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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.

!"#$% '(%)

!"# $ %& #' (")* &" +#,-.Satyanarayan Gangaram Pitroda

Invent a New India Using Knowledge

/0)"1 &2 324 #' 5 *)6Jawaharlal Nehru

Step Out From the Old to the New

7"#1&"8+9&"), 7:1&"8+9&")Mazdoor Kisan Shakti Sangathan

The Right to Information, The Right to Live

!"# %& ;

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IS : 2925 - 1984

(Reaffirmed 2010)

REAFFIRMEDIndian Standard

SPECIFICATION FOR

INDUSTRIAL SAFETY HELMETS

(Second Revision)

Fourth Reprint JUL Y 2007(Including Amendment Nos. 1,2, 3 & 4)

UDC 614.891.1: 658.382.3

I 2005

Gr 4

Copyright 1985

BUREAU OF IND IA N STA ND A RD S

MANAK BHAVAN, 9 BAHADUR SHAH ZAFARMARGNEW DELHI 110002

January 1985

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IS : 2925 1984Indian Standard

SPECIFICATION FORINDUSTRIAL SAFETY HELMETS

Second RevisionFire Figln ing Sectional Cornm it ter-, 22

ChairmanSI lHf G. B. ~ O N

Sector 12, 1242, R. K. Pura m ,New l )p lh i 110022Member j

SJJHl A. N. AHL U \ V L I \Rf r tsen

I he Institution of Fire Engineers Ind ia ,New Delhi

of

ofivernrnent

SHR l B. R . . t \1EIIT,\ AlltrnateSHRI S. R. BANS. \L St ce] Aut ho r i ty of India ( lioka ro Stf p Plant) ,Bokaro Steel Cit\CH IEF Fin ; ) F ~ I C F : H , Municipal Corporario of f)pJhi, De-lhi

SHI t l R. K. Ih IAHP\vA. J ( AlternateSuur K. K. DAS GUP rA West Bengal Fire Services.West Bengal, CalcuttaGENKRA L Ministry of Ra ilwa v sV U T Y {NRPE:C rOHRPSE

ASSiSTANT SECURITY YV1CKH. ( FIRM ,NORTHEH N RAIL AY ( AlternateSn u r V. P. DE \VAN Ministry of Defence ( 1)(;1 )Lrr-CoIJ V. R. BAN All AT I ( Alternate )

SH l { I R. R. DHORLEY Hhabha Atomic Research Centre, BombayDlI t:E( TOR ( F IR l : SERVICEH ) Home (Police) Department, Governmenti\ndhra Pradesh. Hyderabad

DEPUTY Dll{J;:CTOH F I I {ESERVleER Alternate

DJHECTOR GENERAL Horne Department (Fire Se-rvir c },of Tamil Nadu, Madras ~ O V i r n T n e n tD l a ~ U T Y DIHECTOR ( Alternate

FIRE AnvIsER Ministry of Home AffairsSHRI A. K. GUP l A Central Building Research Institutr- ( CSIR ),RoorkeeSHf t l J. S. J A M ~ H J - ~ D . l J Steelage Industries Li m i ved Minimax Div ision },Bombay

SRR I C. GHAN. \R A,J ( AlternateContinued on page2 )

~ p y r i g h t )985BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian opyri ht Act (XIV of ]957) andreproduction in whole or in part by any means except with written permission of th epublisher shall be deemed to be an infringement of copyright under the sa ill Act.

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IS : 2925 1984( Continued from page 1

Newage Industries, Surrndranagar ( Gujarat )

SHi l l 1 . N. PANOJ lSmu P. N. P \ ~ J I \ J J

At embers RepresentingSl fRI P. ( lJANN A jayashree Textiles and Industries, RishraSHRI V. V. KI;\ JMATK.\n Oil and Natural Gag Commission, Dehra DunS aR I S. N. KUNDfJ Fire and Safety Appliances Co, CalcuttaMAN:\OI lS O Drrucorou Avon Services ( P A ) Private Ltd, Bornbay

f E r .HN IC , \ L E X E C , ~ T I V E ( AlternateSL lHt M. MUKJI} ;R.J Steel Authority nf India (Rourkela Steel Plant) ,Rourkela

Snn l C. D. S H l t ~ A i AlternnteSUHI V. B. N Ih .vxt Municipal Corpora tion of Greater Bombay( Bombay Fire Brigade ), BornhayCentral I ndus tr ia l Secur ity Force (l\linistry ofHorne Affairs ), New DelhiDire ctorate General o f Supplir-s and Disposals,New DelhiSuru P. II. SF,THN.\ Koovcrji Devshi and Co Pvt Ltd, HornbavSrru r N. T. P. \N ,nV . \N I AlternateSHRI D. K. SJRKAl t Synthetics and Chern ica ls Ltd, BareillySaR I C H A ~ n n . A K M. SH A H Zenith Fire Services, Bombay

SUR ] M. 1 1 SH AU ( AlternateSHRIJ. V SH HSHRI B. J. SHAl l i Alurnate

SURf M. B. Srxo n Ministry of Defence ( R D )SHRJ K. R\:\t \ ( ;1 ( . \ ~ D R : \ ( Alternate

SnRI r . \ l n1 S Ht Surex Production and Sa lcs Pv t Ltd, CalcuttaSI IRI SUSlJIL K u ~ I ~ H Directorate General of Technical Development ,New o-u.:Tariff Advisory Committee, BombayHHI J. N. VAK I L

SHIt I K. RAVI ( AlternateSHRIS.VENKASWAMYSHRI B. V. WAOf.,l; Directorate General of Civil Aviation, New DelhiUrban Development, Public Health, HousingDepartment, Government of Maharashtra

SURY V. 1-1. M A D K A l l , , ~ n ( A l t e r ~ , ) .SaRI G. RAMAN , Director General, lS I ( Ex officio Member )Director ( Civ Engg )Secretary

SURI K. M. MATHCl tSenior Deputy Director ( Civ Engg ), lS I

Helmets Subcommittee, BDC 22 : 5SHItt S. K. ARORA Bureau of Police Research and Development,New DelhiFIRE ADVI::iEU. Ministry of Home AffairsSH1U P. P. JAIN The Mines Service Corporation, Asansol

SHRI A. P. AOARW AL ( Alumat )JOINT DIRECTOR OF MINES SAFETY Directorate General of Mines Safety, DhanbadSHRI RAMBl8D KAPOOR New Steel Bird Industries, New Delhi

SURI A : ~ H O K KAl OOH, ( AlurnauCvntinu,d on ill 16

2

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MEN MENT NO

TOJ NU RY 1988

15:2925-1984 SPECIFIC TION FOR INDUSTRI LS FETY HELMETS Second Revision)

Page clause 5.1, l ine 11) Add thefollowing words af te r the w o r d ~ c hof the two

age 5 J clause 5. 1 la s t l ine) Add thefollowing words af te r the word s ha l lnot less than 180 2 and

Page 15, clause H-2.1, l ine 2) Add thefollowing words a f t e r the word o fsodium chloride in

BDC 22)

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AMENDMENT NO. 2 SEPTEMBER 1999TOis 2925: 1984 SPECIFICATION FOR INUUSTRIALSAFETY HELMETS

Second RevisionPage 4, cl use 2.3.1 Insert the following at the end of sub-clause:

and the hC3.dband may or may no t he.continuous when Napestrap is provided.

CED 22)

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MENDMENT NO 3 DECEM ER 2000TOIS 2925: 1984 SPECIFICATION FOR INDUSTRIALSAFETY HELMETS Second Revision

Page 3, clause 0.4 - Delete clause 0.4.Page 5, cl use 4.1 - Subst itute the following for the existing:

Helmets shall be in sizes 520, 530, 540, 550, 560, 570, 580, 590 and 600mrn. These sizes may be generated ou t of one or more shells or on e of morehead bands. The size adjustment range shall be clearly marked on thehelmet.

Page 9, clause lO.I b ] - Substitute Range/Size for Size .Page 10, Appendix A - Delete. Page 13, Appendix G - Substitute following Appendix G for theexisting:

APPENDIX G Clause 8.3

M ET HO D O F TESTING F I ~ M M I L I T Y RESIS1 ANCEG-I SAMPLEG-I.l The samples for testing shall be selected as given in 9.1.G-2 BURNERG-2.1 Burner shall be operated with the valve so as to ge t a flame height of150 rom. Satisfactory operation of burner shall be checked by inserting in theflame, the bare copper wire of 0.71 mm diameter having a free length of notless than 10 0 mm in position normally occupied by low edge of the test piece,that is, 50 mm above the burner and reaching farther edge of the flame. Thewire should no t take more than 6 seconds to melt.

]

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Amend No.3 to IS 9Z : 1984G 3 PRO E UREG-J.l With the helmet upside down and the burner angled at 450 to thevertical. The end of the flame shall be applied to the outside of the shell atany suitable point between 50 and 100 mm from the crown for a period of 10seconds. The plane tangential to the test point shall be horizontal.G 3.2 The shell shall be examined for flamming 5 seconds after removal of theflame.

CEO 22

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AMENDMENT NO. 4 MAY 20021IS 2925: 1984 SPECIFICArrION FOR INDUSTRIAI.JSAFE1 Y HELMETS

Second Revision( ge 3, cl use 0.5 ) - Insert the following new clause after 0.5:

0 6 In the formulation of this standard, due weightagc has been given tointernational co-ordination among th e standards and practices prevailing indifferent countries in addition to relating it to the practices in the field in thiscountry. The performance requirements gi yen in this standard ar e technicallyequivalent to those given in ISO 3873.

~ E 22 )

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IS : 2925 - 1934Indian Standard

SPECIFICATION FORINDUSTRIAL SAFETY H LM TS Second evision

o r R EW R n0. 1 This Ind ian Standard Second Revision) wa s adopted by th eIndian Standards I ns ti tu ti on o n 31 May 1984, after th e d ra ft finalizedby th e Fire Fighting Sectional C om mittee h ad been approved by th eCivil Engineering Division Counril.0. 2 Helmet is on e of th e most important items o f personal protectiveequipment used by workers for protection against head injuries whichm ay be caused by falling objects in rnany industries, for example,m in in g, t un ne ll in g, quarrying, ship building, construction projects andsimilar occupations. H e a d injuries ca us ed by falling objects a re usu allyserious an d s om et im es f at al . This standard has been prepared fo rindustrial safety helm ets capable o f providing adcq u a te p ro te ct io n fromfalIing objects a nd o th er hazards commonly met with in m any industries.This standard was first published in 1964 and revised in 1q75. T hissecond revision has been prepared so as to include all th e amendmentsissued so fa r besides relaxing n u m b er o f anchoring points o f cradlefrom eight to minimum four so that latest designs could also be coveredin the r ev is ed v er si on b es id es including the provision o f vc nrilation holes.0. 3 In formulating this s ta nd ar d, the Sectional Corn mittcc has takenspecial care to a vo id u nne ce ss ary rest ricti on in t he design o f safetyhelmets. I f any special h a za rd s , s u ch as chemicals, oils are likely to beencountered, th e r eq ui re me nt s o f standard should be su pplirnented byspecial requirements to afford protection a ga in st s uc h hazards.0.4 In the course o f us e o f helmets, it is advisable that at suitablei nt er va ls , t he se should be tested for the sterilization test as given inAppendix A.0.5 For t he p ur po se o f d ec id in g w he th er a particular requirement o fthis standard is c om pl ie d w it h, the final value, observed or calculated,expressing th e result of a test or analysis, shall be rounded of f inaccordance with IS : 2-1960*. T h e n um be r o f significant places retained -Rules for rounding off numerical values r ois ,

3

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IS : 2925 .. 1984in the rounded off value should be the same as that of th e specifiedvalue in this standard.

1. SCOPE1.1 This stan d ard lays down the requirements regarding mater-ial,construction, workmanship ann finish an d per for m ance r equi rem ent s o fhelmets intended to provide protection against falling objects and otherhazards which tnay be encountered in m i ni ng, t unnel li ng, quarrying,s hip b uil din g, construction projects and similar other industrialoccupations.2. TERMINOLOGY2.0 Fo r th e p urp ose of this standar d, the f ol lo wi ng d ef in it io ns shallapply.2.1 BrilD - The ri 01 surrounding the shell.2.2 C h i n s t r a p - An a dj us ta bl e s tr ap t ha t fits under the chin to securethe helmet O il th e head.2.3 H a r n e s s I he c om pl et e a ss em bl y b y m ea ns of which th e helmetis maintained in position on the head, which includes h ead b an d , cradle,etc.

2 3 1 Headband - Part of harness surrounding the head. T h e planeof lower margin o f headband shall correspond to r ef er e nc e l in e o f theheadforrn see IS : 7692-1975* .2 3 2 Anti Concussion Tapes - Supporting straps which form th e cradle. 3 3 Cradle - T he fixed or adjustable assembly compring o f

anti-concussion tapes and nape strap where provided. 3 4 pe Strap - An adjustable with respect to the shell strapthat fits behind th e head to secure th e helmet and may be integral parto f th e h ead b an d .

2.4 P eak - I he extension of th e shell above th e eyes.2.5 Shell - T h e har d smoothly finished material that provides th egeneral o ut er f or m o f the helmet.2.6 V e ntila tion H o le s - Holes provided in th e shell to permitcirculation o f air-inside the helmet.

Specification for wooden headform for testing of helmets.

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IS : 2925 - 19843. MATERIAL3.1 Shell - The shell of the helmet shall be of non-metallic materialsconforming to test requirements given in 8.3.2 Harness - The criteria for the selection of m ater ial for theheadband, anti-concussion tape, etc, is that these shall be swear-resistant ,non-irritant an-I shall not cause skin disease.3.3 Metal rts - The metal parts used in helrnets shall be eitherinherently corrosion resistant or of such metal which have been treatedfor these properties. Such par ts shall show no sign of corrosion whensubjected to test, as specified in Appendix H.

NOTF. Helmets required for use in underground mines shall have no meta I partsmade from aluminium or magnesium or their alloys.

SmallMediumLargo4 tolerance ofpermitted.

O T ~ - The size of the headband shall be measured with c ithvr a fixed ring gaugeor an expanding gauge which shall be made o f metal or by an appropr iat e hcadform.

4. SIZES4.1 Helmets shall be in the following three sizes depcnding upon therange of headband sizes. The shell shall be fitted with adjustable typeof headband in accordance with the following requirements:

Nominal the Helmet Range of Headband Siers Circumference Inside HeadbandAdjustable from500 to 540 m m540 to 590 rn II I590 to 640 r 10 mm on the size of the headband shall be

5. CONSTRUCTION5.1 The shell shall be dome-shaped. There shall not be any meta liiccomponent passing through the shell. I t shall be provided with a brimwith or without a peak. The brim and the peak where provided shall be integral part of the shell and these shall have no sharp edges,The hrim shall be continuous around the dome. The dimensions ofbrim and t he peak where provided shall be in accordance with Fig. 1.The position of ventilation holes shall be such that the central axis ofthe holes is almost horizontal when the helmet is in normal wearingposition, The diameter of any hole shall not exceed 6 mm nor theedges of adjacent holes closer than 15 m rn , The minimurn number ofholes on each side shall be not less than 3 and total aggregate area of .holes shall not exceed than e mm

NOTE - However the condi ti on of usage prec lude the positions of ventilationholes, the same rna y not be provided.5

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IS : 2925 - 19845. 2 H a r n e s s

5 2 Headband - The h ead b an d shall be not less than 30 ro m in widthand so designed that adjustrnent to any size specified in 4.1 may bereadily rn a de I t shall be securely attached t he h elm et shell andcrown straps.

5.2.1.1 In order to p ro vi de v en ti la ti on th e minimum distance o fh e a d b a n d from the shel l achieved by spacers o r otherwise shall be 5 m rne xc ep t a t the point o f g e ne ra l a d ju s tm e n t o f headband.5 2 2 Cradle - T he headband shall be fitted w it h a nt i- co nc us si ontapes se cu red at least a t 4 anchor-ing points an d forming a cradle.T h e wi

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IS : 9 5 19845. 3 C h i n S t r a p or N a p e S t r a p - T hc helmet shall Le provided eitherwith the chin strap o r nape strap.

5 3 1 Chin Strap - It shall be attached to t he xhel l, be o f at least19 m m wide, perrn anent ly fitted with a fast ening device to adjust an dmaintain tension, an d conform to th e requirements given in A ppendix D.5 3 2 Nape Strap - It shall be either an integral part or as anat t achm ent to the headband, be adjustable and have a minimum depthof 115 rnm w he n m ea su re d as in 5.3.2.1.

5.3.2.1 With th e helmet fitted on a headforrn see IS : 7692-1975* and loaded with a mass of 10 kg, th e distance b et we en t he top of th eheadform and th e b ottom edge o f th e nape strap shall be not less t han115 m m m ea su re d a t the cc nt re rear o f t he h ea df or m.5.4 L aD 1p B r a c k e t hereR e q u i r e d - T his shall be m arle o fplastic or s ui ta bl e r na tc ria l and fixed to the shell and shall satisfy th efollowing performance requirements:

T h e helmet with th e peak cut off is mounted on a wood enheadforrn and held in position. A cap lam p hook d eta ch ed fr omth e head piece o f cap l a m p is fitted into th e lamp bracket. A masso f 2 25 kg is suspended by a suitably strong cord o f 100 er n from th eouter rj rn o f the cap arnphook so that the cord coincides with thevertical axis of the mass. The mass is then raised through the sameaxis through 80 em a n d t fall freely. T w o trials being m ade ineach case. T h e bracket shall remain intact.5.5 Cab l e C l j p W h e r e R e q u i r e d - This shall be made of plasticor suitable rnaterial and fixed to th e shell and shall satisfy th e followingrequirements:

A helmet with the brim cut off partially at th e b ac k is m ountedon t he w oo den headform and held in position. A mass o f 2 25 kg issuspended by a suitably strong cord o f length 50 em Irorn the cableclip, keeping th e point o f suspension closest to th e shell. T he massis raised and le t fall freely through th e height o f 30 em; t \V trialsbeing made in each case. Th e cable c li p s ha ll r e m a i n intact.6. WORKMANSHIP AND FINISH6.1 T h e surface o f th e helmet shall be finished smooth, free from burrs;sharp edges shall be removed to ensure proper s ur fa ce c o n ta c t of al lfittings. All metal parts including rivets shall b e smooth and free fromsharp or rough edges o r projections.

Specification for wooden head form for testing of helmets.

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i s : 2925 9847. MASS1.1 T he mass of a complete helmet w ithou t attachernents and with orwithout peak (where not provided) may not exceed 400 g. If theBlass exceeds 400 g, this mass determined to the nearest 35 g shall heshown on a label attached to the helmet.8. PERFORMANCE REQUIREMENTS8.1 Shock Absorpt ion Resis tance - Helnlcts shall be tested forshock absorption y the method described in Appendix E within oneminute after subjecting them to the conditions specified in a , b and c below:

a A tern perature of 50 o for 4 hours in an oven,h A tcrnperature of - 10 2 for 4 hours in a refrigerator) andc Vater flowing over th e who le outer surface of the shell at roomtemperature fo r 4 hours at a rate of I l/rnin.No single heh nct shall, however, he subjected to more than one of

these conditions. rrhe shelJ shall not show any penetr at ion and/orcracks (separation of material) and harness shall not show anyd arnage deteriorating its function. T he force transmitted from theheadforrn to the base shall not be higher than 5 kN 510 kgf .8.2 Pene tr a tion Resi st ance - Helmet shall be tested or penetrationresistance in accordance with t he method specified in Appendix F withinone minute after s.ubjecting it to one of th e conditions given in 8.1 whichhas given worst result in shock absorption. These shall neithe r b re aknor be pierced through sufficiently to touch the headform; no integralpart shall fail Or stretch permitting the helmet to be forced down overthe headform. The s ta ti c measurement of the depth of a penetrationor dent including t he thickness of the material of the shell shall notexceed 10 rnm,8.3 FlaDllDability Resistance - Helmet shell shall be tested forftamrnability resistance in accordance with the method specified inAppendix G. The mater-ia] of the shell shall not burn with emission off lame after a period of 5 seconds following removal of flame.8.4 Electr ical Resis tance - Helmet shell shall be tested for e lect rica lresistance in accordance with t he method specified in Appendix H, andshall not show a leakage current in excess of 3 rnA.8.5 ter Absorpt ion - Helmet shell shall be tested for waterabsorption in accordance with the method specified in Appendix J, andsha ll not absorb water more than 5 percent of its mass.

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IS : 2925 19848.6 H e a t R e s i s t a n c e - Helmet shell shall b e tested for heat resistancein accordance with method specified in Appendix K , an d t he sh ell shalln ot s ep ar at e, d is to rt or soften.9. SAMPLING AND CRITERIA FO R C O N F O R MITY9.1 T h e method o f sarnpling an d criteria for conformity shall be asspecified in S 9695 ..1980*.10 . MA R K IN G10.1 Each helmet shell an d harness shall be legibly and indeliblymarked with the following information:

a M a nu fa ct ur er s n am e o r tr adc-ru ark , andb Size o f helmet.10.1.1 The product may also be rnarked with Standard Mark.

10.t. 2 The use of the Standard Mark is governed by the prov s o s of theBureau of Indian Standards Act, 1986 and the Rules an d Regulations madethereunder. Th e details o f conditions under which the licence for the use of

j Standard Mark may be granted to manufactures or producers m y be obtainedfrom the Bureau o f Indian Standards.11. INSTRUCTIONS11.1 Each helmet s ha ll b e c le ar ly an d indelibly marke d as follows eitheron helmet shell or on a l ab el s ec ur el y affixed o r securely attached:

a F or a de qu at e protection this helmet shall fit or be adjustableclosely to t he r eq ui re d size,

h This helmet is m ade to a bs or b s om e o f th e energy o f a blow bypartial destruction o f its c om po ne nt p ar ts and even thoughdamage may not be readily apparent any hehnet subject tosevere im p act sh ou ld b e replaced, and

c T o maintain full efficiency o f this helmet there shall be noalteration to t he s tr u ct ur e o f t he h el me t or its c o mp o ne n t p ar ts . Methods for sampling of helmets.

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IS : 2925 - 1984 PPEN IX A

l use 0.4METHOD OF TESTING STERILIZATION

A-I. PROCEDUREA-I.I Subject the enti re helmet to r reaternent set out in both a antib given below and after treatment examine it for evidence of deteriorat ion, distortion or separation:

a Expose the helmet to a moist atmosphere of anti septi c gas ,preferably formaldehyde, at a ten, perature of

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IS : 2925 - 1984 PPEN IX C

l use 5.2.2M E T H O D O F C HE CK IN G CLEARANCE ABOVE T H E HEADAND T H E WEARING H E I G H T D E P T H O F FIT c r SAMPLESC-l.1 Th e samples shall be selected as in 9.1.C-2. CLEARANCE ABOVE T H E H EA DC-2.1 In the case of helmet which ha s reinforcing ribs, m ea su re thedepth o f rib and correct t he m e as ur ed c le ar an ce a cc or di ng ly . Mo u n tthe helmet on a headform s IS : 7692-1975* corresponding to th esize of headband marked on th e h el me t, in a position similar to thatwhich it would occupy on a m an s head. Apply a load of 10 kg, to th etop of th e h el me t this can be conveniently applied by using a 10 kgb ag of sand . M easu re the clearan ce by means o f a ro d of diametern ot m ore than 10 m m inserted through the hole dri1Jed in the verticalaxis o f th e headform.C-3. WEARING HEIGHT D EPTH O F F I T0-3.1 Mount th e h el me t o n a h ea df or m c or re sp on di ng to th e size o fheadband marked on the helmet and apply a pressure of 10 kg as inC-2.1. Mark on the he adform the position o f th e lower edge of th eheadband. Remove the helmet and measure th e v er ti ca l d is ta nc ebetween the t op of th e headform and th e mark showing th e positionconcupied by th e headband.

PPEN IX D l use 5.3.1

TES T F O R S T R E N G T H O F CH IN ST RA PD -l . SAMPLESDl.1 T he samples fo r testing shall be selected as given in 9.1. 2 PROCEDURED-2.1 T h e helmet is p la ce d o n th e ap p rop riate h eadfo rm s IS : 76921975* with t he ch in strap fastened as in normal position.

-Specification for wooden headform for testing of helmets.\ \

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IS J 2925 1984D-2.2 A load o f 10 kgf will be applied to the chin strap throughS hook. After 5 minutes th e chin strap shall not break.D-2.3 T h e S hook to be used in this set up shall be approximately100 ro m overall height, 50 rom overall width and will be made from10 or 12 mm steel rod.

PPEN IX E lause8. 1

SH O CK A B SO R PT IO N T ES Ts r SAMPLESE - l . l T h e samples shall be selected as given in 9.1.E-2. APPARATUSE-2.1 W ood en H ead fo rm . - A w ooden headforrn s t IS : 76921975 shall be used.E-2.2 A G a u g e a n d Reco rd i n g A p p a r a t u s fo r M e a s u r i n g F o r c e The gauge and th e associated recording apparatus shall have propertime constant to be able to measure the im pact loading up to 40 kN 4080 k g f ) independent of th e tim e of application of th e force and aslow application of th e load required for it s calibration. The gaugeshall have a minimum stiffness of 500 kN fmm 5 tf from). T h eheadform shall be mounted on th e g au ge so that it s vertical axis throughthe crown coincides with th e vertical axis of th e gauge.E-2.3 A c c u r a c y - The o ve ra ll a cc ur ac y of the recordin g apparatussh all b e 10 pereen rE-2.4 Block - Concrete or similar monolithic block to support thegauge and headform, having the m in im um d im en si on s: height I m,length 1 m , width 0 6 m and mass 1 t. T he block shall be bedded ondry sand on a solid floor.E-2.5 S t r i k e r - A striker in the form of a rectan gu lar b lo ck of woodweighing 3 kg a nd h av in g a horizontal striking face 180 m m X 180 rom.T h e s tr ik er s ha ll s li de freely and without oscillation down tw o verticalguide wires so positioned that the centre of gravity o f t he s tr ik er lies onth e vertical axis of the gauge and both lie in the plane o f th e guidewires.

*Specification for wooden headforrn for testing of helmets.

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IS : 2925 - 1984E-3. METHODE-3.1 T h e h el me t w i th apex cushioning material, if any, removed shallbe mounted on t he h ea df or m, o f appropriate size. Th e striker shall beraised a clear height o f I 5 m 5 m m above the point of contactwith the helmet and allowed to fall freely. A photographic or otherhigh speed record o f the force tran sm itted d u rin g impact shall be made.

PPEN IX F lause8.2 )

M ETH O D OF TESTING PENETRATION RESISTANCEF-l. SAMPLEF-I.l T h e sample for testing shall be selected as given in 9.1 an d shallbe tested in one of th e conditions given in 8. 1 which has given worstresult see 8.2 ).F-2. PROCEDUREF-2.1 Mo u n t helmet on any headforrn see I S : 7692-1975* . D ro pfreely a plumb bob of 50 0 g mass with a conical steel point having ani nc lu de d a ng le of 36 0 and a sphe rical po in t radius of no t more than0 5 m m from a clear height o f 3 0 m with th e pointed e n d d ow n w ar ds onto th e to p o f th e crown of th e helmet. Examine t he h el me t for piercingo r denting, failure of any i nt egral part s, etc.

PPEN IX G lause8.3 )

M ETH OD OF TESTING F LA MMA BILITY R ESIS TA N CEc-i. SAMPLESG-l.1 The samples for testing shall be selected as g iv en in 9.1.G-2. BURNE R W ITH ACCESSORIESG-2.1 The test shall be carried out with barthel burner conformingto A-I o f IS : 4355-1977t.

*Specification for wooden headform Cor testing of helmets.t p ~ c i f i c t i o n for fire-resistant brattice cloth irst r v s on ).

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IS : 2925 - 1984G 2.2 The fol1owing accessories sh al l be used with t he burne r:

a) Reservoirb) Connecting tube of polyethylene or soft rubberc) Absolute alcohol ( ethanol ),d) IJa rc copper wire 71 mm diarnet c r h av in g a free length of notless than 100 rom ande) Stand to help th e reservoir.

G 2.3 The absolute alcohol shall be fil led in the reservoir and the tubeair bubbles entrapped in the tube shall be removed by pressing th e tubeseveral times. Cotton waste soaked in spirit shall be kept in the cup onthe burner a n d lighted. After a few rninutes w he n the burner issufficientlv heated the regulator of burner shall be turned to allow thespirit to flow in th e form of vapour.G ..2.4 Burner shall be operated with the valve so as to get a flarne heightof 150 Hun. Level of th e fuel shall be not Jess than 760 mrn above th ebase of the burner. Satisfactory operation of burner shall be checkedby inserting in the flame th e bare copper wires in position normallyoccupied by lo w edge of the test piece that is, 50 m m above the burnerand reaching farther edge of the flame. The wire should not take I110rCthan 6 seconds to melt.G-3. PROCEDUREG 3.1 W ith the helmet upside down and the burner angled at 45 to th evertical the end of the f lame shall be applied to the outside of the shellat any suitable point between 50 and 100 m m from the crown for aperiod of 10 seconds. The plane t angr nt ia to the test point sh all b ehorizontal.G 3.2 The shell shall be examined for flalning 5 seconds after removalof the flame.

PPEN IX H( l use 8 4METHOD O F TESTING ELECTRICAL RESISTANCE

n-r, SAMPLES8 1 1 The samples for testing shall be selected as g iv en in 9.1.

14

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IS : 2925 - 1984H-2. PROCEDURE8-2.1 Invert the helmet and place it on a frame in a suitable container.With a solution of 6gjl of water, fill the container and the helmet towithin 12. of the junction of the brirn and the dorne, or, if th ehelmet is provided with holes to a depth of 12 rom below th e holes.Allow th e helmet to remain in the solution for a period of 18 to 24hours and main ta in the temperature of 25C to 35C during this period.Then apply an alternating voltage of 2 000 V rev.s at 50 Hz and ofapproximately sine wave form, for one minute between electrodes placedin the solution inside and outside the helmet respectively. If no electricalbreakdown occurs) disconnect the high voltage supp ly and connecta milliammete r in the circuit on each side of th e electrode. Raise th etest voltage slowly observing the ammeter reading, until th e appliedvoltage is 2 000 V. An automatic t ripping dev ice may be used in thecircuit in addition to the milliarnrneter.

A P P E N D I X J lause8.5

METHOD OF TESTING WATER ABSORPTIONj i SAMPLESJ-1.1 The sample which have been used for shock absorption incondition 8.I b) shall be used for carrying out this tes t see 9.1 .J-2. METHODJ-2.1 Weigh the sample full shell). Immerse for 24 hours in water,at a temperature of 25C to 35C. Remove from water, dry the surfacesby wiping them, and weigh the aga in . Report the average gain in massas a percenatge.

A P P E N D I X K l use 8.6

METHOD OF TESTING REAT RESISTANCEK-l. SAMPLESK-I. The samples for testing shall be selected as given in 9.1.K-2. PROCEDUREK-2 .1 Place th e shell for minutes in an oven maintained at atemperature of 93 5C. The shell shall be shielded from directradiation during the test : Remove the shell from the oven and examinefor seperation, distortion or softening.

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SHRI U S. NIGo\MS I n n S. RAJ l ;

IS : 2925 984 Continued from page 2

Member s Representing8RR I R. B. KRUI l \NA Gadgets India Faridabad

SHRI M u. K H U J t ~ AlternateSURI G. R. MRNON In personal capacity S,ctor 12, 12J2 R. K. PuramNew De/hi Central Mining Research Station CSIR , DhanbadThe Automotive Research Association of IndiaPune

SHRI R. RA1\ IAKl t ISHNAN Concord Arai Pr ivat e Limited MadrasSHR I B. RA J GOP r, Alternate

SHRI SHIV KUMAR Steel Authority of India Limited New DelhiSUR I B. SI SOH Ministry of Defence R D

SHRI K R M C I t ~ N D R _ ~ N AlternateSHRI D. SIRK A I: Synthetics and Chemicals Ltd Bare illv

Acted as convener in the meet ing in which this standard is finalised.16

MGIPF--226 Deptt. ofBIS/2007-9-7-2007-100 Rooks

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URE U OFIN I NST ND RDSHeadquarters:Manak Shavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 110002 elephones 23230131, 23233375, 23239402 ax 91+011 23239399,23239382E Mail: info@bis.org.in website: http://www.bis.org.inCentral Laboratory.Plot No.20/9 Site IV, Sahibabad Industrial Area, SAHIBABAD 201010Reg/onsl Offices:Central : Manak Bhavan, 9 Bahadur Shah Zatar Marg, NEW DELHI 110002*Eastern : 1/14 CIT SchemeVII M, Road, Kankurgachi, KOLKATA700054Northern : SCO 335-336, Sector 34-A, CHANDIGARH 160022Southern: C.I.T. Campus, IV Cross Road, CHENNAI 600113tWestern: Manakalaya, E9, MIDC, Behind Marol Telephone Exchange,Andheri (East), MUMBAI 400093

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