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 3462 (1986): unbacked flexible PVC flooring [CED 5:Flooring, Wall Finishing and Roofing]

( Reaffirmed 2006 )

Gr 4

© Copyright 1986

IS : 3462 - 1986

Indian StandardSPECIFICATION FOR

UNBACKED FLEXIBLE PVC FLOORING

(Second Revision)

INDIAN STANDARDS INSTITUTIONMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG vr,

NEW DELHI 110002

0,: R. K. J.\IN ( Allnrant,)SDRI O. P. RATRASft ni J. K. K. SINO 11.-':'\1 .,

Indian StandardSPECIFICATION FOR

UNBACKED FLEXIBLE PVC FLOORING

( Second Revision )

Flooring and Plastering Sectional Committee, BDC 5

ChairmanS.na (J. P. MITT."' J.

S-252. Panchsila ParkKew Delhi

i\t""bns Rt/J,'s,,,'.nlSHRt S. K. UANERJEE National Test House, Calcutta

SHRf D. K. KASUNGU ( Al"rnat,)SURl DISJo:~H A. C1l0K8JII Areo}' Industries, Ahmadabad

SUitt MON _\1.. D. CJ10~SHI ( Alten..,, )SURf J. A. D'COSTA Indian In5tilute ofArchitects, Bombay

SJlIU S. 8. SHIROII ..\NY ( Alt,rruJl, Jl)~pu'rY DlRF..t Ton ( AR('H ) f\.linistry of Railways ( Railway Uoard )

DEPUTY DuuI:C:ToR ( nats ) I ( Alt","", )DIRJ~CTOIt Maharashtra Enlineering Research Insrirute, N••ik

RXSKARCH Oi'J'JCER ( AlterM" )Su n f K. V. G(!Jt{~8WA)lY Indian Oil Corporation Ltd, New Delhi

SHKI G. v, PANOAREAR ( AlI""at,)n« V. S. GUJlT.\ Fertilizer ( Planning & Development) India Ltd,

SindriBuro I). R. KATHURIA The IDSdtution of Engineen ( India ), CalcuttaSURf S. C. KAPOO't Modern Tiles & Marble, New Delhi

SHRJ A. C. KAPOOH ( Alt"n4t, )SIIR) K. E. S. MAS' Bhor Industries Ltd, Bomba)'

SUKJ R.~~I.:SB D. PAT~L ( Alte,,,41, )SURI M. V. Mt:RUOAPPAt' Coromaudel Prodorite Pvr Ltd, ~ladras

S uur R. Sn.INl\'.\SAN' ( Alt,m.t, )Dn MOM AN' R AI Central lluilding Research Institute (CSIR),

Roorkee

National Buildinls Organization, New Delhi~nlineer·in·Chief'sBranch (Minhtry of Defence ),

Army Headquarters, New Delhi~1.~.1 S. P. S".\utl.-' ( Al'"nal' )

( Continued on pag' 2 )

(S) C.JlYri,lti 1986INDIAN STANDARDS INS1"ITUTIOf\

Tbis publicatioa is protected under the Indian C'P-,",hl Ad (XI\-' of 1957) aDdreproduetioD in whole or in part by any mean!' escept with written pprmi.ioD or thepubli.ber .hall be deemed to be aD inrrintrement of coPyrilht under the aaid Act.

IS I 3462 • 1986

( C,ntinwd I''''' ~" 1 )

~\tltn6"1

SUPEnlS'f:F.NDlYG E~o]~};.:n

R,p,es,ntintPublic Works Department, Government or Tamil

Nadu, Madra.ExECUTIVE ENGINt~ER ( Alt,rnat, )

SPPP:RDfTJrNDINO SURVEYOlt or Central Public Works Department, New Delhi\VORKS ( CZ)

SUHVEYOR OF WORK,. ( CZ ) ( Alt,rtldt, )SRRI P. N. TAL\VAR Builder'. Association of India, BombaySHRI G. R.-\)lA~, Director General, lSI ( Ex-effrd. ~l/,m6" )

)>irector ( Civ Engl )

s.rttlJry

SURf A. K.:\VASTHYDeputy Director ( Civ Engl ), lSI

Linoleum, Rubber and PVC Subcommittee, BDC 5 : 3

CDnvtne,

n« S. P. ~IANIK Ministry of Railways, Lucknow

,,\/,m1J"J

SHRI A. Aiel. IBM World Trade Corporation, New DelhiSHRJ R. G. IV}o;NGAll ( AII"nat, )

SHRt M. BANJ:nJEE National Rubber Manufacturers Ltd, CalcuttaSHRI J. CHATTERJt:Z ( Alttrnat, )

S tI R.I G. R. IN"IID4ft Directorate General of Technical Development,New Delhi

SHRJ J. M. GARO ( Al',r1lG1. )SH H., J.D. J08 R I

SliRI A. T. MATIlYOOSaKI N. M. RAJUSHRJ B. RoySSRI M. G. VIRUASI

SHlU S. K. MALIK ( Alt" ..." )

Premier Automobiles Ltd, BombayRubber Board, "fravancoreHindustan Motors Ltd, HooghlyEast India Rubber Works Pvt Ltd, CalcuttaEngineer-in-Chief'. Branch ( Ministry of Defence ),

.-\rmy Headquarters, New Delhi

2

,\l\IENDl\·IENT NO. 1 MAY 1994TO

IS 3-162: 1986 SI)EClf'(CATION FOR UNBACKED~~LEXIBLE PVC FLOORING

( P.zgc/o, Tilbl.: I, Sf l\'O. {si), col 2 1- Add thl' tollowing:

(CEO.5 )...._------------kL·ph)~raph~ Una', HIS. New Delhi. India

IS : 3~62 • 19M

Indian StandardSPECIFICATION FOR

DNBACKED FLEXIBLE PVC FLOORING

( Second Revision J

e. ~'O R E W () R D

0.1 This Indian Standard ( Second Revision) \\'8S adopted by the IndianStandards Institution on 31 January 1986, after the draft finalized bythe Flooring and Plastering Sectional Committee .had been approved bythe Civil Engineering Division Council,

0.2 Flexible PVC flooring have been in use in the country for more thana decade. It provides dust free, noise absorbing resilient and decorativesurface for buildings of various types. The floor covering is availablein different shades and designs. -

0.2.1 There are two kinds of PVC floorings. One is flexible, which isavailable in sheet form and the other is rigid which is available instandard tile sizes. Flexible PVC flooring is suitable for comparatively1ighter traffic, either for rigid floors such as concrete and stone flooringor for flexible floors such as timber flooring, etc, Asbestos PVC flooringtiles are rigid, comparatively more suitable for heavy traffic and for rigidfloors. Flexible PVC flooring are not suitable for areas and surfacesexposed to sun and light.

0.2.2 PVC flexible flooring is liable to be charred by cigarette burns,leaving a permanent mark.

0.3 This standard was first published in 1966 and subsequently revisedin 1979. The important changes made in this revision are:

a) The clause for conditioning the samples has been included andthe conditioning of test specimens in water has been excluded.

b) Thickness of wearing layer of laminate type flooring has beenexcluded.

c) The requirements for tile size variation has been increased to0'13 from 0-10 percent with a maxim urn variation limited to0·40 mm,

3

IS t 3462· 198&

d) Requirements of colour fastness to daylight has been changedto standard No. 4 when tested in accordance with IS: 9766­1981*.

0.4 For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed or calculated,expressing the result of a test or analysis, shall be rounded off in accord­ance with IS : 2-1960t. The number of significant places retained in therounded off value should be the same as that of the specified value inthis standard.

1. SCOPE

1.1 This standard specifies requirements of unbacked homogeneousflexible PVC flooring, including laminated PVC flooring in which thecomposition of each of the laminate is substantially the same.

1.1.1 The flooring may be supplied in continuous lengths or in tileform.

2. DEnNITION

2.0 For the purpose of this standard, the following definition shallapply.

2.1 EI••tle Product - The product of the tensile strength ( expressedin MN/m2 ) and the elongation at break ( expressed by the increase inlength as a fraction of the original length ).

3. MATERIALS

3.1 The Aexible PVC flooring shall consist of a thoroughly blendedcomposition of thermoplastic binder, fillers and pigments. The thermo­plastic binder shall consist substantially of one or both of the following:

a) Vinyl chloride polymer, and

b) Vinyl chloride copolymer.

3.1.1 The polymeric material shall be compounded with suitableplasticizers and stabilizers.

4. CONDITIONING OF SAMPLES

4.1 Unless otherwise stated in the relevant ..Appendix, all the samplesshall be conditioned at a temperature of 27 ± 2°C in air for not less than60 minutes and tested at a temperature of 27 ± 2°C.

·Specification for flexible PVC compounds.tRuJ~~ fllr rounding off numerical values ~ "vised ).

IS I 3412 • 1111

5. DIMENSIONS AND TOLERANCES

5.1 Llaear Dlmell.ioD.

5.1.1 Slleel..s c Rolls - The standard width of flooring' sheets or rolls incontinuous lengths shall be 1 000 mm, 1 SeQ mm and 2 000 rom.

5.1.2 Tiles - The tiles shall be 250 rum, 300 mrn , 600 mm and 900 romsquare.

5.2 Thickne•• - The standard thickness of floor covering shall be1 5 rom, 2'0 mrn, 2·5 mm and 3 mrn,

5.3 Tolerances - The tolerance on the specified widths of sheets/rolls,tile sizes and thicknesses shall be as given in Table 1.

TA.BLE I REQ.UIREMENTS OF FLEXIBLE PVC FLOORING( Claus's 5.3, 5.4 and 7. t )

SL CIt.-\R.\CT-.:n!STIC R":QUJRE)IF::\'fx.,

ii) Width of sheet orroll

iii') 'rile size

iv\ Squareness ( fortiles only)

v) Dimensionalstability

vi, Colour (.ltnelS todaylight

( J) (2) (3,1

i, Thickness The mean rhicknese shall not differ bymore than 0·13 mm from that speci­fied. The variation between an ytwo measurements shall not exceed0-20 mrn

Width shaJJ be not leu thaD thatspecified and not more than 6 mmgreater than that specified

The dimensions shall not v.r)' fromthe specified dimension! by morethan 0·13 percent or ±O·. mmwhichever is less

Cap between the sides of the tiles andthe arms of the metal jig shall notbe greater than 0·15 rom towardsthe farther end from the junction ofthe arms

Change in any Iinear dimension shallnot exceed O· 4 percent Cor sheet and0-25 percent (or tiles. After the testthe specimen shall show no silOS ofcurling

Shall be rated not less than standard4 when tested in accordance with the4.3 of IS: 9766-1981t

5

~·IETliOD or TBST(RJo:F TO RELE­VANT CL OF IS :

3464·1986· )

(4)

3

3

3

5

( Contitlwd )

IS I 3462 • 1986

TABLE I REQUIREMENTS OF FLEXDLE PVC FLOORING - L'o"td

11

12

Appendix n

Appendix C

Appendix D

Appendix A

MBTHOD 0)1' l'EsT

( R EJ' TO RBJ~E·

v ANT CLA USE 0 ..IS : 3~4·1986· )

(4)

810

R EQ (; 1REMEN'J'

Shall not exceed 0·75 min

Shall not exceed 0·10 mm

Shall not break, crack or show anyother sign« of failure

The average scratch width obtainedafter immersion shal I not exceed2·0 mrn. The colour of the treatedpieces shall show no significantchange when compared with un­trea ted material

Adhesion between plies in any testpiece shall not be less than1·05 k~/m

Change in any linear dimensions sha llnot exceed 0'4 percent

No exudation or p last icizcr shall bt t

apparent nor shall there be anychange in appearance. The mandreltest shall not produce surface crack-ing

The mean product of tensile strengthand elongation shall be not less than2 ~tJ/ma

NOTJI; - This requirement i~ related to the situation of the use and the purchasershall specify the substances to which the PVC flooring materials shall have resistanceas rested by the method given in IS : 3464-1986-.

xi) Ply adhesion

xiv i Elastic product

SL Ca A KACTERJ8TIO

No.

(1) {2:

vii) Curling ( for tiles )

viii) Residual inden-ration

ix , Flexibility

XJ Resistance to vari-ous substances( SI' Note)

xii) Moisture move­rnent

"iii) Heat ageing andexudation

• Method of rest for plastic flooring and wall tiles ( Jtcond "I'iJion ).tSpecification for Rexible PV'C compounds.

5.4 Non-standard Sizes - The sheets or rolls and tiles may besupplied in sizes and thicknesses other than those mentioned in 5.1 and 5.2where agreed between the purchaser and the supplier but shall meet thesame requirements on tolerances as given in Table I.

6. COLOUR AND SURFACE CHARACTERISTICS

6.1 The flooring shall have a uniform wearing surface. The colour andalso the pattern, marbling or mottling, if present, shall extend throughthe full thickness of the flooring, when the flooring is not laminated.

6

IS 13462 -1_

In case of lammated flooring, it shall extend to the full thickness of thetop layer. The colour and the pattern shall match the sample that isagreed upon by the purchaser and the supplier.

No'n·: ...- In normal manufacture, Rooring from different batches may vary some­what in shade of the colour. A variation in marblinl or mottling is characteristicof the process,

7. REQ,UlREMENTS

7.1 The material when tested in accordance with the methods given inIS : 1464-1986. shall conform to the requirements specified in Table I.

8. TESTS

8.1 The tests shall be of three categories as given in 1.1.1 to 8.1.3.

8.1.1 Typt Tests - Tests carried out to prove conformity to therequirements of this standard. These tests are intended to check thegeneral qualities and design of the Hooring.

8.1.2 Acceptance Tests - Tests carried out on samples of flooring selec­ted from a lot for purposes of acceptance of the lot.

8.1.3 RoutineT'rsts - Tests carried out on each and every tile/roU/sheet(0 check the requirements which aloe likely to vary during production.

8.2 Cate,ories of Tests

8.2.1 Type T'ests - The following shall comprise the type tests( see 8.1.1 ):

a) Colour and finish,b) Dimensions and tolerances,c) Squareness,d) Dimensional stab ility,~) Colour fastness to daylight,f) Moisture movement,g) Curling,

h) Heat ageing and exudation,j) Residual indentation,k) Flex ibility ,

In) Resistance to various Sl1 hstances,

n) Ply adhesion, and

p) Elastic product.

• ~If'thod, of test for plastic flooring and wnll tiles ( s,tOfit/ "",;,;,,, ).

7

IS I 34&2 • 1986

8.2.2 Acc,pttme, Tests - The following shall comprise the acceptancetesta ( se« 8.1.2). Acceptance tests shall be made on samples selectedfrom each lot in accordance with the sampling procedure detailed inAppendix E.

a) Dimensions and tolerances,b) Squareness, andc) Dimensional stability.

8.2.3 Routin« Tests - The tests on colour and finish shall comprise theroutine tests to be carried out r.n each and every tile or roll or sheet.

9. MARKING

9.1 Each package of the sheet or roll shall be legibly and indeliblymarked with the following information:

a) Manufacturer's name or trade-mark, andb) Manufacturer's batch number and year of manufacture.

9.1.1 Tiles shall be legibly marked on the back with the name of themanufacturer or his trade-mark, manufacturer's batch number and yearof manufacture.

9.1.2 The package of sheet or 1'011 and the tiles may also be markedwith the lSI Certification Mark.

NOT. - The use of the lSI Certification ~1ark is governed bv the provisions of theIndian Standards Institution (Certification Marks , Act and the Rules and Reeu­lationslD.de thereund..r, The lSI Mark on products covered bv an Indian Standardconyer' th~ Ulurance that rhev have h~en produced to cornplv with Ib~ require­mf'nt. of that standard under a well-dt.lofiu,-d system of inspection, t~stinl aad quality~. ontrol which is devised and supervised by 151 and operated h~ th~ producer, lSImarked product. are also continuouslv checked by lSI for conformity to that.tandard as ~ further saferuard. Details of conditions under which il licenee for theuse of the lSI Certification Mark may be Irantt'd to manufaculrt"r, or processors,may be obtained from thfl' Indian Standards Institution.

APPENDIX A[ Table I, Item (ix) ]

METHOD OF TEST FOR FLEXIBILITY

A-I. OBJECT

A-I.I To determine the flexibility of P"C flexible flooring.

A·2. APPABATUS

A-2.1 A 40..mm diameter mandrel and a 10\\' temperature equipmentcapable of maintaining a temperature of 0 ± O·soC.

8

IS 13462.1111

A-3. PROCEDURE

A-3.1 The test piece shall be a strip of the flooring 50 mm wide and225 mm Jong. Six test pieces shall be tested cut at random from thesample. I n the case of tiles, test pieces from separate tilei shall be tested.Three test pieces shaIJ be cut with their 10Dg dimensions parallel to thegrain of the flooring and three with these dimensions at right angles tothe grain. Each test piece shall be conditioned at a temperature ofo ± O·soC for at least 60 minutes in air, immediately prior to testing.The rnandrel shall be cooled to the test temperature. The teat piece shallbe Lent by hand over the mandrel with the wearing surface outwards,through an arc of 180· in approxirnately three seconds.

A-4.REPORT

A-4.1 The bent portion of the test piece shall be examined in goodlighting and under magnification of X 4, and shall be reported for crack.breaks or other signs of failure.

APPENDIX B[ Table 1, Item (xii) ]

METHOD OF MEASURING MOISTURE MOVEMENT

B-I.OBJEcr

B-I.l To evaluate the percentage moisture movement of PVC flexibleflooring.

B-2. APPARATUS

8-2.1 Shallow Tray - Approximately 300 x 300 mrn, 50 mm in depthwith a layer of class balls, approximately 5 mm diameter, in the bottomand filled to a depth of 40 mm with distilled water, .

B-2.2 Steel Plate - 1~O m m square and 13 mrn thick, for keepingthe test specimen flat during measurement.

B-2.3 TraveiliDI Micro.cope

B-2.4 De.lee.tor - containing dry silica gel.

B-3. PROCEDURE

8-3.1 The test piece shall consist of a piece of the flooring not Jess than225 roms Two test pieces shall be tested. Test pieces shall beconditioned as given in 4.1.

9

IS, 3462 -1_

8-3.1.1 The test pieces shall be marked for the li imensional stabilitytest in accordance with 5 of IS: 3464-1986*. After maintainingat a temperature of 27 == 2°C in the desiccator for not less than 24 hours,the test pieces shaJJ be placed on a perfectly flat surface, with the steelplate on top of it, and the distance between each pair of marks to thenearest 0·01 rnrn shall be measured. The steel plate shall then beremoved and the test piece shall then be placed on the layer of glassbaJJs in the tray containing water ( J', Fig. 1 ) for 72 hours at 27 :J: 2°C.It shall be removed from the water and the distance between each pairof reference marks as previously described shall be rerneasured.

GLASS BAllS TEST PIECE

Flo. 1 ApPARATUS FOR MOISTURE MO\'EME~T

8-4. EXPRESSION OF RESULTS

B-4.1 The change in the distance between the' corresponding marks of apair shall be expressed as a percentage of the original distance. Theaverage value for the three pairs of marks in a direction shall be taken asthe moisture movement in that direction.

B-5. REPORT

B-5.1 The maximum value shall be reported.

APPENDIX C( Tahlt 1, Item (xiii) ]

MEASURING HEAT AGEING AND EXUDATION

C-l. OBJECT

C-l.l To determine the quality of P\'C flexible flooring after ageing andto alsell the flexibility.

• Methods of test for plast ic floorinl and wall tiles ( ",ol1d "uision \.

10

III 3462• 191&

C-2. APPARATVS

C-2.1 A circulating air oven capable of maintainipg a temperature of10 == 1°C and a 25 mm diameter mandrel.

C-3. PROCEDURE

C-3.1 The test specimen shall be a strip of the flooring 50 mrn wide and225 mm long. Three specimens cut from widely separated parts of theflooring shaJJ be taken and shall be maintained at a temperature of70 ± 1°C in the circulating air oven for 15 days. At the end of thistime the specimen shall be removed from the oven, and then allowed tocool. After a further period of 60 minutes at 21 ± 2°C the specimensshall be examined for exudation by lightly rubbing the wearing surfacewith a clean white filter paper. A greasy stain on the paper shows thatexudation has occurred and constitutes a failure of the test.

C-3.2 Having conditioned the specimens as specified in 4.1, they shaU bebent around the mandrel, with the wearing surface outwards, throughan arc of 1800 in approximately three seconds. The bent portion of thespecimen shall be examined in good lighting and under magnification of

.. ' 4 and shall be reported for crack., breaks or other signs of failurecaused by loss of flexibility.

APPENDIX D[ Tabl« 1, Item (xiv) ]

METHOD OF TEST FOR ELASTIC PRODUCT

0.1. OBJECT

D-1.1 To evaluate the product of tensile strength and elongation at breakof PVC flexible flooring.

0.2. APPARATUS

»-2.1 A constant rate of extension machine provided with a means ofobtaining the force applied to the specimen and the correspondingextension of the specimen at the breaking point. Under conditions ofuse, the force at break shall be within one percent of true value.

0.3. PROCEDURE

0.3.1 Each test piece shall be rectangular, 25 mm wide and at least75 mm long. Six pieces shall be cut from the sample, three with theirlonJt sides as nearly as possible parallel to the calendering axis and three

11

IS , 3f62 • 1'"

with their long' sides at right angles to this direction. The samples shallbe conditioned as given in t.l. The specimen shall then be mounted inthe tensile testing machine in axial alignment with the direction of pullin such a way that the unclamped part of the specimen between the gripsshall be 50 rom in length. The specimen shall be loaded by separatingthe grips at such a speed that the rate of extension of the specimen is100 percent pel' minute.

D·4. CALCULATION OF RESULTS

1).4.1 The tensile strength of the specimen shall be calculated from theforce to break and the original area of cross section and expressed inMN/m2• The elongation of the specimen at break shall be the increasein distance between the grips. The product of tensile strength andelongation for each piece shall be obtained and the mean of six deter­minations as the elastic product of the sample shall be reported.

APPENDIX E( Claus, 7.2.2 )

SAMPLING AND CRITERION FOR CONFORMITY FORACCEPTANCE TESTS

E-l. TILES

E-I.l Lot - All the tiles of the same type, size and manufactured fromthe same batch in one consignment shall constitute a lot.

£ ..1.2 SelectioD - The number of tiles to be selected at random fromthe lot shall depend upon the size of the Jot and shall be in accordancewith col 1 to 4 of Table 2.

£-1.2.1 The tile shall be selected at random from the lot, and in order toensure the randomness of selection, random nurnber tables (Stl IS : 4905­1968. ) may be used. In case random number rabies are not available,the following procedure may be adopted for the selection of tiles:

Starting from any tile in the lot. count them as I, 2, 3,...... , (r, and10 on in one order. Every rth tile thus counted rnay be selected tillthe requisite number of tiles for the sample is obtained, , being theintegral part of NI," where N is the number of tiles in the lot and nis the number of tiles to be selected in the samples,

E.l.3 Criteria Cor CODlormity - The number of tiles in the firstsample ( SI, col 2 and 3 of Table 2 ) shall be subjected to the acceptancetests ( SII 7.2.2). If in the first sample the number of defective tiles, that

• Method for random sampling.12

IS I 3462 • 1986

is, those failing to satisfy anyone or more of the acceptance telta II lessthan or equal to tbe corresponding acceptance number tJ (col 5 ofTable 2) the lot shall be considered as conforming to the requirementsof the acceptance tests. If the number of defective tiles in the firlt samplei~ more than or equal to the corresponding rejection number, (col 6 ofTable 2 ), the lot shall be considered as not conforming. If the numberof defective tiles in the first sample Ii~s between the corresponding valueof a and" a second sample ( see col 2 and 3 of Table 2 ) shall be selectedand subjected to the acceptance tests. If in the combined sample, thenumber of defective tiles is less than or equal to the correspondingacceptance number a, the lot shall be considered as conforming, and ifthe number of defective tiles is more than or equal to the correspondingrejecrion number " the lot shall be considered as not conforming.

TABLE 2 SAMPLE SIZE AND CRITERION PORCONFORMITY FOR TILES

( Clausts E-l.2 "lid E-I.3 )

No, 01" Trr.es SA~pr,l'; S'IfP'.~ CUMULATIVE ACCEPT.~J(CJ': RJtJECTJOS'I~ ''In·~ LOT SiZ\\. S.\MPLlt Sl;£S NUMBBR (a) NUMUER (,)

( I ) (2) (3) (4) (5) (6)

l.Jp 10 300 First 13 13 0 2Second \3 2«) I 2

301 to 500 First 20 20 0 2Second 20 40 1 2

501 to 1000 First 32 32 0 3Second 32 G4 3 4-

1001 to 3 000 First 50 50 I fSecond 50 100 4 5

3 001 and above Firat 80 80 2 5Second 80 160 6 7

E-2. ROLLS AND SHEETS

£-2.1 Lot - All the rolls or sheets of the same type, size andmanufactured from the same batch, in one consignment, shall constitutea lot.

E-2.2 SeleetloD - The number of rolls or sheets to be selected atrandom from the lot shall depend upon the size of the Jot and shall be inaccordance with col 1 and 2 of Tahle 3.

E-2.2.1 The rolls or sheets shall be selected at random from the lot,and in order to ensure the randomness of selection, random numbertables (se, IS: 4905..1968· ) may be used. In case random number

• 'Iethodi for random sampling.

13

IS I 3462· 19M

tables are not available, the following procedure may be adopted for theselection of rolls or sheets:

Starting from any roll or sheet in the lot, count them as 1, 2, 3, ... J',and 10 on in one order. Every rth roll or sheet thus counted maybeselected till the requisite number of rolls or sheets for the sampleis obtained, r being the integral part of Hill, where N is the numberof rolls or sheets in the lot and n is the number of roll. or sheets tobe selected in the sample.

TABLE 3 SAMPLE SIZE AND CRITERION FOR CONFORMITY FORROLLS AND SHEETS

( Claus's E-2.2auE-2.3 )

No. 01' Ror.t.s OR SHP.t;'fS

IN THE LOT

(I)

Up to 5051 to 150

151 to 300301 to 500501 to I 000

1 001 and above

No. OF ROLLS OR SnUTSTO BB SELECTED IN

SAMPLF1

(2)

358

J32032

PBnK.8SJDLB No. o.D."XOTIVE ROLLS

OR SSQT8

(3)

oooooI

£-2.3 C..lterla for Coalormlty - The number of rolls or sheetsselected in accordance witJa £-2.2 and E-2.2.1shall be subjected to allthe acceptance t«!lts (stl 7.2.2). If the number of defective rolls CJrsheets, that is, those failing to-satisfy anyone or more of the acceptancetests is less than or equal to the corresponding permissible number ofdefective rolls or sheets (col 3 of Table 3 ), the lot shall be consideredas conforming to the requirements of acceptance telt.. If the number ordefective rolls or sheets is more than the corresponding permissiblenumber of defectives, the lot shall be considered as not conforming.

14

,. r

1'.

'~lo ~:

,6: 67:.1a. '~ .

IHeadq"J4rtt":~ .M;mak BhavaJJ/9Bab~tShah Z.fa'M.rO;:NEVlfDEl"'~1l0Q(>,:2.,

Telephones: 331;.013\ :,'331,,1'316 -. ",~" Tel~'I~.~M.nak.an.;', .' ",' l , • ( tammon to Bli Offices )"" ,

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