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 4770 (1991): Rubber Gloves - Electrical Purposes [PCD13: Rubber and Rubber Products]

IS 4770 : 1991

'J-fJ '< cf) 2J Jil rt Cf)

~~ cpp:ff ~ ~ ,<q~ ~~-~

(qfj(>fl g-;rfterar)

Indian Standard

RUBBER GLOVES - t~LECTRICAL

PlJRPOSES - SI)~~CIFICArI~ION

( First Revision)

~cl()nd Rcprmt fl'l ') 200X(Inc luduu. vnu ndru,.. nt No I)

l JI)( 68 ~ 1" 621 ~ 7S I

co HIS 1991

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADlJR Sl-IAII ZAFAR MARC;

NEW [)l:LIII 110002

August 1991 Price {;roup 7

(Reaffirmed 2012)

AMENDMENT NO. 1 FEBRUARI ZOOITO

IS 4770: 1991 RUBBER GLOVES - EIJE(~TRICAL

PURPOSES - SPECIFICATION

[ Page 3, Table 2, 51 No.(ii) J - Subsutute the Iollowmg for the exisnngmatter:

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

ii) Tensile stress al 2eO 2 1 2 1percent elongation,

MPa, Max

(6)

3400 (P..rt 1)19:17

(PCD 13)

f - 275 Uf\/2CXlh

Rubber Prod ucts Sccuon.il Cornnuttce PC 0 11

F ORl:WORI)

This Indi.m St.md.u d ( Fu ~t Revivrou ) V/I\ ~ adopted by the Bure4111 of Ind i.m Standards, after thedraft fin ihved hy the R ihber Products Sec..lH.HIL1Il\)1111l11ttee had been approved by the Petroleum,('oJI .md Related Products D1\ isron Council

Rubber gloves fOI electr rcal purpose- after protection to workers from electnc shocks while workingon energized conductors and equipment l Iowever, It does not imply that rubber gloves shall bethe only means of protec non for those working on elect: ICed closed CI n.. mts Of corn ponents AIIpossible precautions shall be taken againvt the hazard of shock and \\ hvncvcr povviblc the ClfCU It"

should be disconnected

This standard was firvt pu bh-hcd In ]9118 and pi csc u bed four ty pes of gloves su itablc for 1l13XI rnu mworking potential of 6"0, I 100, 1 100 .md 4 000 volts In this revrvron requirements of Type 3 andType 4 gloves have been modified to make then} suitable 101 working pULCn1Jd ) up to 7 SOO and17 000 volts respectively

ln actual pracucc the WOI kcrv are requu ed to work on enct grzcd cqurpments only III cases wherethe working potentials arc of the order of 415 V and wuh loose fillings gloves It I~ very difficultto grip the objects In this revrsion close nttrngs thinner gloves have been prescribed for workingpotentials up to 650 V to have high degree of flevibrhty

I'hc double test prescribed for the electrical properties covers addiuonal safety factor dud takes Intoaceo un t eITec t 0 f storL1 ge In hunud co nd It1011 Wh11 C ,l rca soni.\b1c 11 fe hdS been ensured by theVdflOUS tests p ovided, It ICi recommended that the gloves should not he unnec cssar .ly exposed toheat or light, or allowed to come In contact with solvents, oils, grease, turpentine, motor vpmts orstrong acid and are not to be stored In cont.uner-, \\ hell h.ivc deleterrou-, effect nn rubber

Length of the gloves IS given m cla usc 5.4 lind tYP1Cdl drmensions tOI the popularly used <;ILe~ 8, 9and 11 are given in Annex A Guidance for care, maintenance. Inspection, re-te~t and use ofrubber gloves I~ given 111 Annex B

I his sta ndard cont.nns clause 7.1 wlnch calls for agreement between the purchaser and the supplier.

l-or the purpose of decid: ng whether a particular requi rernent of this standard IS complied with 9 thefinal val ue obvei \ cd or calculated, expI essmg t he I c-u It of d test or analysis, shall be rounded off 111

d<...CO J ince with IS 2 1960 'Rule" for rounding off numenc.il values i revtsed )' The numberof vrgmfic.int places ret.uned In the rounded off value should he the sarne as that of the specified\ due In tlus standard

IS 4770 : 1991

Indian Standard

RUBBER GLOVES - ELECTRICALPURPOSES - SPECIFICATION

( First Revision)

This standard prescribes requirernentv, methods ofsampling and test for r11 bbcr insulating gloves forelectrical purposes.

3.3 Routine Tests

Tests carried out at manufacturer's works on eachglove to check the requirements ""hich are likelyto vary during production.

2 REFERENCES4 TYPES

3.1 Type l~est~

3.2 Acceptance Tests

Tests carried out on samples taken from a lot Iorthe purpose of acceptance of the lot.

5.1 Composit ion

4.1 This standard cover following four types ofgloves:

5.3 Shape and Sire

"1 ype t glov C"t ~bJ 11 he of l he sh., pe Ll~ ~l\ ell j t~

Flf!. 1 and I ype-, 2 to 4 glt.)vc'i shall be of loo~ ~

fitting shape d." t!1\Cn 111 I"Jg 2. The recommended~llr~ are given In Annex A.

5 REQlJIREMENTS

4.1.1 -r) pe 1 glovcs shall be the wrist type (closefitting ), wlule T~ pt 2, Type: 3 and Type 4 shallhe guuntlct type.

Type J - For use at voltage not exceeding650 ac rrns

Tvpe 2 - For use at voltage not exceeding1 100 ac rms

If gloves are made from calendered sheets, ~dJ

joints shall be made by butting or skiving theedges closely together and strengthening bothsides by means of strips or fape, of the sam-:material as the sheets These shall he suitabtvvulcanized to conform to (he requirements of thl~pee: f C,\ t Ion.

1)'Pe 3 - For use at voltage not exceeding7 500 ac rrns

1\1Je 4 . - For use at voltage not exceeding, 7 000 ac rrns.

5. 1.1 T ypc 1 g IO\~, <.. ha l l he- rnade fr(HTI goodquahty natural rubber.

5.2 Construction

The gloves shall be made either by dipping, Iflatex 1'-. used or trom calendered sheets. Thegloves shall have J. vruooth finish and the cutfedges shall be tlpl~'1cd with a roll or a reinforcmgstrrp of rubber, unless specified otherwise.

5.1.2 Type- 2, 3 LUlU 4 glovc-, shall be made fromgood quality natural or vynthetrc rubber or frorna mixture thereof.

necessary

Title

Method for voltage meavure­ment by means of sphere-gaps( one sphere earthed)Electrotechnical vocabulat y

IS No

1876 . 1961

The followi ng Ind Ian Standards areadjuncts to this standard:

1885( Par t~ 1 to o6 )

340(' Methods of test for vulcani/cdrubbers:

( Pa rt I ) : 1997 Tensile '-,t res~--~tra 1n properties( second revision )

(Part ~) . 1987 Accelerated ageing (secondrevision )

( Pal t 13 ) : 1903 Tension set ( Ii, st rc \tsion )

( Part 17) : J97 J Tear strength -- angular testpieces

l Pal t 20 ) . 1977 Resistunc.. e to oz one37()8 rvlet l,0 d:'t U r h.,.") t Iornat uraj

rubber latex:( IJal t 8 ) : 1986 Determination of total nitrogen

( NRL : 12 ) (first reviston )

( Part 9 ) : 1986 Deteuninauon uf total ash( NRL : 16 ) i firs] revIsIon)

7503 Glossary of terms used In( Parts I to 6) rubber industry

3.0 For the purpose of tlus standard, thedefinitions given in various parts of IS 1885,IS 7503 and the following shall apply.

1 ests carried out to prove conformity with thespeciticarton. These are intended to prove thegeneral qi.aliues, desjgn and raw materiul of agiven type of gloves.

IS 4770 : 1991

5.4 Length

The minimum internal length from the tip of thesecond finger to the edge of the cuff shall be2S0 mm for the wrist type and 400 mm forgauntlet type"

~.5 Thickness

The thickness of the gloves when determined asin Annex C shall meet the requirements specifiedin Table 1.

Table 1 Tbickness of Gloves( Clause 5.5)

Type Mlnlmuna Thickness at J\,laxlmum

r-------A------~ Thl~kll(\S5

Crotch' Non-crotch ( Both)Area Area

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

mill mm 1111\1

1 O"SO 0"S5 0'95

2 0'70 O"SO 1"25

3 O'SO 0"95 1'50

4 1'05 t·30 2'30

lCrotch area i, a cucular area 12 'Olllt radius whosecentre is at Intersectlon of the plane of the axis of thefingers ( or thumb) and a lines at the crotch, midwaybetween the base of the adjacent fingers (0'" thumb )and extendins from palm to the back of the glove.

S.6 The gloves shall have a smooth surface andshalt he free on both inner and outer surfacesfrom visual defects like patches, blisters, porosity,embedded foreign matter or other physical defectswhich may be detected at the time of inspectionor testing.

5.7 The rubber forming the gloves and also theseams. in case of gloves that are built up fromsheet, shall comply with requirements given inTable 2.

5.8 Proof ( Test) Voltale aDeI Leak_Ie Current

Each glove shall withstand the SO Hz ac proof( test) voltage (rms value) according to themethod prescribed in Annex F. The test voltageshall be applied continuously for 1 minute andthe glove shall withstand it without breakdownand the leakage current aball not be more thanas prescribed in col 6 of Table 3.

s.' Breakdown Voltage

Gloves when tested according to the methodprescribed in Annex GJ shall not breakdown atvoltage below the value shown against each typein Table 4.

NOTE - The 810vcs subjected to breakdown test aballNOT be used for electrical protection any more.

S.tO Ozoae Resiltaace

Type 4 gloves shall show no visible defects whentested in accordance with Annex H. Any visiblesigDs of ozone deterioration of the glove material,such as, cracking, pittin" breaks. etc, tball beconsidered as failure"

6 TESTS

6.1 Clasllfieatlon of Teea

6.1.1 Type Tesls

The following shall constitute type tests:

a) Thickness ( see 5.5 );b) Tensile strength ( see 5.7 );

c) Elongation at break ( see S.7 );d) Tension set ( see S.7 );e) Tensile stress at 200 percent elongation

( see ~.7 );f) Tear strength ( see 5.7 );

g) Tensile strength and elongation at breakafter heat ageing ( see 5.7 );

h) Puncture resistance ( see 5.7 );

j) Moisture absorption ( see 5.7 );k) Nitrogen content ( for natural rubber only)

(see 5.7);m) Ash content (for natural rubber only)

( see 5.7 );n) Proof voltage and leakage current

<;see 5.8 };p) Breakdown voltage ( see 5.9 ); andq) Ozone resistance (for type 4 only)

( see 5.10 ).

6.1.1.1 Five samples shall be submitted fortesting. The testing authority shall issue a typeapproval certificate, if the gloves are found tocomply with the requirements as given in 6.1.1.

6.1.1.1 In case of failure in one or more typetests, the testing authority may call for freshsamples not exceeding twice the number oforiginal samples and subject them to the testes)in which failure occurred. If, in the repeat tesns)no failure occurs, the tests may be considered tohave been satisfied.

6.1.1 Acceptance Tests

The following shall constitute acceptance test:

a) Thickness ( see 5.S ),b) Tensile strength and ultimate elongation

(U~ 5.7).c) Puncture resistance ( see 5.7 ).d) Moisture absorption ( see5.7 ).e) Proof voltage and leakagecurrent (see 5.8).f) Breakdown voltage ( see 5.9 ).

6.1.2.1 The number of samples for acceptancetesta shall be as specified. However, a recom­mended plan of sampling is liven in Annex 1.

6.1.3 Rautine Tests

a) Thickness (see 5.5 ).b) Proof voltaic and leakasccurrent(,ee 5.8).

2

IS m«, 1991

Table 2 Requirement. lor Material Formlul the Glo••(Claus, 5.7 )

81No.

Characteristic Requirement,.-- A ~

Type 1 °fypcl 2, 3 & 4

Method of Test, Ref to~---- A ~

Annex Otherof This Standard

(1) (2)

i) Tensile strength, MPa, Min

i i) Tensile stress at 200 percentelongation, MPa, Mill

iii) Elongation at break percent. Min

iv) Tear strength, kN/m. Min

v) Tension setl), percent, MQ~

vi) Moisture absorption mg/cm', Max

( 3 ) (4 )

17 )0

2 2

600 500

14 14

20 25

5 5

80 90

80 80

vii)

viii)

ix)

Change in tensile strength, afteraccelera ted ageing at 70 ± 2°Cfor 168 h percent of original , Mill

Change in elongation at break,after accelerated ageing at70 ± 2°C or168 h, percent ofortginal. Min

Puncture resistance, kN/m 18 18

( 5 )

D

E

(6)

3400 ( Part 1 ) : 1981

do

do

3400 ( Part 17) : 1974

3400 ( Part 13 ) : 1983

3400 ( Part 4) : 1987; and3400 ( Part 1 ) : 1987

do

x) For natural rubber only

8) Nitrogen content, percent of 0'2 3708 ( Part 8 ) : 1986dry rubber content, Max

b) Ash content, percent, Max 1"0 3708( Part 9) : 1986

1) Extend the sample to 100 percent elongation for a duration of to minutes and recovery time of 30 minutes thenmeasure the final length between the bench marks,

Table 3 Proof ( Test) Voltage aDd Leak-Ie CurreDt Requirements( Clause S.8)

( J ) (2 )

i) 1

Ii) 2

iii) 3

iv) 4

SINo.

Type 01Glove

Working Voltage Proof ( Test) Leakage Current Leakage ('urrfnt( rms ) of Gloves, Voltage ( rm, ) ( rIllS ) at Work.. ( rau ) at Proof

AJax ing Voltage, VoltageMat

V V (LA rnA

( 3 ) ( 4) ( S ) ( 6)

650 5000 400 ..1 100 JOOOO 600 8

7 SOO 17000 4000 14

17000 2S 000 8000 16

Table 4 A.C. Breakdown Voltage Requirementsi Clause 5.9 )

SINo.( 1 )

i)

H)

iu)

iv)

T)'pe of Glove

( 2 )

1

2

3

4

3

MlnlDlb. BreakdownVoltage ( V ) ( rIAl ), Mill

( 3)

6000

12000

20000

30000

IS 4770 : 1991

7 PACKING AND MARKING

7.1 Packia.

The gloves may be packed in polyethylene baasand sealed or as agreed to between the purchaserand the supplier.

NOTE - Materials .. such as copper. manganese andsubstances which are oily greasy Or farry in naturehave deleterious effect on rubber. Containers withinternal surfaces made or such materials should,therefore be avoided.

7.2 Marking

The gloves shall be marked indelibly at the backwith the following information:

a) Size and type of glove;

h) Maximum "working potential in bolts,followed by the word 4workina· in brackets;

c) Indcntiflcation of the source of manufacture;and

d) Month and year of manufacture.

7.2..1 The gloves shall be colour coded as givenbelow to indicate the rated potential:

Black for Type 1

Blue for Type 2

Green for Type 3

Red for Type 4

7.1.2 The gloves may also be marked with theStandard Mark.

8 TIME LAPSE BETWEEN RECEIPT OFMATERIAL AND TESTING

8.1 For all the test purposes, the minimum timebetween vulcanization and testing shall be 16 h.

8.1.1 For product tests, whenever possible, thetime between vulcanization and testing shouldnot exceed 4 months. In other cases. tests shallbe made within 2 months from the date of receiptof the product by the customer.

9 TEST PIECE

9.1 Wherever possible, for all tests, teat piecesshall becut from the finished article. Where thisis not possible, the manufacturer shall providetest slabs from the same batch of rubber com­pound and vulcanized to the same degree and inthe same manner as that of the rubber fromwhich gloves have been manufactured.

IS 4770 : 1991

ANNEX A( Clause 5.3 )

RECOMMENDED DIMENSIONS FOR DIFFERENT SIZES OFRUBBER GLOVES FOR ELECTRICAL PURPOSES

A-I The recommended dimension of various parts of Type I glove shown in Fig. I are given inTable 5.

x

.1.

SECTION 88

SECTION 00-3-'

-E- F__

SECT rON x XEND VIEW OF THE TIP

OF THE FINGER

( SSECTION CC

L~uS

SEC110N SHOWING THER.M.OF THE GLOVE

A

IN M L-1

E -k-....J"o!.' .! r-t't'G" ~-==",..-1-

o

c

A

_ .. .. _ ~:a. ....................... __

r8

p

I

FlO. I DIMENSIONS FOR RIGHT HAI'tD RUBBER~ GLOVE (TYPE I)

Table 5 Recommended Dimensions For Type 1 Glons(Clause A-I)

51 No.( I )

De8eriptlon(2)

Dlmenaion(3)

rom

Toleraace( 4 )mm

1 Perimeter at AA 210 ± 32 Perimeter at BB 185 ± 33 Perimeter at CC 240 ± 34 Perimeter at DD 205 ± 3S Circumference at E 60 ± 26 Circumference at F 63 ± 27 Circumference at G 6S ± 28 CIrcumference at H 70 ± 29 Lenlth at J 6l :i: 2

10 Leogth at K 120 ± 211 Length at Land N 72 ± 212 Length a1 M 82 ± 213 Lcn.lh at 0 62 ± 214 Len.th at P 280 ± 3IS Length at Q lOS ± 316 Length at k. 9 :f:: 1

NOTE - Ad the dimensions given here are outside dlmensions, Circumference at E. F. G and H IS to bemeasured at a point S mm less than the lenath of the respective finllcr as measured from the tip.

5

A-2 The recommended dimensions of various parts of Types 2 to 4 glove shown in Fi., 2 are givenin Table 6,

E

"-~-'"

J

-~~- ---FIG, 2 OUTLlNB OF GLOVS AND RSCOMMENDED INTERNAL DIMENSIONS (TyPES 2 TO 4 )

Circumference at

Len,th at

Tahle , Recommended Interal DtmensioDS( Clause A-2 )

Description Size~_________---A____________~

8 9 11( 1 ) ( 2) (3) ( 4 )

mm mm mm

1.4 2200 235'0 270'0B 2.20'0 235'0 270'0e l ) 58'0 62'0 70'0

JDI) 60'0 65'0 "'0£1) 55'0 60'0 70'0NI, 700 80'0 90'0

Wrist. Min 165'0 2"'0 265'0a.untle'. Min 355'0 355'0 355'0

1K 65'0 70'0 80'0L 75'0 80'0 90'0M 55'0 60'0 67'0pi) .S'O SO'O 55'0

> i 1100 11"0 130'0

J28'0 30'0 33'0

T '7'0 60'0 65'0U 110'0 178'0 195'0V 9'0 9'0 JO'O

I) Circum!oreaco i. measured half-way between crotGb and tip,

') Applies to built-up Ilovel only,

6

IS 4770 : 1991

ANNEX B(S'ee Foreword)

CARE, MAINTENANCE, INSPECTION, RE-TEST AND USE OF RUBBER GLOVES FORELECTRICAL PURPOSES

0-0 GENERAL8-0.1 This annex relates to the maintenance ofgloves after purchase.

D-I STORAGE

Each pair of gloves shall be stored unfolded in aseparate container') in a dry, dark and cool placewhere the temperature is preferably about 27 ±2°C. Gloves which have been issued for servicebut are not actually in use should be kept in theircontainers. which should not be used for anyother purpose, or in such a place that they willnot be easily subjected to mechanical or chemicaldamage.

B-2 ISSUING FOR USE

Gloves intended for linemen and outdoor workersshould be issued in a protective container freefrom grease and oil, and of a type suited to theclass of work for which they should be used.When the gloves are to be kept in tool boxes,they may be kept in fibre, wooden or othersuitable material containers in order to protectfrom sharp tools or oils rags or cloth. Glovesissued for the sole purpose of emergency use shallbe kept in waterproof containers.

8-3 EXAMINATIoN BEFORE USE

8-3.1 Before being ~ used, every glove shall besubjected to visual ~xaminatioll inside and out­side ( the inside is liable to be cut by finger nails ).If, as a result of thl' examination, erther of thegloves is considered unsafe, the pair should besubmitted for re-test.

8-3.1 Air Leakage Test

Subject each glove to air leakage test by grippingthe cuff in each hand swinging the glove arounditself so as to roll up the cuff and retain the airin the glove, Glove found defective or suspectedto be defective shall not be used.

8-4 PRECAUTIONS IN USE

B~4.1 Gloves shall not be unnecessarily exposedto heat or light or allowed to come into contactwith oil, grease, oil of turpentine, motor spirit orstrong acid.

8-4.1 When protector gloves are used. they shallbe worn over the rubber gloves. If the protectorgloves become damp. oily, or greasy. they shouldbe removed. Protectors should be removed fromthe rubber gloves when these are not in use.

1) Certain matcnals, such as copper J manganese andsubstances which are oily. greasy, Or tarry in naturehave a deleterious effect on rubber. Containers madeof or contain! 01 such materials on their interior SUf­faces should. therefore, be avorded,

7

8-4.3 Gloves become soiled by different materialslike dust, insulating compounds, paints. corrosionproducts of copper (overhead lines) andoccasionally by transformer oil.

8-4.4 Dust may be removed by washing andbrushing with soap and water. Gloves that havecome in contact with copper have to be cleanedcarefully by means of washing and brushing.Gloves thus cleaned should be rinsed thoroughlywith clean water and have to be dried thoroughlyby means of heated air (maximum temperature65(JC ) and dusted with talc powder.

8-4.5 For removing Insulating compounds. paintsand other materials the gloves should be quicklywiped with solvents like acetone, carbon tetra­chloride or trichloroethylene and then immediatelywashed and treated as in 8-4.4. Motor spirit,petroleum hydrocarbon solvent shall not be usedto remove such compounds.

8-4.6 Any glove which becomes wet in use shallbe thoroughly dried. Where heated air is blowninto the glove. it should not cause the temperatureof any glove to exceed 65°C.

u-s INSPECTION AND RE-TESTING OFGLOVES

Gloves issued for frequent use shall be re-testedintervals of not more than 6 months. Glovesissued for occasional use shall be re-tested afteruse or in ant case at intervals of not more than12 months. ~ Gloves kept in stores should bere-tested at intervals of not more than 12 months.Surface defects, not visible on initial acceptancetest and inspection may develop with use, resultingfrom the breaking of blisters in the rubber orfront foreign matter breaking through the surface..All gloves which show any defects when returnedafter use shall be rejected and destroyed. Eachglove shall be stretched by hand to ensure thatmechanical strength is adequate, Those whichappear to be in good condition shall be re-testedas follows:

a) The gloves are given a single electrical testin accordance with the appropriate testpotential as specified in Table 3 (that is.according to the rated potential) and inthe manner described in Annex F.

b) In the re-test no glove shall break down orshow a current leakage in excess of themaximum specified in Table 3 whichever isappropriate.

IS 4770: 1991

Only those gloves that pass this test shall be B-6 SALVAGEaccepted as satisfactory and shall then be trea'edin the manner described in 8-4.6. all other gloves When only one glove of a pair is rejected, theshall be rejected and destroyed. other where possible, may be re-mated with a

similar glove of the same size and make; theresultins palr, after re-testing, may be placed inserviceable stock. No glove shall be turnedinside out for re-mating.

ANNEX C

( Clause 5.S )

MEASUREMENT OF ·THICKNESS

c-i APPARATUS

C-l.1 Dial Gaule

A micrometer dial sauget graduated so as toread accurately to the nearest 0'02 mm.

C-l.l Procedure

Measure the thickness of each glove at not leslthan four points at tho back and four points onthe fore part of the palm. Take also measure­ments at one .or more points in the crotch betweenthumb and index finger and in the crotches bet­ween the finger.. The thickness measured shallfall within the maximum and minimum limitsspecified in Table I.

ANNEX D

[ Table 2, SI. No ( vi ) ]

METHOD OF TEST FOR MOISTURE ABSORPTION

Increase in mass mrJcm' :a (M. - Ml ) I 000~ A.

whereMl == maSI, in I. of conditioned specimen:M. == ma••, in I, of specimen after im­

mersion; andA .. area, in em't of specimen.

70 ± ioe for 48 ± 2 b supported on edge andentirelyimmersed. At the end of the period, removethe specimons from the water and cool at roomtemperature. Remove ailiurface water with a drycloth, and weigh the specimens to the nearest0·001 I immediately.

D-4PROCEDURE

D-l.2 Olen

Capable of DlaintainiDI uniform temperature of D-5 CALCULATION AND REPORT50 ± 3·C and 70 ± 1°C.

Condition three speeimenl or materials in air ovenfor 24 h at SO ± 3°C, cool in a desiccator andimmediately weigh to the nearost 0·001 a. The report shall include the 8veralc for three

specimens .a (ollows:

a) Increase in man durioa immersion, andb) Any observations as to warpiDJ. crackina

or change in appearance of specimens.1).4.1 Place the conditioned specimens in acontainer of distilled water at a temperature of

D-l APPARATUS

D-I.l ADalytieal Balaace

Capable of weighing to 0·00 I g.

1>-2 TEST SPECIMEN

A bar 75 mOl x 25 mm having the tbickne'l ofmaterial.

1>-3 CONDITIONING

8

IS 4770 : 1'91

ANNEX E[ Table 2, 81 No. ( ix ) ]

METHOD OF TEST FOR PUNCTURE RESISTANCE

E-l APPARATUS

E-l.1 Universal Test Macblne

of minimum capacity 1 kN with an accuracy of.:tIN

[-1.2 Two Flat Meta) Plates Having ConcentricOpenings

One of the plates shall have a Circular opening6 mm In diameter to allow the passage of astainless steel needle. The other plate shall havean opening 25 mm In diameter to provide a fixedfree area through which specrmen may elongatewhile being subjected to the pressure of theneedle pomt The edges of the opening shall berounded to a radius of approximately 0 R mrn

The needle shall be made from 5 mm diametertype 304 stainless steel rod. The rod shall bemachined at one end rounded to a radius of0'8 rom

E-2 TEST SPECIMEN

At least 40 mm x 40 mm size.

E-3 PROCEDURE

POSItion the needle perpendicular to the specimenon the tensile testing machmg so that the pointcontacts the specimen through the small hole Inthe plate. Drive the needle through the specimen ata rate of approximately 10 mm/sec. Measure themaximum force required to perform the punctu­ring operation to the nearest 2 N

ANNEX F( Clause 5.8 )

METHOD OF TEST FOR PROOF (TEST) VOLTAGE AND LEAKAGE CURRENT

r-r VOLTAGE MEASUREMENTS

F-J. t Apparatus

The apparatus shall eonsrst of the following

a) A source of alternanng clectncal current.approximately 50 cycles per second and ofapproximately sine wave-form

b) A step-up transformer having one end ofthe secondary Winding earthed The ratioof the peak potential to the rrns potentia)of the secondary Winding of the transformerIS Within the limits of V2 ± 5 percent ofv/2-( 1-34 to 148) under the test condi­tions The rating of the testing set IS notmore than 2 kYA and not Jess than 1/2kVA per glove being tested.

c) SUItable controlgear and means for Inputvoltage variation.

d) Potential ( Voltage) Measuring Equipment>­This may be a peak or other typo of volt­meter connected across the input winding,output winding or a special voltage Windingor across a porting of the output Winding.Any instrument used should be cahbratedagainst a sphere gap in parallel With a loadequivalent to the normal test load. Anyrrns Instrument may. however, be calibratedagainst a peak voltmeter, provided thatthere IS adequate evidence that the latter ISfree from errors due, for example, tofrequency changes, brush discharger or re-­entrant waveforms ( see IS 1876: 1961 ).

e) A rmllrammeter or other current-measuringequipment.

f) A bath in which the gloves may be im­mersed 10 tap water at a temperature of27 ± re.

g) lnsuladng clips for suspendmg the gloves

F-l.2 ProcecIPre

F-l.2.1 Prepsratton for Test

Clean before the commencement of each test, thecuffs of the gloves With Industrial alcohol In orderto prevent flash-over occurring through waterseeping along the chalked surfaces. Immerseeach glove In tap water ( at 27 ± 2°C) up to 40mm from the edge ot the cuff and fill WIth tapwater to the same level. Immerse the glove Inthis way for a period of I hour before test, Holdthe glove in posiuon by means of insulating clips.The water Inside and outside the glove forms theInternal and external electrodes respectivelyConnect the Inner electrode to the hrgh voltagesupply by means of chains or wires Earth theexternal electrode through the milhammeterCIrCUit.

F-I.l.2 Raise to potential apphed across the testelectrodes from zero to the approxrmate rms testvalue as rapidly as IS consistent WIth its valuebeing observed 011 the measuring Instrument butnot less than 1 ltV per second.

IS 4770 : 1991

F-l.Z.2.1 Test the gloves for the leakage current set up from the working potential to the testat the working voltage as indicated in Table 3 potential indicated in Table 3 and maintain at thatdepending on the types of gloves and maintain level for 1 minute. The leakage current shall notthis potential for one minute. Test for only exceed the value mentioned for such class ofbreak-down in voltage and measure the leakage gloves in Table 3. Gloves which fail in abovecurrent. The gloves shall not pass a current more test should be rejected.than specified in the said table for such classduring the last IS seconds. Destroy the gloves F-l.3 Resultswhich fail in above test.

Report any sudden fall in voltage and read theF-l.2.2.2 For such gloves which meet the require- leakage current from the reading of the currentmenta in F-l.1.1.1 increase the voltage in the same measuring instrument during the last IS seconds.

ANNEX G( Clause 5.9)

METHODS OF TEST FOR BREAKDOWN VOLTAGE (BDV)

G-l APPARATUS

G-l.1 The apparatus shall consist of thefollowing:

a) A source of alternating electrical current,approximately SO cycles per second and ofapproximately sine wave-form.

b) A step-up transformer having one end ofthe secondary winding earthed. The ratioof the peak potential to the rms potentialof the secondary winding of the trans­former is within the limits of ";2 ± S per­cent of V2 ( 1'34 to 1-48) under the testeonditlons. The rating of the testing set isnot more than 2 tVA and not Jess than 1/2kVA per glove being tests.

c) Suitable controlgear and means for inputvoltage variation.

d) Potential ( voltage) measuring equipment.This may be a peak or other type of volt­meter connected across the input winding,output winding or a special voltage windingor across a porting of the output winding.Any instrument used should be calibratedagainst a sphere gap in parallel with a loadequivalent to tho normal test load. Anyrms instrument may. however, be calibratedagainst a peak voltmeter, provided thatthere is adequate evidence that the latter i.

free front errors due, for example. to frequ­ency changes, brush discharges or re­entrant wave-forms (see IS 1876: 1961 ).

e) A milliammeter or other current-measuringequipment.

f) A bath in which the gloves may be im­mersed in tap water at a temperature of27 ± 2°C.

g) Insulating clips for suspending the gloves.

G-Z PROCEDURE

G-2.1 Preparation for Tat

a) Clean the cuffs of the gloves with industrialalcohol before the commencement of eachtest in order to prevent flashover occurringthrough water seeping along chalkedsurfaces.

b) Immerse each glove in tap water at 27 ±2°C to a depth of 40 mm from the edge ofthe cuff and fill with tap water to samelevel.

G-2.1 Apply telt voltage at 10 percent of theexpected BDV of the glove and increase it at arate of lkV/sec until breakdown occur or until1·2 times the expected breakdown voltage halbeen reached. Record the maximum voltageobserved at breakdown.

10

IS 4770 : 1991

ANNEX H

( Clause S.to )

METHOD OF TEST FOR OZONE RESISTANCE

H-l APPARATUS

See 3 of IS 3400 ( Part 20 ) : 1977 •

distance to prevent flash-over between the foil andthe metal test. Connect electrode wire to thealuminium foil.

NOTE - The rate of ozone degradation i. inver.eJyproportional to the relative humidity of the surround­ing air. Empmcal data indicate, however, that visibleozone effects are evident over a broad range of ambienthumid.tles under these test conditions.

H-3.3 Determine the ozone resistance of thospecimen qualitatively by inspection. after 1 hourexposure period in the test apparatus at the IS kVpotential. Test at least two specimens from eachsample glove selected. Take two specimens fro01the same section of the sample glove.

H-2 TEST SPECIMEN H-3.2 Energize the outer electrode (metal foil )100 mm x t50 mm specimen of the glove to 15 kV potentia 1 from a suitably rated potentialmaterial. transformer energized from its low voltage wind-

ing through a conunuously variable auto trans­former. Incorporate an over current protectingdevice into the low voltage control circuit for pro­tection in case of an electrical breakdown.

H-3 PROCEDURE

"-3.1 Suitably condition the specimen by keepingflat for 24 h. Drape the specimen over a 25 mmdiameter metal tube of sufficient length to com­pletely underlie the specimen, while possessingadditional length for the required mountingsupports. Electrically ground the metal tubingclamp the free ends of the specimen beneath thetubing along the upper half of the cylindricallyshaped electrode surface.

H-3.1.1 Place a piece of flat, 'aluminium sheetfoil, approximately .50 to 100 rnrn, over the drapedspecimen so as to provide adequate separation

ANNEX J

( Clause 6.1.2.1 )

SCALE OF SAMPLING,

J...1.3 All the gloves selected according to J-2.2shall be examined for size, length and thickness.Any glove failing in one or more of these charac­teristics shall be considered as defective. If thenumber of defectives found in the sample is lessthan or equal to the corresponding permissiblenumber given in col 3 of Table 7, the lot shall bedeclared as conforming to these requirements.otherwise 110t.

Starting from any glove in the lot, the gloves shallbe counted as 1.2 ... ", r and so on in one order.Every rth glove thus counted shall be withdrawnto constitute the sample. where r is the integralpart of Nln ( Nand n being the lot size and thecorresponding sample size respectively). Thisprocedure shall be followed till the requirednumber of gloves for the sample are obtained.

J-1.1 The number of gloves to be selected atrandom from a lot shall depend upon the size ofthe lot and sball be in accordance with col 1 and2 of Table 7.

J-l LOT

J-2 NUMBER OF TESTS AND CRITERIAFOR CONFORMITY

J-2.2.1 The gloves to be selected from the lotshall be chosen at random. In order to ensure

J-l.l In a consignment of all the gloves of the the randomness of selection, random numbersame type, and manufactured from the same type tables shall be followed.of rubber under essentially similar conditions of ~

production shall be grouped together to constitute In case random number tables arc not available,a lot. the gloves may be selected from the Jot in the

following manner:J·J.l.1 Samples shall be selected and tested fromeach lot separately for ascertaining its confor­mity or otherwise to the requirements of thisspecification.

J-2.1 Each glove in the Jot shall be examined forworkmanship and tested for leakage current. Thegloves failing to meet the requirements for work­manship or leakage current shall be rejected andonly those which pass in these requirements sballconstitute the lot for other tests.

11

IS ."0: 1991

Table 7 Scale of 8a.,1101 and Pennlsslble Number of DefeetlVfS( Clause J-2.2)

No.orGlov. For Slu, I.eDlth and Thlcknes. For Remalnlo. TestaIn tbe Lot ~-~-----~------~ ~-------~--------Semple Permis.ible No. of Sub-sample Permissible No. of

Size Defectives Size Defectives( 1 ) ( 2 ) ( 3 ) (4 ) (.5)N n n

Up to 100 8 0 {101 to 1.50 13 0 3 0lSI to 300 20 0

301 to .500 32 1 { 6 0501 to 1000 SO 2

1001 103000 80 3 { 9 03 001 lind above 125 S

J-2.3.1 In the case of those lots which have beenfound unsatisfactory according to J-2.3, all thealoves may, depending upon the agreement bet­ween tbe purchaser and the supplier, be inspectedfor these characteristics and the defective onesremoved.

J-2.4 The lot havin, been found satisfactory forsize, length and thickness shall be tested for allthe other tests. For this purpose a sub-sampleof size given in col 4 of Table 7 sball be taken atrandom and first subjected to the minimum break­down vllJtage test. All tbe gloves in the sub­sample shall pass the test for the lot to bedeclared as satisfactory.

J-1.4.1 For subjecting to mechanical tests, thesub-sample shall be divided into groups of three

GLOVE 1

gloves. The test specimens shall then be takenfrom .the glove in accordance with J-3.t andtested. A glove shall be considered as defectiveif any of the test specimen, taken and tested,fails. The lot shall be considered al satisfactory,if none of the gloves ia found defective.

J-3 SAMPLING POSITION

J-3.1 TJ:ie sam.pling position for taking specimensfor various tests shall be as shown in Fig. 3. Thegloves shall be slit up outer finger side and laidwith outside surface up for stamping cut testpieces. The number of test pieces and code forthe various test pieces are indicated in Fig. 3 andTable 8.

GLOVE 2

GLOVE 3

FlO. 3 POSlnoNS FOil STAMPING OUT TnT SPECIMENS FOI. MECHANICAL PaOPEllTIES

12

SINo.

Properties to be Tested

Table 8 Sampllac Position( Clause J-3.1 )

Code for theTest Plec"

IS 4770: 1991

Test Piece No. as IndicatedIn Fig. 3,.-.. _. ..A...-_.... •"

Front Back

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

i) Tensile strength and elongation at TBA. 1.19 6,11,17break before ageing

11) Tensile strength and eloagauon at TAli. 8,20 4,1418break after aaeina

iii) Tension set P 13,15 7

iv) Tensile strength of 200 percent TE 2 10,21clonaation

v) Tear strength TS 5,16 3

vi) Moisture absorption Mil. 9,12 22

vii) Puncture resistance PR 23 24

13

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Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; 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 amendmentsor edition by referring to the latest issue of'BIS C4talogue' and 'Standards: Monthly Additions'.

This IndianStandard has been developed from Doc: No. pen 13(924).

Amendments Issued Since Publication

Amendment No. Date of Issue Text Affected

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