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 11916 (2001): Textiles - Continuous Filament Glass Yarnfor Aerospace and other Purposes [TXD 13: Textile Materialsfor Aerospace Purposes]

Indian Standard

TEXTILES — CONTINUOUS FILAMENT GLASS YARN

FOR AEROSPACE AND OTHER PURPOSES —SPECIFICATION

.

(First Revision ) 1

ICS 49.025.fJ(J

0 BIS 2001

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

April 2001 Price Group 6

,4L!-

Textiles Materials for Aerospace Purposes Sectional Committee, TX 13

i

*: ‘

t ‘,t.,$?.{ [,,/4

FOREWORD,,

,*:, :1

This Indian Standard ( First Revision) was adopted by the Bureau of Indian Standards, atler the draft finalized by :,

the Textiles Materials for Aerospace Purposes Sectional Committee had been approved by the Textile Division ]

Council.%

This standard which was originally published in 1986 has been taken up for revision on the basis of experiencegained during its implementation. In the revised version, following changes have been carried out :

a) Nominal linear density of the yarn generally used have been modified as 33 tex, 66 tex and 134 tex in placeof 34 tex, 68 tex and 136 tex respectively;

b) Requirement for electrical conductivity has been modified;

c) Traverse speed for carrying out tensile strength test has been increased to 300 mm/min from 50 mm/min;

d) Characteristics of sizing formulations to be used also been included; and

e) Parameters for 13 micron diameter monofilament have been included.

The composition of the committee responsible for formulation of this standard is given in Annex D.

There is no corresponding International Standerd on the subject.

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 ( revised )’. The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.

IS 11916:2001

Indian Standard

TEXTILES — CONTINUOUS FILAMENT GLASS YARNFOR AEROSPACE AND OTHER PURPOSES —

SPECIFICATION

(First Revision )

1 SCOPE

This standard prescribes the requirements for a seriesof sized but otherwise untreated glass fibre yarns ofcontinuous filament type produced from low alkali‘E’ glass composition for aerospace and otherpurposes.

2 REFERENCES

The following Indian Standards contian provisionswhich through reference in this text, constitute provisionof tlis standard. At the time of publication, the editionsindicated were valid. All standards are subject torevision and parties to agreements based on thisstandard are encouraged to investigate the possibilityof applying the most recent editions of the standardindicated below:

LS’No. Title

832:1985 Methods for determination of twistin yarn (jkrtrevision)

1390:1983 Methods for determination of pHvalue of aqueous extract of textilematerials (firstrevision )

2303:1963 Method of grading glass foralkalinity

4420:1967 Methods for determination ofconductivity of aqueous and organicextracts of textile materials

SP45 :1988 Handbook on glossary of textileterms

3 TERMINOLOGY

In addition to definitions given in SP 45:1988 followingshall apply.

3.1 ‘E’ Glass

A low alkali glass composition containing not morethan 1.0percent alkali metal oxides expressed as N~O.

4 DESIGNATION OF THE YARN

4.1 Elements of the Designation

The elements in the designation shall appear in the

order of sequence given below ( see also Table 1 ):

a) Single Continuous Filament Yarn

1)

2)

3)

4)

5)

@

Type of glass used;

Letter ‘C’ for continuous filament yams;

Nominal diameter, in micrometres, of thefilaments, followed by a space ( see Table 2 );

Linear density, in tex, followed by a space;

Direction of twist, followed by a space; and

Amount of twist, expressed in turns per metre.

Example : EC933 Z 40

NOTE— Whenseveralstrandsare assembledin paralleland twisted together, give only the total linear del sityof all the strandsbeforetwisting. Forexample,startingwith fourstrandsof EC933 andtwistingthesetogether,the designationof the resulting yarn is EC9 132 Z 40.

b) Double&Plied Continuous Filament Yarn HavingIdentical Components

1)

2)

3)

4)

3

Designation of the single continuous filamentyam used without indication of the directionand the amount of twist followed by a space;

Multiplication sign, X, followed by a space;

Number of single continuous filament yarns,being twisted, followed by a space;

Direction of doubling/plying twist; followedby a space; and

Amount of doubling/plying twist, expressedin turns per metre.

Example EC933 x2S 160

NOTE— For yarn identification,see Table 1.

5 REQUIREMEN’113

5.1 Material

5.1.1 Alkali content of the glass used shall not bemore than 1.0 percent expressed as Na20 whendetermined by the method given in IS 2303.

5.1.2 Diameter of monofilament shall be as givenin Table 2 when tested by the method given inAnnex A.

. . ..----,

‘

1

XL

-d

IS 11916:2001

5.2 Yarn Twist

5.2.1 Unless otherwise agreed to between the buyerand the seller, the single yarn shall have a nominaltwist of 40 turns per metre in Z direction and the doubledyarn shall have a nominal twist of 160 turns per metrein S direction when tested by the method given inIS 832.

5.2.1.1 The mean twist found for each package shallnot differ from the nominal twist by :

a)

b)

c)

+20 percent for single yarn with a twist of 40turns per metre or less,

+ 15 percent for single yarns with a twist ofmore than 40 but not more than 150 turns permetre, and

& 15 percent for plied yarn with a twist up to150 turns per metre.

NOTE—Therequirementsgivenin 5.2.1.1areforguidanceonly.

Table 1 Guide to Yarn Identification System

( Clause 4.1 )

FilamentCode

(1)

ECD

ECD

ECE

ECG

ECG

ECG

ECD

ECD

ECD

ECD

ECD

ECD

ECD

ECD

ECD

ECD

ECD

ECD

ECE

ECE

Yarn Count(Glass System)

(2)

900 1/0

450 1/0

225 1/0

150 1/0

75 1/0

37 1/0

900 1/0

900 1/2

900 1/3

450 1/0

450112

450 1/3

450 2/2

450213

450 2/5

450 3/3

450 3/4

450517

225 1/0

225 1/2

YarnDesignation

(tex)

(3)

EC5 5.5 Z 40

EC511 Z40

EC7 22 Z 40

EC9 33 Z 40

EC9 66 Z 40

EC9 134 Z 40

EC5 5.5 Z 160

EC5 5.5ZX2 S 160

EC5 5.5 ZX3 S 160

EC5 II S 160

EC511X2S 160

EC511X3S 160

EC511X2X2S 160

EC511X2X3S 160

EC511X2X5S 160

EC511X3X3S 160

EC511X3X4S 160

EC511X5X7S 160

EC7 22 Z 160

EC7 22 X 2 S 160

Table 1 ( Concluded)

Filament Yarn Count YarnCode (Glass System) Designation

(1)

ECE

ECE

ECE

ECE

ECE

ECE

ECE

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

ECG

(2)

225 1/3

225212

225213

225215

225313

225 3/4

225 5/7

150 1/0

150112

150 1/3

150 2/2

150213

150214

150215

150313

150314

150415

150 5/7

75 1/0

75 1/2

75 1/3

37 I/o

37 1/2

37 113

37 1/5

(tex)

(3)

EC722X3 S 160

EC722X2X2S 160

EC722X2X3S 160

EC722X2X5S 160

EC722X3X3S 160

EC722X3X4S 160

EC722X3X7S 160

EC9 33 Z 160

EC9 33 X 2S 160

EC933 x3 S 160

EC933X2X2S 160

EC933X2X3S 160

EC933X2X4S 160

EC933X2X5S 160

EC9933 X 3 X 3 S 160

EC933X3X4S 160

EC933X4X5S 160

EC933X5X7S 160

EC9 66 S 160

EC9 66 X 2 S 160

EC966X3 S 160

EC9 134 S 160

EC9 134x2S 160

EC9134X3S 160

EC9 134x5 S 160

NOTE — The exact TPM, both for single and plied yarnsare known to vary from manufacturer to manufacturer,hence; this table is for guidance only.

5.2.1.2 The mean twist of each lot shall not differfrom the nominal twist by:

a)

b)

c)

+ 15 percent for single yarns with a twist of 40turns per metre or less,+ 7 percent for single yams with a twist of morethan 40 but not more than 150 turns per metre,and+ 10 percent for plied yarns with a twist up to150 turns per metre.

5.3 Grade

5.3.1 Glass yarn shall be classified as given in Table

.

L

,,.‘

IS 11916:2001 ,4

2 dependrng upon the monofilament diameter.

Table 2 Monofilament Diameter

( C/auses 4.1, 5.1.2 and5.3.l )

NominalDiameter

for Coding(Microns)

(1)

5

7

9

13

Mean Tolerance FilamentDiameter Designation(Microns)

(2) (3) (4)

5.71 & 0.65 D6.99 ZL0.65 E9.74 * 0.83 G

13.0 * 0.83 K

5.4 Linear Density

5.4.1 The linear density of glass yarn shall be asgiven in Table 3 when tested by the method given inAnnex B.

5.4.2 The coefficient of variation of the linear densityof glass yam shall be less than 10 percent and texdeviation from the standard value ( see Table 3 ) lessthan 6.5 percent when calculated by the formula givenin B-7.4 and B-7.5.

5.5 Tensile Strength

The minimum average tensile strength of glass yarnshall be as given in Table 3 when tested by the methodprescribed in Annex C.

5.6 Ignition Loss

The ignition loss of glass yarn when determined bymethod given in Annex B shall not be more than3 percent. However, in case of glass yarn with nominaldiameter of 5 microns, it shallnot be morethan4 percent.

Table 3 Yarn Tex and Tensile Strength

( Clauses 5.4.2,5.5,7 andB-7.5 )

Yarn Yarn Linear Mean SingleCount Designation Density, Yarn Breaking(Glass Tex Strength

System ) (kgf)

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

900 1/0 EC5 5.5 Z 40 5.5 0.22

450 1/0 EC511 Z40 11 0.44

225 1/0 EC5 22 Z 40 22 0.90

150 1/0 EC5 33 Z 40 33 1.35

75 1/0 EC5 66 Z 40 66 2.47

37 1/0 EC5 134 Z 40 134 5.0

NOTE — TM table gives only breaking strength of singleyam because breaking strength of doubled or plied yamshall generally be multiples of that of basic single yarn.

5.7 pH Value of Aqueous Extract

I

—...-,The pH value of the aqueous extract of ‘glass yam

,,:

shall be within the range 7.0 to 10.0 when determinedby the method given in IS 1390. \,;,,,!,5.8 Electrical Conductivity

The electrical conductivity of the aqueous extract of {glass yarn shall not exceed 7.0 micro-simens per metrewhen tested by the method given in IS 4420.

5.9 The glass yarn shall be sized with starch/dextrinand the following shall be ensured:

a)

b)

c)

d)

Ash content of starch/dextrin shall be less than0.5 percent;

pH of 5 percent solution of starch/dextrin at25° C shall be 6.0 + 1.0;

Formaldehyde content shall be 0.3 percent onoverall size formulation and 3 percent on starch/dextrin content; and

Hydrogenated vegetable oils as ingredientto sizing formulation shall have followingcharacteristics:

Melting point 40* 2°C

Acid value 0.15 Max,.

Saponification value 140-200

5.10 Visual Inspection

5.10.1 The cops when visually inspected shall meetthe requirements specified in 5.10.1.1 to 5.10.1.6.

5.10.1.1 Freedom from dark streab and dirty joints.

Three or more such streaks each 5 cm in length onindividual cop surface or in under layers may occur.If the cops can be stripped to remove such streaks,then this may be done.

5.10.1.2 Loose yarn at tapered end of the cops(sloughing of)

Cops shall be flee from loose yam, shiny yarn ( lackof size ) and sloughing off at tapered end. Theoccurrence of such cops will render them subject tostripping as per agreement between the buyer andthe seller.

5.10.1.3 In case of plied yarn, the cops shall haveperfectly balanced yarn. Unbalanced yam shall bedetermined by holding the ends of one metre of yam2 cm apart. Obvious rapid spiraling will indicateunbalance in the yam.

5.10.1.4 Cops shall be free from dirty and loopy yarn.Three or more such loops on individual cop surfaceshall necessitate stripping. Loops appearing in underlayers shall be dealt similarly.

3

IS 11916:2001

5.10.1.5 The cops shall be reasonably free fromfilamentation and hairiness.

5.10.1.6 The cops shall also be reasonably flee fromthe following defects :

a)

b)

c)

d)

e)

f)

g)

h)

J]

k)

m)

n)

P)

0

r)

s)

t)

Flared package;

Undercut package;

Damaged tubes or bobbins (with cuts, bruisesor breaks);

Cracked winding (partial gap in winding);

Entrapped waste;

Entrapped foreign matter;

Protruding end ( generally due to a poor spliceor poor start-up );

Entrapped end;

Package too soft;

Package too hard;

Defective or dirty transfer;

Dirt”sports and mildew;

Bad build of the package;

Package unflanged with loops on their end faces;

Incorrect identification;

Package abraded after its manufacture; and

Slubs, fuzz balls.

6 SAMPLING

6.1 Lot

The quantity of continuous filament textile glass yarnof one definite designation delivered to a buyer againstone despatch note shall constitute a lot.

6.2 Unless otherwise agreed to between the buyerand the seller, the number of packages to be drawntlom each lot shall be as given in Table 4.

7 CRITERIA FOR CONFORMITY

The lot shall be declared conforming to therequirements of this standard if the following conditionsare satisfied:

a)

b)

c)

d)

The average alkali content of the glass usedsatisfies the requirement given in 5.1.1;

The monofilament diameter meets therequirements given in Table 2;

The yam twist meets the requirements givenin 5.2.1 and 5.2.1.2;

The tex count of yam meets the requirementsas given in Table 3 and 5.4.2;

e)

f)

g)

h)

4

From the test results for breaking strength, the

d

,,

average~ and the range R shall be calculated :.:,,,and the value of the expression Y– 0.6 R is greater

,,,

than or equal to the co;esponding limit sp~cifiedin Table 3;

The average ignition loss of the glass yarnsatisfies the requirement given in 5.6;

“’!All the test results of pH of aqueous extract {

of glass yarn and the electrical conductivityof aqueous extract of glass yarn satisfy therelevant requirements; and

The lot is reasonably free from the defects givenin 5.10.

8 PACKAGING AND PACKING

8.1 The yarn shall be wound in continuous lengthon cheeses, cops, bobbins, cones, etc, which shallthen be wrapped/enclosed in a suitable moistureproofplastic film or bag. This shall constitute a package.An appropriate number of packages shall be placedin cardboard carton with top and bottom punchedboards and guidepins or any other suitable packingmaterial as agreed to between the supplier and thepurchaser so as to prevent darnage in transit. Adequatecare shall be taken to prevent undue movement orpackages in the carton.

8.2 The gross mass of the case or carton shall notexceed 100 kg.

9 MARKING

9.1 Each package shall be tied with a suitable labelon which the following information shall be marked:

a) Name of the material;

b) Indication of the source of manufacture;

c) Month and year of manufacture;

d) Designation of yarn and monofilament diarnete~

e) Identification code of yarn ( see Table 1); and

i) Any other information as stated in the contractor order.

9.2 BIS Certification Marking

Each package may also be marked with the StandardMark.

9.2.1 The use of the Standard Mark is governed bythe provisions of the Bureau of Indian StandardsAct, 1986, and the Rules and Regulations madethereunder. The details of the conditions under whicha licnece for the use of the Standard Mark may begranted to manufacturers or producers, maybe obtainedfrom the Bureau of Indian Standards.

.,

4

IS 11916:2001

Table4 Selection of Samples

( Clause 6.2)

S1 No. Total Number Sample Maximum Number of Packages toof Packages Size be Taken per Casein the Lot ( Number of

Packages ) Number of Packages per Case

(1)

i)

ii)

iii)

iv)

v)vi)

vii)

viii)

ix)

x)

xi)

xii)

xiii)

xiv)

(2)

Less than 3

3t08

9 to 15

16 to 25

26 to 40

41 to 65

66 to 110

111 to 180

181 to 300

301 to 500

501 to 800

801 to 1300

1301 to 3200

3201 to 10000

(3)

All

3

3

4

5

7

10

15

20

25

30

35

40

50

1to2

(4)

1

2

2

2

2

2

2

2

2

2

2

2

2

3to4

(5)

—

2

2

2

2

2

2

3

3

3

3

3

3

3

5to8

(6)

—

2

2

3

3

3

3

3

3

4

4

4

4

4

9to12

(7)

—

—

3

3

4

4

4

4

4

5

5

5

5

5

13to25

(8)

.

—

3

4

4

5

5

5

5

5

5

5

6

6

26to50

(9)

—

—

—

—

5

7

7

7

7

9

9

9

10

10

51to

100

(lo)

—————

7

10

10

10

13

13

13

13

13

101to

180

(11)

—

—

—

—

—

—

1015

15

15

15

15

15

15

For example — If the batch consists of 36 cases and there are 9 packages per case then total number of packages =9 X36 F 324.

From Table 4, S1No. (x) and COI3, the number of packages to be selected = 25.

Now reading in CO17 along S1No. (x) we get the number Ofcases to be seIected equal to 5. So in lot of 36 cases :

a) 5 cases have to be selected, and

b) from each of the case 5 packages have to be selected.

NOTE — For lots above 10000 packages or for cases ccmtaining more than 180 packages, sampling shall be the subjectto an agreement between the supplier and the purchaser.

.

5

IS 11916:2001

ANNEX A

( Clause 5.1.2)

DETERMINATION OF DIAMETER OF MONOFILAMENT

A-1 APPARATUS

A-1.l Projection Microscope

Having a magnification of 1 000 X and having:~movable stage on which a slide can be mounted; andcapable of measuring accurate to the nearest 0.1 pm.

A-1.2 Glass Slides

Of size suitable for mounting on the stage of theprojection microscope.

A-1.3 Thin Glass Cover Slips

For the slides.

A-1.4 Mounting Medium

Comprising equal volumes of glycerine BP and distilledwater.

A-1.5 A Pair of Tweezers

A-1.6 A Glass Rod

Of 150 mm length and 3 mm or 6 mm diameter.

A-1.7 A Wire Mesh Basket

Approximately 100 mm x 75 mm x 25 mm size madefrom stainless steel.

A-1.8 A Muffle Furnace

Capable of operating at 550 ● 25°C.

A-2 PROCEDURE

A-2.1 Weigh a test sample of about 5 g free fromforeign matter with the help of razor blades, cut thefilaments into fibres of 1 cm to 2 cm size. The testsample may or may not contain a resin binder or size.

NOTE— If thetestis beingused to check fibre diameterin relation to a particular sliver tex then the sampleshall be taken from a nominal tex package, or the actualtex shall be quoted.

A-2.2 If the sample is bonded or sized, place it inthe wire mesh basket and heat it in the muffle furnaceat 550+ 25°C until all lraces of binderor sizeam removed.

NOTE— Unbendedor unsizedsampledoesnot requirethis form of treatment.

A-2.3 Preparation of Slides

A-2.3.1 Using the glass rod, place one drop of glycerinesolution on a slide.

A-2.3.2 Extract

IS 11916:2001 *

ANNEX B

( Clauses 5.4.1,5.4.2 and 5.6)

DETERMINATION OF LINEARDENSI’IYAND IGNITION LOSS OF GLASS YARN

B-1 TERMINOLOGY

B-1.l Linear Density

The mass per unit length of desized oven-dried glassyam expressed in Tex System.

B-1.2 Pre-tension

The tension applied to a yarn or roving beforedetermining the linear density or the twist,

B-1.2.1 Value of yam pre-tension ( F) applied witha tolerance of * 10 percent, of textile glass continuousfilament yam, is given by the formula:

‘(tex) = A ( decitex)‘(Newtons) =

200 2000

where A is the sum of the nominal linear densities ofthe strands constituting the yam.

B-1.2.2 The strand pre-tension of a yam is expressedin newtons according to Table 5.

Table 5 Strand Pre-tension

( Clauses B-1 .2.2 andB-4.l )

Linear Density Pre-tension/ > in Newtons

In Tex In Decitex

125 1250 0.40

190 1 900 0.50

340 3400 0.75

680 6800 1.00

2000 2000 2.00

For intermediate linear densities, calculate the normalpretension by interpolation.

B-2 PRINCIPLE

B-2.1 A specimen of known length of glass yam afterdesizing is calcined to constant mass at a standardtemperature of 625+ 20°C and then linear density iscalculated in grams per kilometre.

NOTE— For glass yams which are unstable at the abovementioned temperature, a temperature between 500 and600”C may be chosen according to glass specificationor as per agreement between the buyer and the seller.The chosen temperature must be kept constant within* 20”C tolerance.

B-3 APPARATUS

B-3.1 Muftle Furnace

Capable of maintaining the standard temperature of625 * 20°C, or the chosen temperature * 20”C.

B-3.2 Desiccator

Containing a suitable desiccant ( for example, silicagel, calcium chloride, phosphorous pentaoxide ).

B-3.3 Specimen Holder

B-3.4 Stainless Steel Tongs

B-3.5 Balance

Accurate to 0.1 mg.

B-3.6 Wrap Reel

For the unwinding of the yam, the perimeter preferablybeing equal to 1m, equipped with a revolution counterworking from a set value to zero or vice-versa.

B-3.7 Air-Ventilated Oven

For drying the specimen, capable of being controlledat 105 * 2°C or 80* 2°C or the chosen temperature+ 2°C ( see Note under B-5.1.2.2 ).

B-4 TEST SPECIMEN

B-4.1 From each package selected in 6.2, unwindunder a standard pre-tension ( see Table 5 ), takingcare to avoid any modification of twist during theoperation, test specimen of length given in Table 6.

B-4.1.1 For plied yarn, take the length of specimencorresponding to that of the single yam from whichit was constructed, divided by the number of endsconstituting the plied yam.

B-5 PROCEDURE

B-5.1 Desize the test specimen ( see II-4.1) as describedin B-5.1.1 and B-5.1.2.

B-5. 1.1 Weighing of Holder

Stabilize the mass of holder by placing it in the mufflefhmace controlled at a temperature of 625 + 20”C orat the chosen temperature between 500 and 600°C(see B-2.1 ). Cool the holder in the desiccator in standardatmosphere of 65 + 2 percent relative humidity and27* 2°C temperature. Weigh the holder to an accuracyof 0.001 g. Note the mass of holder (mO)in g.

7

.

IS 11916:2001

Table 6 Length of Specimen

( Clause B-4.1)

Linear Density, Tt(Tex)

~

,,,

B-7.6 Calculate the percentage ignition loss ( L ) of a)each test specimen by the formula :

ml –mzL=—m,-mo x ’00

b)

where

m~ =

.ml =

m2 =

c)

mean, in grams, of the holder;

mass, in grams, of the holder plus dried d)

specimen; and

mass in grams, of the holder plus dried and e)calcined specimen.

B-7.7 Report o

The report shall include the following particulars :

~ 11916:2001 4j

Actual linear densities (’~’,of all the individualtest specimens;

,{

..--, ,,,/

The mean actual linear densi~(,~) of the batchor the consignment; ,,

*!The coefllcient of variation ( V) of individualvalues for all the measurements;

The percentage of linear density deviation(d) j

of individual values for all the me~urements;

The average ignition loss in percentage; and

The heating time in the oven and the temperatureof the muffle furnace, if the latter differs from625 ● 20°C.

ANNEX C

( Clause 5.5)

DETERMINATIONOF TENSILE STRENGTH

C-1 APPARATUS

C-1.l The tensile testing machine used shall include:

a) a pair of suitable clamps to grip the specimen;

b) means for elongating the specimen; and

c) a meehanism which will indicate or record theload applied to the specimen and thecorresponding elongation.

C-1.l.l Following types of testing machines may‘be used:

a) constant rate of load;

b) constant rate of specimen extens&; or

c) constant rate of traverse of driven clamp.

C-1.1.2 The testing machine shall ba capable oflestingspecimens having a nominal gauge length of 250+lnp.

NOTE — By agreement between the interested parties,other nominal gauge length may also be use~ althoughin these conditions the test results maybe slightly differentRin those obtained with the gauge length of 250 +1 mm.

C-2 CONDITIONING AND TESTING

C-2.1 Pre-condition the packages selected by exposingin an atmosphere having temperature of 80 + 2°C andrelative humidity not exceeding 10 percent until asubstantially constant mass is obtained.

C-2.2 After pre-conditioning, bring the packagesselected to a state of moisture equilibrium by exposingthem in a standard atmosphere of 65 * 2 percent relativehumidity and 27 ● 2°C temperature for at least 3 h.

C-2.3 The test specimens shall be tested in a standardatmosphere given in C-2.2.

C-3 TEST SPECIMENS

C-3.1 Take ten speeimens from each package selectedhaving a length of at least 600 mm of yarn; a lengthof 1000 mm facilitates handling and preservation oftwist.

C-3.1.1 The yarns to be tested shall be talp fromthe package in such a way so as to avoid any abnormalchange in twist. Preferably the yarn shall be unwoundtangential, by causing the package to rotate aroundits own axis, in such a way that the yarn remainsconstantly under tension. Remove the outer layerof yam and then take five test specimens leaving5 m after drawing each sample, each test specimenconsisting of an entirely new portion of yarn; thenunwind approximately 100 m of the yarn before takingthe last five test specimens in a manner describedabove, these being made up from an entirely newportion of yarn.

C-4 PROCEDURE

C-4. 1 Check that the distance between the gripsof the testing machine is 250+ 1 mm ( see also Note

9

IS 11916:2001

below C-1.l.2). Check that’the grips arecorrectlyaligned and parallel in such a way that the force appliedto the test specimen does not produce any angulardisplacement of the grips.

C-4.2 After conditioning asspecified in C-2.2, gripthe test specimen in tensile tester so that the axis ofthe test specimen is perpendicular to the edge of theclamps.

C-4.3 Apply to the test specimen a pre-tensionof 5 + 0.5 mN/tex, calculated from the nominal lineardensity of the yam, “unless the pre-tension extendsthe specimen by more than 0.5 percent in which casea lower pre-tensison ( for example, 2.5 mN/tex orI mN/tex ), may be used as per the agreement betweenall the interested parties.

C-4.4 Set the moving clamps m motion at a test speedof 300 rn.dmin. After breaking of the specimen, recordthe maximum force and elongation at break. Returnthe moving clamp to its zero position and remove theends of the broken specimen.

C-4.5 Disregard any observation made on testspecimens that slips between the jaws, or that breakin, or within 10 mm of the jaws. The number ofobservations that are ignored shall be counted, if itexceeds 10 percent of the number of specimens tested,the clamps shall be readjusted.

C-4.6 Calculate the arithmetic mean of the individualresults obtained for the breaking force and percentageelongation at break.

ANNEX D

( FOrewmi )

Textile Materials for Aerospace Purposes, TX 13

Chairman Representing

SHR1L HUSAIN Ministry of Defence (R&D), ADRDE, Agra

Members

SHRIG. L. MOONDRA Indian Rayon & Industries Ltd (Unit: Jaya Shree Textiles), Rishra,Distt. Hooghly

SHRI B. L. MODI ( Alternate I )SHRI K. K. GOSWAMI( AJternate H )

INDUSTRIALPRODUCTSMANAGERMANAGER( Q&C ) ( Alternate) Madura Coats Ltd ( Thread Division ), Bangalore

SHRI S. B. TOD1 Todi Industries Ltd, MurnbaiSHRIN. B. TODt ( Alternate)

SHRIGAUTAMS. NANAVATY Unnati Corporation, AhmedabadSHRIJANAKG. NANAVATY( AJterntNe )

SHRIS. SUISDARA~ FGP Ltd, Hyderabad

SHRISUNU PRAHLADKA Motilal Dulichand (P) Ltd, Kanpur

SHRIR. SHAFJKAR Shriram F]bres Ltd, CbennaiSHRI R. NAGARAJ( Alternate )

SHRIV. K. SHAR~A Indian Airlines, New DelhiSHRXB. N. SETH( AJternate )

SHRIMAHENDRASWARUP Ordnance Parachute Factory, KanpurSHRIV. K. AILWADI( AJternate )

LT COL S. S. SAINI Ministry of Defence (DGQA), New DelhiSHRIA. CHOUDHARY( Alternate )

GP Cm S. K. CHATTERJEE Air Headquarters, Ministry of Defence, New DelhiWC CDR S. NAGRAJAN( Alternate)

( Continued on page 11)

\ 10

,;’ ,

--

IS 11916:2001

( Continued from page 10)

Members

SHRIS. B. PRASADSHRI SANJAYCHAWLA ( Alternate )

SHRIB. G. V. SUBRAHWANW4M

NOMINATIONAWAITED

SHRI N. M. WALECHA ( Alternate )

SHRtS. N. AGGARWAL

SHRIS. SUNDARAM

SHRIS. RAGHUNATHAN( Alternate )

NOMINATIONAWAITED

SHRIS. P. KALASHRI S. CHAKRABARTY( Alternate )

SHRIY. K. KUSIJMGARSHRIKIRANN. SHAH( Alternate)

DR O. P. BAHL

SHRIK. C. J. MODYSHRIATUL K. MODY ( Alternate )

PROF( Ms ) P. BAJAJ

SHRIR.K. DUA,Director ( Tex )

Representing

Ministry of Defence (DGQA), New Delhi

Indian Space Research Organization, Ahmedabad

Directorate General of Civil Aviation, New Delhi

Directorate General of Technical Development, Ministry of Industry,New Delhi

Ceat Tyres of India Ltd (Glass Fibre Division), Secunderabad

Hindustan Aeronautics Ltd, Kanpur

Office of the Textile Commissioner, Mumbai

Kusumgar Corporate, Mumbai

National Physical Laboratory, New Delhi

Atul Aakash Merchants PYt Ltd, Mumbai

Indian Institute of Technology, New Delhi

Director General, BIS ( Ex-officio Member)

Member Secretary

SHRIANILKUMAR

Deputy Director ( Tex ), BIS

II

Bureau of Indian 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 goods andattending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications maybe reproduced in any form withoutthe prior permission in writing of BIS. This does not preclude the free use, in the course of implementing thestandard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating tocopyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises onthebasis of comments, Standards are also reviewedperiodically a standard along with amendments is retilrmed when such review indicatea’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 issueof ‘BIS Catalogue’ and’ Standards: Monthly Additions’.

This Indian Standard has been developed from Doc : No. TX 13 ( 0263 ).

.

I

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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