tole-rance

EfI'ectlveWidth,.._.A-......

C Tole-rance

NomlDalThlckae••r---~.~

T Tole-rance

Length ofShretl )

,...._Jt-_.~

A Tole·ranee

(1)

i)

ii)

(2)

Corrugated

Semi­corrugated

(3)

48

45

(4)

+3-5

+3-.5

(5)

146

338

(6) (7)

+ 6 1 050-2

+ 6 1 100- 2

(8) (9) (10)

+ 10 1 010 + 10- 5 - 5

+ 10 1014 + 10-5 -5

(11) (12) ( 13) (14)

6 + free 1 500 + 5- 0'5 1750 - 10

2000225025002 7503000

6 + erfle 1500 +5- 0·5 1750 - 10

200022502 5002 7503000

1) Tolerance given in tbis table (or pitch of corrugation relates to measurement over six pitches for corrugatedsheets and three pitches for semi-corrugated sheets.

2) Nominal lengths other than those specified in col 13 may also be manufactured by mutual agreement betweenthe manufacturer and purchaser.

2

IS t59 ~ 1992

Aa

FIG. 1 CORRUGATED SHBETS

Table 2 Sample Size

( Clause 8.1.2 )

Sample Sin

(2)3

57

10

Lot Size(1)

Up to 500501 to ) 000100 1 to 1 500

1 501 and above

8.2 Number of Test

1f.2.1 All the sheets selected as in 8.1.2 shall bemeasured for dimensions and examined for visualdefects,

8.2.2 On each selected sheet, the tests shall beperformed as indicated in 6.

under similar conditions of production shall begrouped together to constitute a lot.

8.1.1.1 The conformity of a lot to the require­ments of this specification shall be ascertained onthe basis of tests on the sheets selected from it.

8.1.2 The number of sheets to be selected atrandom from the lot shall be in accordance withTable 2.

--~

9.3 Load Bearial Capacity

From the test results of the characteristic, theaverage (X) and the range (R) (difference be­t ween the maximum and minimum test result )shall be calculated. The requirement of thecharacteristic shall be considered to have satisfiedif At - 0·2 R is greater than or equal to corres-ponding limit.

9 CRITERIA FOR CONFORMITY

10.1 The purchaser or his repl csentative shallhave access at all reasonable times to the manu­facturer's stock area for the purpose of inspectingthe materials and products, and selecting andtesting the sheets, which shall be so conducted asnot to interfere unnecessarily with the loading Inthe carriers.

9.1 The Jot shall be considered as conforming tothe requirements of the specification if the condi­tions given under 9.2 and 9.3 are satisfied.

9.2 DimeDlions, Visual Defects Impermea­bility, Frost CrackiDI aad Density

The selected sheets shall conformto the requl re­ments specified in 5 and 7. For impermeability,frost CJacking and density test the sheets shallconform to the requirements specified in 6.

10 INSPECTION AND MANUFACTURER'STEST CERTIFICATE

1

c ­

- 8

t--- --- - -- p - ­I

FIG. 2 SBMI-CORRUGATED SHEETS

8 SAMPLING AND NUMBER OF TESTS

8.1 Scale of Sampling

8.1.1 LotI n any consignment all the sheets of the sametype and of the same thickness and manufactured

IS 459 I 1992

10.2 The manufacturer shall, upon request, fur­nish the purchaser or his representative with acertificate that the finished products comply withthis specification in all respects.

11 TESTING FACILITIES

The manufacturer shall, in all cases and at hisown expense, supply labour and appliances forsuch tests as may be carried out in his premises inaccordance with this specification.

12 MARKING

Each sheet shall be indelibly stamped or marked

4

by any suitable method with the followinformation:

a) Indication of source of manufacture,

b) Year and date of manufacture, and

c) Pictorial warning signs as given in IS 12f( Part 2 ) : \987.

13 SAFETY RULES SHEET

All deliveries of asbestos cement sheets bymanufacturer shall be accompanied by safety rtsheet as given in IS 11769 ( Part I ) : 1987.

Bureau of ladl•• Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

Copyriaht

BIS has the copyright of all its publications. No part of these publications may be reproduced in any fonnwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relatingto copyright beaddressed to the Director (Publications), DIS.

Review of Indian Standards

Amendments are issued to standards as the need ariseson the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reatrmned when such review indicates that no changesareneeded; if the review indicates that changes are needed, it is taken up for revision. Usersof Indian Standardsshouldascertain that theyare in possession of the latestamendments or edition by referring to the latest issueof'BIS Catalogue' and 'Standards: Monthly Additions'.

This IndianStandardhas beendeveloped from Doc: No. CED2 ( 4166).

Amendments IssuedSince Publication

AmendNo. Dateof Issue

BUREAU OF INDIAN STANDARDS

Text Affected

Headquarters :

Manak Bhavan, 9 Bahadur ShahZafarMarg, NewDelhi 110002Telephones: 232301 31,2323 33 7S, 2323 9402

Telegrams : Manaksanstha(Commonto all offices)

Regional Offices:

Central : Manak Bhavan, 9 Bahadur ShahZafarMargNEWDELHI 110002

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: SeQ 33S-336, Sector34-A, CHANDIGARH 160022

Eastern

Northern

Southern

Westem

Branches:

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