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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

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“Invent a New India Using Knowledge”

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“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”

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“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 13683 (2006): Textiles - Ring spun grey cotton yarn,superior type [TXD 31: Man-Made Fibres, Cotton and theirProducts]

IS 13683:2006

Indian Standard

TEXTILES — RING SP~ GREY COTTON YARN —SPECIFICATION

(First Revision)

ICS 59.080.20; 61.020

!,

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IiI

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

PriceGroup 4

Man-made Fibres, Cotton and Their Products Sectional Committee,TX31

This Indian Standard (First Revision) was adopted by the Bureau d Indian Standards, after the draft finalized bythe Man-made Fibres, Cotton and Their Products Sectional Committee had been approved by the Textile DivisionCouncil.

This standard, was first published in 1993, as need was felt to formulate an Indian Standard on superior type ofcotton yam to cater to the demands from textile mills using high speed auto looms as well as shuttleless looms forproducing high quality fabrics. This revision has been taken up to incorporate the requirements of cotton yarnsbeing manufactured with the use of advance technology in spinning mills with emphasis on export market.

In this standard, the requirement of hairiness index has also been specified.

The composition of the Committee responsible for the preparation of this standard isgiven in Annex D.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in’accordance withIS 2:1960 ‘Rules for rounding off numerical values (revise@’. The number of significant plains retaimd in therounded off value should be the same as that of the specified value in this standard.

,,,

IS 13683:2006

Indian Standard

TEXTILES — MNG SP~ GWY COTTON YAW —SPECIFICATION

(First Revision)

1 SCOPE

1.1 This standard specifies requirements of ring spun(single and doubled) grey cotton yam for use in highspeed autolooms and shuttless looms.

1.2 This standard does not cover yam produced fromblends of co~on with man-made fibres or any otherfibre.

2 REFERENCES

The standards listed in Annex A contain provisionswhich through reference in this text, constituteprovisions of this standard. At the time of publication,the editions indicated were valid. All standards aresubject to revision and parties to agreements based onthis standard are encouraged to investigate thepossibility of applying the most recent edition ofstandard.

3 TERMINOLOGY

For the purpose of this standard the followingdefinitions shall apply.

3.1 Cotton Count (Ne) — The number of hanks (eachmeasuring 768 m or yd) in 453.6 g (or llb).

3.2 Count Lea Strength Product (CSP) — A numberobtained by the following relationship:

CSP = Breaking load ofa lea, in kg x cotton count(Ne) x 2.2046

3.3 Grey Cotton Yarn — Yarn as it leaves the spinningframe without any bleaching, dyeing or finishingtreatment and in case of open end yarn, it may havebeen waxed or not waxed.

3.4 Hairiness Index (~ — Total length of protrudingfibres in the yam in cm with reference to the sensinglength of 1 cm yam

3.5 Lea — A continuous length of yam measuring109.73 m (120 yd) in the form of a coil having 80 wrapswound on a reel of 1.37 m (1.5 yd) girth.

3.6 -Lea Breating Load — The breaking load of a leadetermined on a pendulum type testing machine, therate of traverse being 300 * 15 mm/min.

-3.7 Ring Spun Yarn — Yarn spun on a systememploying flat top cards and roller drafting assemblieswith or without aprons on drawing, roving and ringframes.

3.8 Single Yarn Tenacity — Tensile stress of a singlestrand at rupture expressed as force per unit lineardensity of the unstrained specimen expressed usuallyas cN/tex (gf/tex).

3.9 Tex — Number indicating the mass in grams of1 km of yarn; the relationship between the cotton countme) and the tex being as under:

Tex ==Ne

3.10 Two-Fold Yarn (Doubled Yarn) — A yarn inwhich two single yams are twisted together in one ortwo operations. . . ..

4 REQUIREMENTS

4.1 Single Yarn

The single grey cotton carded or combed yam shallcomply with the requirements given in Table 1 orTable 2 respectively. However the average count of yarnshall be as agreed to be~een the buyer and the sellerwith a tolerance of +3.0 percent permissible on thecount of yarn when determined as per the methodprescribed in 1S 1315.

4.1.1 Twist in Yarn

The twist in yarn shall be as agreed to between the buyerand the seller and average twist shall be within +10percent of the specified value.

NOTE — In direct system of yarn numbering twist factorcorresponds to the twist multiplier in indirect system of yarnnumbering. These are calculated as under:

Twistfactor = ‘ur~rx~universa, .OU”Iill ~cx

Twist multiplier =Turnshrrch

4Cotton munt

The relationship between twist multiplier and twist factor forcotton yarn is as under:

Twist factor = 9,6 x twist multiplier

1

IS 13683:2006

Table 1 Ring Spun, Grey, Cotton, Carded Single Yarn

(Clauses 4.1 and4. 1.3.2)

SI Requirement CountofYarnNo.

MethodA -

>59 texofTest,

36.9-53.7 29.5-34.7 20.3-28.1 1-5.1-19.7 10,9-14,8 10.71tex Ref to

(=1 0s) tex tex tex tex tex (54s) and(10s~16s) (17s-20s) (21s-29s) (30s-39s) (40s-54s) finer

(1) (2) (3) (4) (5) (6) c) (8) (9) (10)

i) Count CV, percent,Mm

ii) CSP, Min

iii) Lea Breaking LoadCV, percent, Max

iv) Yarn TenacitycN/tex, Min

v) Yam Tenacity CV,perceot, Max

vi) Breaking elongation,percent, Max

vii) (Unevenness,percent,Max

viii) lJnevenness CV,percent, Ma

ix) Iiairiness Index

x) Imperfectionskm

ThinThickNepsTotal

xi) Classimat faultsObjectionable faults,Max

Total fault, Max

NOTES

2.00

2000

13.5

9.0

10.50

13.13

7.0

310050

153

250

2.20

2100

14.0

9.0

12.00

15,00

6.5

412060

184

300

2.20

2200

14.5

9.5

5.2

12.00

15.00

6.0

414070

214

400

2.20

2200

6.0

15.0

10.0

12.50

15.63

5.5

20200280Soo

2

500

2.20

2300

15.s

10.5

12.s0

1S.63

S.2

50300425775

1000

2.20

2400

16.S

11.0

-5.0

14.00

17.s0

4.8

504006S0

1100

1500

2.s0 Is 1315

2400 IS 1671IS 1671

17.0 IS 1670

11.5 IS 1670

S.o 1S 1670

1S.S0 See Notes 1and 2

19.38

4,s See Note 3See Note 1

200700

I 1002000

See 4.1.3.2and Annex C.,, ,.

2000

1 The unevenness percentage (U percent) (see also Note 2) and the imperfections per km of the yam on packages shall not exceed thevalues given in Table 1 when tested at a speed of400 m/min and at sensitivity level of–SO, +S0 and +200 percent for thin places, thickplaces and neps respectively. The speeds and sensivity level are specified based on the most popular instrument for determiningevenness used in the testing for yam. The speed and sensitivity levels may be altered, subject to the agreement between the buyer andthe seller.

2 The unevenness percent can be expressed as coefficient of variation of unevenness using the formula

CV, percent= 1.2S XU, percent

3 The evenness testers are equipped with hairiness testing module which is used to measure hairiness in yams directly. The measurementzone is formed by a field of homogeneousparallel beam of light. The scattered light is caused by those flbres protruding outside theyarn body. The scattered light is a measure of the hairiness and it is measured electrically.

4.1.1.1 The twist in yarn shall be determined by themethod prescribed in IS 832.

4.1.2 Yarn Appearance

The average black board appearance (5 boards) shallbeat least of Grade B as specified in IS 13260. In caseof yarn counts coarser than 98 tex (6s) this shall be asagreed to between the buyer and the seller.

4.1.3 Freedom from Defects

4.1.3.1 The yam shall be free from defects listed inAnnex B.

4.1.3.2 If agreed to between the buyer and the seller,

2

the yam on packages may also be tested for classimatfaults and the values shall not exceed the values givenin Table 1or Table 2.

NOTE— The classimat faults are tested by the ClassimatSystem most commonly used in the mills. These are tested inclassimat tester where the yarn passes tbro%h the sensorsand the faults are expressed as number of faults per one lakhmetre of yarn. This system works on the capacitanceprinciple. Classimat faults shall be categorized as specifiedin Annex C.

4.1.4 Moisture Regain

Unless otherwise agreed to between the buyer and

IS 13683:2006

Table2 Ring Spun, Grey, C-otton, Comkd Single-Yarn

(Clauses 4.1 and 4.1.3.2)

SI Requirement Countof YarnNo.

Methodof- Tes~- b

259tex 36.9-53.7 29.5-34.7 20.3-28.1 15.1-19.7 10.9-14.8 7.9-10.7 7.8 texRef to

(~ 10s) tex tex tex tex (75s) and(10s-16s) (17s-20s) (21s-29s) (30s-39s) (40~54s) (55774s) finer

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)

i) Count CV, percent,Mm

ii) CSP

iii) Lea Bre&lngload CV,percent, Ma

iv) YarrsTenacity CN/tex,Mirr

v) Yarn Tenacity CV,percent, Mm

vi) Breaking Elongation,percent, Ma

vii) Unevenness, perwn~Mm

viii) Unevenness CV,percent, Ma

ix) Hairiness Index

x) Imperfections&m

Thin

Thick

Neps

Total

xi) Classimat Faults

Objectionable Faults,Mm

Total fault, Ma

NOES

1.80

2300

5.5

14.5

8.5

8.50

10.63

6.0

0

5

7

12

5

2.00

2400

15.0

8.5

9.00

11.25

5.8

0

8

17

25

8

2.00

2400

15.5

8.5

5.0

9.00

11.25

5.5

0

10

20

30

10

2.00

2-500

16.0

9.0

10.00

12.50

5.0

0

18

32

50

18

2.00

2500

6.0

16.5

9.0

11.00

13.75

4.7

1

26

53

80

8

26

---L.uu

2600

17.0

10.0

4.7

12.50

15.63

4.2

5

45

100

150

45

2.50

2700

17.5

10.0

4.5

13.00

16.25

3.3

15

80

165

260

.80

2.50 lS 1315

2650 lS 1671

18.0 IS 1670

10.0 IS 1670

4.3 IS 1670

14.00 See Notes]and 2

17.50

2.9 See Note 3

See Note 1

40

140

270

450

See 4.1.3.2andAnnex’C

140

1 Theunevenne% percentage (Upercent) (seeafm Note2)and theimperfections perkmofthe ymonpackages shall notexwed thevalues given in Tabk 1 when tested ataspeed of400m/min andatsensitivi~ leve~of-50, +50md+200 percent fortiin places, thickplaces andneps respectively. ~espeeds andsensitivity level arespecified bmedontie most popular instrument for determiningevenness used inthetesting foryam. ~espeed andsensitivity levels may bettered, subject totheagreement between the buyerndthe seller.

2 Theunevenness percent cm reexpressed mcoefflcient ofvmiation ofunevenness using tie fomula

CV, percent =l.25 XU, percent

3 ~eevenness testemmeequipped withhairiness testing module which isusedtomemu~ hairiness inymsdirectly. ~ememummentzone is formed by afield ofhomogenous pwallel beam of light. Thescatteredlightis causedbythosefibres protruding outside theyarn body. The scattered light is a measure of the hairiness and it is measured electrically.

the seller, the moisture regain shall not exceed8.5 percent.

4.1.4.1 The moisture content shall be determined bythe method prescribed in IS 199. The moisture contentso determined shall be converted to moisture regainusing the following formula

~ = IOOXMCR 100–MC

where

MR= moisture regain, percent, and

3

Mc= moisture content, percent.

4.2 Two-Fold Yarn @oubled Yarn)

4.2.1 The single yarn used for produci~ two-fold yamshall satisfy the requirements specified in 4.1.

4.2.2 The average resultant count of the two-fold yamshall be as agreed to between the buyer and the seller.However, a tolerance of+3 percent shall be permissibleon the average resultant count.

4.2.2.1 The resultant count shall be determined as perthe method prescribed in IS 1315.

IS 13683:-2006

4.2.3 Lea Breaking Load

The lea breaking load of two-fold yarn shall bedetermined by the method prescribed in IS 1671.

4.2.4 The ply twist in the two-fold yam shall be asagreed to between the buyer and the seller, and theaverage ply twist shall be within +5 percent of thespecified value.

4.2.4.-1 The twist shall be determined by methodprescribed in IS 832.

4.2.5 The yarn quality parameters of the double yarnshall -be as agreed to between the buyer and the seller,however, the yarn quality improvement due to doublingwhen compared to the single yam quality parameterswould be as given in Table 3.

5 MARKING

5.1 Each cone or cheese of yam shall be marked withthe following:

a)

b)

c)

d)

e)

o

Count of yam;

The words ‘carded’ or ‘combed’ alternativelyinitials ‘K’ for carded or ‘C’ for combed, asapplicable;

The words ‘100 percent cotton’ and in caseof yarn meant for hosiery ‘Hosiery yam’;

Net mass of yam in package;

Indication of the source of manufacture; and

Any other information required by the buyer

5.2 Each case containing cones or cheeses shall bemarked with the following:

a) Count of yam;

b) Gross mass of bale or case;

c) Net mass of bale or case;

d) Indication of the source of manufacture; and

e) Any other information re-quired by the buyeror by the law in force.

5.3 BIS Certification Marking

The conelcheese of yam and case containing coneslcheese may also be marked with BIS Standard Mark.

5.3.i The use of the Standard Mark is governed by theprovisions of the Bureau ofIndian Standards Act, 1986and the Rules and “Regulations ma& thereunder. Thedetails of conditions under which the licence for the useof the Standard Mark maybe granted to manufacturersor producers maybe obtained from the Bureau of IndianStandards.

6 PACKING

Unless otherwise agreed to.between the buyer and theseller, the yam shall be packed in accordance with theprocedure laid down in anyone of the Indian Standardsgiven below:

a) IS 293

b) IS 1347 ... ..

c) IS 3086

or by the law in force. d) IS 3325

Table 3 Yarn Quality Improvement Due to Doubling

(Clause 4.2.5)

S1 No. QualityParameters SiogleYarnCount Extentof Improvement,Percent

i) Lea CSP, Min 29.5-14.7 tex (20s40s) 10

14.7-9.8 tex (40s-60s) 12

9.8 tex (60s) aod finer 15

ii) Lea count CV (percent) All Counts 0.5”

iii) Lea strength CV (perwot) All Counts 1.0”

iv) Single yarn strength CV(pereent) AllCounts 20

v) Total imperfections >9.8 tex (< 60s) 90

9.8 tex (60s) and finer 75

vi) Classimat objectionable faults AllCounts 75

NOTES1 Percent improvement is in relation to the level of yam quality at single yarn stage.

2 The strength improvement depends upon the direction and amount of doubling tiist.

‘)Absolute values.

4

7 SAMPLING

7.1 Lot

In any consignment, the cases containing yam of thesame type and of the same nominal count shallconstitute a lot.

7.2 Samples shall be drawn from each lot to determineits confomi~ with the requirements of the standard.

7.3 Unless otherwise agreed to between the buyer andthe seller, the number of Gasesto be selected from a lotshall be in accordance with Table 4. The bales or casesshall be selected at random, and in order to ensure therandomness of selection, guidance may be obtainedfrom IS 4905.

Table 4 Sampling

(Clause 7.3)

S1 No. Lot Size Sample Size

(1) (2) (3)

i) up to 3 1ii) 4-1o 2iii) 11-30 3iv) 31-50 5v) Over 50 8

7.4 In case two or less cases are selected in the sample,at least 10 cones or cheeses shall be drawn at random

IS 13683:2006

from each of the selected case. However, in case threeor more cases are selected in the sample, atleast fivecones or cheeses shall be drawn at random from eachof the selected case. The number of leas to be preparedfrom each cone/cheese, The number ofleas so preparedfrom the lot shall be equal to 30.

7.4.1 In case single yarn tenacity is determined, thenumber of tests shall not be less than 50.

7.5 Criteria forConformity

The lot shall be considered as conforming to therequirements of this standard, if the followingconditions are satisfied:

a)

b)

c)

The average count calculated from the testresults lies within the tolerances specified andthe coefficient of variation for the count is lessthan those specified values.

The count lea strength product or tenacity, asthe case may be, is greater than or equal tothe minimum specified values, and thecoefficient of variation is less than thespecified values.

All the test specimens examined for defects,appearance, evenness, twist, moisture,hairiness index shall satisfy the relevantrequirements.

.,. ,

IS 13683:2006

1SNo.

199:1989

293:1980

832:1985

1315:1977

1347:1972

ANNEX A

(Clause 2)

LIST OF REFERRED INDIAN STANDARDS

Title

Textiles — Estimation of moisture,total sbe or finish, ash and fattymatter in grey and finished cottontextile materials (thirdrevision)

Code for seaworthy packagingof cotton yarn and cloth (thirdrevision)

Methods for determination of twistin yam @rst revision)

Method for determination of lineardensity of yarns spun on cottonsystem ~rst revision)

Inland packaging of cotton cloth andyarn @rst revision)

IS No.

1670:1991

1671:1977

3086:1965

3325:1965

4905:1968

13260:1993

Title

Textiles — Yarn — Determination ofbreaking load and elongation at breakof single strand (second revision)

Method for determination of yarnstrength parameters of yams spun oncotton system first raision)

Code for seaworthy packaging ofcotion hosiery yarn and goods

Code for inland packaging of cottonhosiery yam and goods

Methods for random sampling

Method of grading for appearance ofcotton yarn using photographicstandards

ANNEX B

(Clause 4.1.3.1)

COMMON DEFECTS OF YARN ON CONES AND HANKS

B-1 COMMON DEFECTS OF YARN ON CONES

a) Stitches of more than 2,5 cm in length at thebase,

b) Excessive stitches at the nose,

c) Sofi cones,

d) Hard Genes,

e) Collapsed cones,

o Prominent stains inclusive of chalk and othermarkings,

g) Cut threads,

h) Absence of tail-end where it is required thelength of the tail-end should not be less than30 cm,

j) Ribbon formation,

k) Drum cuts,

m) Shade variation, and

n) Count mix up.

B-2 COMMON DEFECTS OF YARN ON HANKS

a) Improper leasing;

b) Nose and tail-end not tied with tie yam;

c) Entanglement;

d) Presence of many knots with long tail-ends;

e) Presence of hard waste;

~ Excessive presence oftwistlessness, irregulartwist or cork screw effects in case of pliedyarns; and

g) Plying of wrong counts.

IS 13683:2006

ANNEX C

(Clause 4.1.3.2)

CLASSIFICATION AND CATEGORIZATION OF CLASSIMAT FAULTS

C-1 The classtiat fault shall be classified as short thick, C-2 OBJECTIONAL FAULTSlong thick or long thin as per the scheme given inTable 5 (see also Fig. 1).

Faults in the catego~ Al, B4, C3, Cd, D~ and Dd shallbe considered as objectional faults.

Table 5 Classification of Classimat Faults

S1No. Fault FaultLength, Cros*Sectional Increase Type of Faultcm Fault, Percent of Fault

(1) (2) (3) (4) (5)

i) Al 0.1-1 100-150 Shotithickii) AZ 0.1-1 150.250 Short thickiii) A~ 0,1-1 250-400 Short thickiv) A4 0.1-1 Above 400 Shoti thickv) Bl 1-2 100-150 Shortthickvi) B2 1-2 150-250 Shofi thickvii) B] 12 250-400 Short thickviii) B~ 1-2 Above 400 Short thickix) c1 2-4 100-150 Shortthickx) C2 2-4 150-250 Short thickxi) C3 2-4 250-400 Short thickxii) C4 2-4 Above 400 Shoti thickxiii) D, 4-8 100-150 Shotithickxiv) D2 4-8 150-250 Short thickxv) D] 4-8 250-400 Short thickxvi) D4 4-8 Above 400 Sho~ thickxvii) E 8-3 LOO-I50 Long thicAxviii) .F 8-3 45-1oo Long thickxix) G Above 32 45-100 Long thick “”xx) HI 8-32 -30-45 Long thickxxi) Hz 8-32 45--75 Long thickxxii) 11 Above 32 -30-45 Long thickxxiii) 12 Above 32 45--75 Long thick

CLASSIMAT FAULTS

A, B, c, D,

A, B, c, D,

A, B, c, D,

Al B, c, D, E

1 2 4 8

FAULT LENGTH (cm)

FIG.1 CLASSIMATFAULTS

7

mH, 1,

H, 12

32

ANNEX D

(Forewor~

COMMITTEE COMPOSITION

Man-made Fibres, Cotion and Their Products Sectional Committee,TX31

Organization

Textiles Committee, Mumbai

OffIce of the Textile Commissioner, Mumbai

Ashima Ltd, Ahmedabad

Central .Institute for Research in Cotton Technology, Mumbai

Century Textiles & Industries Ltd, Mumbai

Consumer Guidance Society of hdi& Mumbai

Directorate General of Supplies & Dispos#s (Mspection Wing),New DelM

G T N Textiles, Kerala

Indian Cotton Mills’ Federation, New Delhi

Indian Institute of Technology, Delhi

Indo Rama Textiles Ltd, Mumbai

Ministry of Defence (DQA), New Delhi

Ministry of Defence (WD), New Delhi

Reliance Industries Ltd, Ahmedabad

Rajapalayam Mills Ltd, Rajapalayam

“Synthetic and Art Silk Mills Association, Mumbai

The Ahmedabad Textile hdustV, Association Research Association,Ahmedabad

The Arvind MillsLtd,Ahmedabad

The Bombay Textile Research Association, Mumbai

The Lakshmi Mills Co Ltd, Coimbatore

The Rajasthan Spinning and Weaving Mills Ltd, Kharigram(Bhilwara)

The Southern India MI1ls’ Association, Coimbatore

The Synthetic and Art Silk MIIIs Research Asmiation, Mumbai

Vardharnan Spinning and General Mills Ltd, Ludhiana

Veermata Jijabai Technological hstitute (VJ~, Mumbai

BIS Directorate General

kpresentative(s)

Sm P. K. MONDAL(Chairman)SHFOs. sHANKARrAH(Alternate)

SRRSB. A. PAmL

Sm DWPAKPARWKAR

DR G F. S. HUSSNNDR R. P. NA~ (Alternate)

Sm MAHESHS~Smu V. WHARAN (Alternate)

Smrr ‘N. G. WA-S~TS .RSNUTALWANS(Alternate)

Sm A. K. SmoALSM SUNDERLAL(Alternate)

Sw V. N. BALAKRSSHNANSHSOK. P. UMATHAN(Alternate)

SHSUD. -K. NAMSmo U. K. JOSHS(Alternate)

PROF-B. L. DEOmPROFR. CHAmFADHYAY(Alternate)

Sm RmSH GOYAL

REPRESEmATm

Sm R. INOUSHSKHARSrnu ASWK YADAV(A/ternafe)

sHra s. P. Gomm-SrnuVrNAYCHAmDI (Alternate)

~RES~A~

Sm v. s. CHALKE

Smu J. M. GROVSR~ S. ~ (Alternate)

~FRSS~A~

Sm G D. BATWAL

REPmswATrvE

Sm N. K. SHRSVASWA

DR K. SELVWU

Sw M. K. BAROHANDR ARUFK. RAKSmT(A/fernate)

SrnrrV. K. ~YAL

DR A. R. -Smu S. P. BORKAK(Alternate)

SN M. S. VW, Director and Head ~)

.,

[Representing Director Gened (h-o~cio Member)]

Member ~cmta~

Sw Am KWRJoint Director (~), BIS

8

l~ureau of Indian Standards

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

Copyright

B]S has the copyright of all its publications. No part of these publications may be reproduced in any formwithout 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.l~nquiries relating to copyright be addressed to ,he Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are al-soreviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS Catalogue’ and ‘Standards : Monthly Additions’.

This Indian Standard has been developed from Doc ~No. TX 31 (0549).

,

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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Western : Manakalaya, E9 MIDC, Maml, Andheri (East)

{

28329295,28327858MUMBAI 400093 28327891,28327892

Branches : AHMEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FAMDABAD.GHAZIABAD. GU WAHAT1. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. NAGPUR.NALAGARH. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM. VISAKHAPATNAM.

R]nted at ~abhat Otiset Ress, New Delhi-2