Tiêu chuẩn iso 04855 1981 scan

I n tern ati on al I N TE R N ATI ON AL ORG AN I ZATI ON Pers on al Pro t ect eu rs Fi rst U DC - de l ’ a?i l - M6th od es OPTAH bl AWi R - d ’ es sai au t res n0 @ 4855 * &@ l &~ CTAH ~ AP TH AWWOR G AN I S ATl ON N on - opt i cal test : acci d en t tests, I N TE RN ATI ON ALE DE N OR M ALI S ATI ON met h od s q u ’ o pt i q u es - 4- 89 Descri ptors corrosi on S TAN D AR D I Z ATI ON ~ M E ~ M H AP O~ H AR eye- prot ectors i n d i vi d u el s ed i ti on FOR St an d ard Ref preven ti on , ch emi cal tests, eyes, g as eyeg l asses, resi st an ce safety d evi ces, tests, i mpact tests, th ermal tests, u l travi ol et N o I SO48 5- radi ati on , fl ammabi l i t y ( E) testi n g , tests Pri ce based on pag es Foreword I S0 ( th e I n tern ati on al Org an i zati on for n ati on al stan d ard s i n sti tu tes ( I S0 n ati on al Stan d ard s i s carri ed ou t th rou g h bod y i n terested i n a su bj ect for wh i ch ri g h t to be represen t ed on th at an d n on - g overn men tal , Draft I n tern ati on al Stan d ard i zati on ) i s a worl d wi d e membe r bod i es) I S0 tech n i cal work of fed erati on of d evel opi n g commi tt ees I n ter- Every me mber a tech n i cal commi t t ee h as been set u p h as th e commi tt ee i n l i son wi th Th e I n tern ati on al org an i zati on s, g overn men t al I SO, al so take part i n th e work Stan d ard s ad opt ed by th e tech n i cal commi t tees are ci rcu l ated to th e member bod i es for approval before th ei r acceptan ce as I n tern ati on al Stan d ard s by th e I S0 Cou n ci l I n tern ati on al St an d ard I S0 Person al safety - 4855 was d evel oped by Tech n i cal Commi t t ee I SO/TC 94, Protecti ve member bod i es i n J u l y cl oth i n g an d eq u i pmen t, an d I t h as been approved by th e me mber bod i es of th e fol l owi n g I rel an d Roman i a I srael Sou t h Bel g i u m I tal y Spai n Czech osl ovaki a Mexi co Swi tzerl an d Fran ce N eth erl an d s U SA German y, F R N ew Zeal an d U SSR H u n g ary N orway I ran Pol an d Den mark U n i ted ii in Org an i zati on Swi tzerl an d th e for Afri ca, Rep of cou n tri es expressed d i sapproval of th e d ocu men t g rou n d s : I n tern ati on al to cou n tri es : Au stral i a Th e membe r bod i es of th e fol l owi n g Pri n ted ci rcu l ated Au stri a on tech n i cal @ was 978 Ki n g d om Stan dardi zati on , l sB1 Con ten ts Pag e Scope an d fi el d of appl i cati on Referen ces Test for robu st n ess of th e eye- protectors Test for stabi l i ty at el evated temperat u re Test for resi stan ce to u l tra- vi ol et rad i ati on Test for i g ni ti on Test for resi stan ce to corrosi on Test for su i tabi l i ty for di si n fecti on .4 Test for resi stan ce to h i g h - speed parti cl es Test for n on - ad h eren ce of mol t en metal 1 Test for resi stan ce to pen etrati on of h ot sol i d s Test for proof ag n st ch emi cal d ropl ets Test for protecti on ag n st d u st Test for protecti on ag n st g as 7 Ill I N TERN ATI ON AL Person al Scope Th i s eye- protectors an d fi el d I nternati on al meth od s for g i ven i n I S0 I S0 STAN D ARD of N on - opti cal appl i cati on Stan dard eye- protectors - speci fi es th e I S0 th e n on- opti cal req u i remen ts for 4849, are I S0 4646 to 4653 ) test 4850, eye- protectors, g en eral l y fol l owed Referen ces I S0 565, Test si eves pl ate - ) preparati on In N omi n al - Wo ve n s i zes : I S0 of be carri ed ou t fi rst by th e test for metal wi re - Speci fi cai i on s - eye- protect ors Fi l ters - for U ti l i sati on wel d i n g an d an d rel ated t ran smi tt an ce re- t s 4654 Of th e tests descri bed , th e test for stabi l i ty at el evated temperatu re sh ou l d met h od s eye- prot ect ors Person al t ech n i q u es meth od s are g i ven i n I S0 PRELI M I N ARY RE M ARK - Person al ( E) test wh i ch q u i remen Th e opti cal test 48551 981 cl oth I S0 on Person al an d eye- prot ect ors t ran smi t fan ce - U l travi ol et fi l ters - req u i remen t s robu stn ess an d - I S0 4652, Person al ti on an d I S0 4854, eye- protect ors tran smi tt an ce - I n frared fi l ters - U ti l i sa- req u i remen ts perforated apert u res 4853, Person al eye- protectors 4651 , U ti l i sati on Dayl i g h t fi l ters - Person al U ti l i zati on and eye- prot ect ors tran smi ttan ce - requ i rements Opti cal test met h od s, I S0 48! %- 981 Test for ( E) robu stn ess of th e eye- protectors For cyl i n dri cal l y cu rved ocu l ars, th e test su pport tu be an d l oad ri ng sh al l be cu rved to form to th e vex an d cave su rTh i s test appl i es to eye- protectors wh ose pri mary fu n cti on protect ag n st h i g h - mass, l ow- vel oci ty fl yi ng i s to faces of th e ocu l ar respecti vel y obj ects U n mou n t ed Proced u re ocu l ars Cen tre th e ocu l ar approxi matel y th e apparatu s so th at from radi u s from Th e apparatu s i s sh own i n fi g u re , _ o3m, su pport for th e su pport tu be Adj u st pl asti cs cyl i nder wi th ocu l ar sh al l be a steel or an i nternal di ameter of 32 mm or be an i nteg ral part of, cu sh i on ed by a seati n g ri ng di ameter of 25 Th e + f4 n ormal an mm l ami n ated + ocu l ars, th e temperatu re i n th e OC For ocu l ars mad e sol el y from test g l ass, room temperatu re shal l appl y a steel base Th e ocu l ar shal l be fi rml y attach ed to th e top of th e Al tern ati ve tests d emon strated th at may be u sed , provi ded th at it can be th ey g i ve equ i val en t resu l ts Th e seati n g materi al I L I RH D Th e combi n ed mas s of ocu l ars Mou n t ed assembl y sh al l be at l east kg , A l oad ri ng of mas s 250 g sh al l be pl aced u pon th e ocu l ar Th i s ri ng shal l h ave an i n si de di ameter th e same as th at port tu be, wi th i n m m an d Th i s seati n g sh al l h ave a th i ckn ess of m m an d th e same th e su pport ocu l ar tu be ri g i d cyl i n der sh al l be i n serted i nsi de an d ou tsi de di ameters as th e tu be sh al l h ave a h ardn ess of 40 th e , area sh al l be 23 an ou tsi de stri kes th e cen i re of th e su pport For pl asti cs or Th e i mmed i ate tu be th e Apparat u s fal l i ng i nto, on a 22 m m di ameter steel bal l of 44 g mass H ead - form of th e su p- an d an y ven i en t ou tsi de di ameter A setti n g h avi n g th e same d i men si on s an d h ard n ess as th e su pport ri ng tu be Th e h ead- form h ard n ess of of sh al l 50 to be mad e of 60 I RH D seati n g ri ng ( g asket) shal l be pl aced between th e l oad ri ng an d th ose th e ocu l ar sh ows an exampl e th e appropri ate a su i tabl e materi al n ati onal Di men si on s h ead- form in of wh i ch mi l l i metres J oi n ts Tu be \ Fi g u re - Apparat u s for test for robu s t n ess of \ \ u n mou n t ed y h avi n g Th e di men si on s sh al l form - ocu l ars Steel base a to fi g u re I S0 - cool th e eye- protector to at th at temperatu re for treatmen t protector to - shal l 20 -I be f OC, an d mai n tai n i t h before testi n g For eye- protectors i n ten ded for di ti onal - 4855- 981 ( E) a secon d ti me u se i n l ower temperatu res, ad- carri ed OC, an d ou t by cool i n g mai n tai n i n g it th e th ere eye- for h before testi n g Th e tests shal l be d u cted wi th i n 30 s after compl eti n g th e temperatu re treatmen t Test a= 66to68mm b= 2mm c= I OOto for t est for - Oven , at of temperatu re capabl e of mai n tai n i n g a temperatu re of 55 + ‘ Y of Proced u re h ead - form mou n t ed Pl ace th e ocu l ars ( and th e tests speci fi ed i n cl au ses 2, an d eye- protector, i n th e posi ti on correspon di n g to mal u se, i n th e oven for 30 mi n at a temperatu re of 55 41 Th en remove i t an d al l ow to mu m test 2 el evated 1 5mm Exampl e robu st n ess stabi l i ty Apparat u s Fi g u re for Apparat u s of in I S0 30 mi n stabi l i ze at 23 Th en su bmi t accord an ce wi th meth od nor- OC C OCfor a mi n i - th e eye- protector to th e & g i ven in th e opti cal cl au se of 4854 A d evi ce al l owi n g a 22 m m d i ameter steel bal l of n omi n al mas s 44 g to drop, from rest, from a hei g ht of , _ 00 , , am, on to th e speci fi ed area of th e eye- protector Test for Expose th e 3 di stan ce Th e eye- protector to be tested sh al l be pl aced on th e h ead- form correspon di n g to n ormal of th e be tested for 00 h radi ati on to radi ati on from appropri ate of 300 mm I n ci den t radi ati on sh al l a at a be su bstan ti al l y u se A sh eet of carbon paper on top of a sh eet of wh i te paper, each bei n g to u l travi ol et n ormal to th e su rface of th e ocu l ar - N OTE sh eet ocu l ar to fu sed- si l i ca en vel ope h i g h - pressu re xen on l amp of 450 W Proced u re i n th e posi ti on resi stan ce d i men si on s, sh al l between th e eye- protector an d th e h ead- form I t i s possi bl e,i f n ecessary, to redu ceth e ti me exposu rean d th e di stan ceto th e ocu l ar; for exampl e, h at 200 mm 50 be i n serted Th e h ead- form an d eye- protector assembl y sh al l be posi ti on ed u n dern eath th e test apparatu s Th e poi n ts of - wi th i n i mpact sh al l be : m m of th e g eometri c cen tre of both ri g ht an d Test for i g n i ti on I n du stri al protectors l eft mou n ted ocu l ars, - on th e n ose bri dg e, - on th e t wo an d Th i s h i n g es Pu rpos e test is of test i n ten ded i g n i te or ti n u e to to establ i sh wh eth er th e test sampl es g l ow, Th i s test i s si dered as th e referen ce test For rou ti n e produ cti on port mon i tori n g , may be u sed , provi ded th at th ey g i ve equ i val en t resu l ts Temperat u re req u i remen ts for the n at u re of t est sampl es di ti on s : mm - h eat th e eye- protector to 55 th at temperatu re for + Apparat u s test Th e above test sh al l be carri ed ou t i n th e fol l owi n g an d Fi ve compl ete eye- protectors shal l be tested 3 N u mber an al ternati ve test an d su p- G as wel d i n g i n di ameter, wi th rod , fl at mad e of steel ; 300 m m l on g an d en d faces OCan d mai n tai n i t at h before testi n g ; H eat sou rce I So ~ &OS- ~ 81M 3 Th ermocou pl e an d temperatu re- i n d i cat i n g Test for resi stan ce to h i g h - speed parti cl es d evi ce I n th e l i g ht u si n g steel of d escri bed in i t i s bel i eved th at th i s cl au se th e provi de tests th e most Proced u re sati sfactory Sh ou l d H eat th e g as wel di n g temperatu re of rod over a l en g th of at l east 50 m m to 650 f OC Measu re th e temperatu re by mean s of th e th ermocou pl e attach ed trol speci fi c of i mpact h azard s be resi stan ce i den ti fi ed of at eye- protectors some fu tu re ti me a of th e ag n st wh i ch be rod presen t kn owl ed g e, bal l s eye- protectors to presen t stan d ard s are fou n d u n su i tabl e, th e establ i sh men t of oth er test to requ i remen ts at a d i stan ce of may be n ecessary 20 m m from th e h eated en d of th e rod th e rod ( posi ti on ed verti cal l y) Press th e h eated face of ag n st th e su rface of sampl e (the tact force bei n g equ al to th e wei g h t for a peri od of s, an d th en th e test of th e rod) remove i t Carry ou t th e test on al l parts bf th e eye- protector Carry ou t a vi su al i n specti on du ri n g th e test i n order to establ i sh wh eth er Apparat u s th e test sampl es i g ni te or ti n u e to l - l ead- form g l ow, Th e h ead- form sh al l be mad e of si on s shal l form 6, Eye- protect ors u s ed by workers sol el y for of Pu rpos e Th i s test Th e di men - nati on al of wh i ch h ead- fi g u re sh ows an exampl e d ayl i g h t of t est i s i n ten ded to assess eye- protectors for i g ni ti on pro- perti es 2 cast al u mi n i u m th ose of th e appropri ate th e form at ten u ati on to Propu l si on eq u i pmen t Th e apparatu s sh al l be capabl e of i mparti ng to a m m steel bal l kn own vel oci ti es u p to 90 m/s Proced u re N OTE S Pl ace th e compl ete eye- protector, preh eated oven set to 200 sampl e i s removed , & or i ts OC, for n ote wh eth er compon en ts, f mi n i nto a Wh en th e i t h as bu rn ed du ri n g th e test apparatu scon si stsfu n d tal l yof a barrel or tu be of su ffi - Th e ci en t l eng th breech or to en su re l oadi ng posi ti on in pressed g as a stan t mech an i sm rel ati on to the exi t vel oci ty ensu ri n g tu be or of that barrel end, the the and steel bal l of bal l , is in a spri ng wi th a a g i ven or com- peri od mean s Th e vol u me of th e sampl e sh du l d n ot exceed % of th e oven vol u me the vel oci ti es Th e be pu rg ed wi th resi stan ce to by fi rst removi n g al l adh eri n g matter, aq u eou s mi n ( m/m) sol u ti on of On removal from th i s sol u ti on , i mmed i atel y chl ori de at dry for in a room th i s sol u ti on to % % ( m/m) temperatu re an d wi th ou t 24 h at water an d l eave to room measu remen t d i stan ces of i n vol ved, apparatu s the exi t a ti mi n g al so i n cl u des vel oci ti es; i ndi cator, becau se recordi n g a of in i s requ i red of Th e area tu be i mpact vel oci ti es of the and barrel su rrou n di n g sh ou l d be in sh ou l d an y or tube the test case be not mad e as near sh ou l d fu rther be than as possi bl e protected speci men , the 250 mm ag n st h ead- form from to i t ri coch ets and the barrel en cl osed sod i u m for wi pi n g sol u ti on mi n off chl ori de After Th en of tu be l eng th vel oci ty wh en it passes u nder test is of determi n ed the throu gh steel the by bal l in ti mi n g i ts abi l i ty the fi nal to produ ce stag es of i ts an al most travel , i e an d i s i n fl i g ht to th e i tem devi ce sod i u m the r Ach i evemen t pressu re tube and the m ay h ave fi t or of the di fferent requ i remen ts of force of bal l th i s the requ i remen t spri ng i n si de the ch aracteri sti cs as to the l eng th of bu t tu be and the depen ds al so u pon not the Accord i n g l y, it and fi t of u pon of the each apparatu s i s i mpossi bl e barrel on l y l eng th to the g i ve preci se th e bore bal l i n removal from th e adh eri ng temperatu re for i mmerse th e metal parts aq u eou s Th e stan t par- ti cu l arl y oi l an d g rease, th en i mmersi n g th e metal parts i n a boi l i ng Th e corrosi on Determi n e th e resi stan ce to corrosi on of frames, si de- sh i el ds or compon en ts of end metal and ps, measu remen t poi nt Th e or for of or propu l si on r between tests the Test provi de cal i brati ng mu l ti pl es Th e oven sh ou l d of to l i qu i d, ri nse i n l eave l u kewarm Th e ti mi n g speci fi ed; dry before i n specti n g - the an d evi ce sh al l fol l owi n g el ectron i c h ave a degree of two meth od s are ti mer operated by accu racy not recommen d ed ph otoel ectri c l ess than that : cel l s throu gh ampl i fi ers; - a cathode on Test for su i tabi l i ty for accu racy sen si n g each sol u ti on , for ethyl ) is eye- protector exampl e a 0, l g l yci n e h ydroch l ori de requ i red wash i n g to remove by % ray osci l l oscope actu ated by detector coi l s l ocated tu be d i si n fecti on Th e Di si n fect the i mmersi on sol u ti on i n tap water, su bstan ti al of in a di si n fectan t dodecyl - di ( ami n o- for mi n d eposi ts, no i s n ecessary, nor i s an y ri nsi n g n eed ed U n l ess i t prel i mi nary bal l si n g vel oci ty sh ou l d keepi ng the ou g ht vel oci ty be fi xed the ti mi n g and Presen t el emen ts hi g h est of el emen ts the d evi ce requ i red i n di cati ons not to so as to exceed al l ow wi th i n the accu racy are that contempl ated, vel oci ty depen ds 50 the for the mm; the for wi th of sti pu l ated spaci n g between measu remen ts spaci n g accu racy vari ati on s l i mi t s u pon of between th i s spaci n g the other ti mi n g factors of the and the sen - th e d evi ce wh i l e sti l l Di men s i on s in mi l l i met res 36, C Fi g u re - Exampl e of h ead - f orm for P r o ce d u r e test for resi stan ce to h i g h - s peed l o ad ed pi ston fi tted wi th parti cl es an ej ector h e ad d i sh ed i n t h e cen t re t o t ake t h e mol t en metal A fi xed pl atform i s m o u n t e d abo ve t h e Pl ace t h e eye- prot ect or t o posi ti on th e correspon d i n g to h e ad ban d ad j u s t ed be t est ed o n t h e h ead - f orm i n t h e n ormal u s e an d wi th accord i n g to th e t h e t en si on of man u f act u rer’ s ej ector h e ad an d h as a cen tral o pen i n g l arg e e n o u g h t o permi t t h e ch arg e of mol t en metal t o g o t h ro u g h i t i n- stru cti on s Th e en erg y of t h e ej ecti on spri n g an d t h e posi ti on of t h e fi xed I n sert a s h eet of carbo n paper o n t o p of a s h eet of wh i t e paper, each s h eet bei n g of t h e appropri at e d i men si on s, eye- protect or an d prot ect or/h ead - form men t , t h e poi n t the h ead - form Th e n posi ti on th e eye- pl atform sh al l be s u ch th at, on ej ecti on , th e met al ch arg e i s proj ect ed u pward s t o a n omi n al d i st an ce of m m abo ve t h e l evel of t h e ocu l ar assembl y i n fron t of t h e propu l si on eq u i p- of i mpact bei n g n o t mo re t h an an d i n l i n e wi th , bet we e n t h e 0 m m from, t h e mu zzl e of t h e t u be Proj ect t h e steel bal l at t h e sel ected s pe e d o n t o t h e cen t re of each ocu l ar i n t h e case of a two- ocu l ar eye- prot ector, or, i n t h e case of 33 mm a on e- ocu l ar from th e eye- prot ect or, verti cal mi d l i n e of on to th e t wo tests poi n ts- eye- prot ector o n P r o ce d u r e th e h ori zon tal l i n e pass i n g t h rou g h t h e cen t re be t we e n t h e t op an d Pl ace t h e eye- protect or abo ve t h e o pen i n g i n s u ch a way t h at bo t t o m i ts ocu l ar i s i mmed i atel y abo ve t h e cen t re of t h e ej ector h e ad of th e ocu l ar Th e d i recti on of the i mpact sh al l be su bstan ti al l y n ormal t o t h e su rface of t h e eye- prot ect or Lo ad t h e Test for n o n - ad h e r e n ce of m o l t en met al tai n i n g 1 Appar at u s ej ector test apparat u s, Rel eas e t h e s h o wn in fi g u re 4, si sts of a spri n g - sh al l h ave be e n pre- h eat ed t o a si l i ca cru ci bl e - 0 g of g rey i ron at a t emperat u re of ward s u n ti l Th e h e ad , wh i ch red u ce cool i n g of t h e mol t en metal , wi th ped al : th e spri n g d ri ves t h e 45 f OC h e ad verti cal l y u p- i t stri kes t h e st op pl atform an d t h e mol t en met al i s proj ect ed ag n st t h e ocu l ar D i men si o n s in mi l l i metres 500 c t Su i t abl e Eye- protector in jig to eye- prot ector posi ti on h ol d in posi t i on I - Di st an ce Mi n i m u m Th i s test d i stan ce d i men si on i n creased , d i stan ce of pi ece by ad d i ti on pi eces, to - Ej ect i on h ead cyl i n d er - Ej ect i on spri n g Rel e as e ped al 580 -I Fi g u re - Ap par at u s fo r test i n g fo r n o n - ad h e r e n c e of mo l t en met al of a maxi mu r 75 Ej ect i on 75 can be I S0 1 Test for resi stan ce to pen etrati on of h ot Test for proof ag n st 4855- 981 ch emi cal ( E) dropl ets sol i d s 1 1 Apparat u s Apparatu s Th e test apparatu s, sh own in fi g u re 5, si sts of a metal cyl i n der sh aped to h ol d th e test materi al an d to take a fu n nel of heat- i nsu l ati n g materi al sh aped to cen tre a steel bal l on th e test as H ead - form, descri bed ocu l ar area sh al l be covered wi th ben t l i nt th e mas s per u ni t in (fi gu re 2) Th e a dou bl e th i ckn ess of absor- area of wh i ch is approxi matel y 85 g l m2 speci men 1 Procedu re Pl ace th e test (not speci men in th e cyl i n der Preh eat a H an d capabl e of atomi zer, produ ci n g fi ne dropl ets mi st) 6, m m Test paper : wh i te bl otti ng paper 80 m m x 00 m m di ameter steel bal l to abou t 030 OCi n a fu rn ace, wi th d raw th e approxi matel y, bal l from th e fu rn ace, fu nn el , of abou t compl ete a 0, l mol /l sol u ti on of sod i u m bon ate Th i s paper shal l be pl aced over th e l i nt car- Det ect i n g th e test speci men at a 900 OC Observe th e u n dersi de of th e cyl i n der an d, di cati n g in an d drop i t as qu i ckl y as possi bl e i n to th e wh ere i t comes i nto tact wi th temperatu re di pped pen etrati on, i f th e bal l drops, record th e ti me i t i n- h as taken to ph en ol ph th al ei n water, pen etrate sol u ti on , in 500 ml of prepared meth an ol in Test - Apparat u s for testi n g addi n g l i tre mi l l i metres I nsu l ati ng d i ssol vi n g sti rri ng stan tl y (fi l ter i f a preci pi tate forms) , Di men si on s Fi g u re by an d resi st an ce to pen et rati on of h ot sol i d s materi al g of 500 ml of to obtai n I S0 485s- 981 2 i t) Proced u re verted h opper i s n ected an r- bl ower capabl e of del i veri ng approxi matel y Mou n t th e eye- protector on th e h ead- form, to th e ten si on n ormal l y an d pl ace i n a verti cal pl ane coveri n g th e test paper; adj u st th e h ead ban d recommen d ed by th e th e assembl y wi th man u factu rer, th e detector sol u ti on Carry ou t th e sprayi n g at an approxi mate rate of 20 to 30 ml /mi n , abou t 600 m m from th e h ead - form be abou t I O s; du ri ng th i s ti me, an d spray 2, ms/mi n at a pressu re of 255, Pa A su i tabl e ag i tator, capabl e of i n du ci n g from sh ou l d be arran g ed i mmed i atel y above th e r th e bl ower, swi rl i n g i n th e r stream i nl et Th e du st- ch amber ou tl et i s n ected to th e r bl ower i nl et h ol di ng th e atomi zer Th e peri od of sprayi n g shal l spray th e h ead- form from al l Test d u st : 000 g of i n si de th e du st- ch amber; di recti ons pu l veri zed coal shal l be pl aced th e coal d u st shal l h ave th e fol l owi n g g rai n si ze : For safety reason s, i t i s recommen d ed th at ou t th e test be carri ed N omi n al u n der a h ood, mesh Percen tag e pass d i men si on of si eve ( I S0 Assessmen t I f th e detecti n g son col orati on cou n t n eed of sol u ti on wi l l be resu l ts pen etrates th e eye- protectors, i n stan tl y d evel op on th e test paper taken of cri mson col o; ati on proxi mi ty of th e ed g es, provi ded th at th an in th e 565) ( mass/mass) 250 pm 95 25 pm 85 90 M m a cri m- 40 N o ac- i mmed i ate i t d oes n ot devel op more as H ead - form, shal l be covered wi th m m i n si de th e eye- protector, descri bed in a dou bl e th i ckn ess of approxi mate mas s per u ni t area of wh i ch ( see fi g u re 2) absorben t i s 85 g /m2 Th i s l i nt shal l be covered by a sh eet of moi st wh i te paper on wh i ch been marked i n penci l two Test for protecti on ag n st hori zontal d u st ti ng di stan ce between cen tres bei ng 66 m m ( represen- th e ocu l ar areas) i n fi g u re Ph ot oel ectri c for refl ectometer, of qu an ti ti es pertai ni n g to refl ecti on Du st - ch amber, 660 m m x 560 m m g l ass- fron ted, x 560 mm, wi th wi th i ntern al a recei ver (for h opper- sh aped exampl e, peri mental mou n ti n g III ph otovol tai c i s sh own Apparat u s for t est for protecti on cel l , col l ector - Bl ower - = 646 n m, ag n st du st ph otodi ode) i n fi g u re - Bars /* Du st measu remen t a l en s at th e focu s of wh i ch th e mercu ry l amp i s pl aced, an d a radi ati on d i men - bottom an d a ti g h tl y seal ed, h i n g ed l i d To th e bottom of th e i n- Fi g u re th e Th e apparatu s si sts of an i n terference fi l ter for th e wavel en g th si on s h ave ci rcl es abou t 57 m m i n di ameter, th e Apparatu s Th e test apparatu s i s sh own It l i nt th e Th e ex- I S0 4855- 981 Di men si on s Radi ati on I nterference Fi g u re fi tter, X = mi l l i met res recei ver 546 n m Ph otoel ect ri c - in ( E) Procedu re refl ectometer from th e g en erator or cyl i n der is n ected to th e g as ch amber Before pl aci ng th e eye- protector on th e th e two refl ectan ce of ci rcu l ar mou n ti n g th e areas For thi s as sh own h ead- form, u n exposed moi st pu rpose, test determi n e paper wi th i n pl ace th e i n fi g u re at a di stan ce of th e experi men tal 250 m m from Test paper compou n d s, : wh i t e 80 m m ni trate sol u ti on x bl otti n g 00 mm, paper, free from di pped in % su l ph u r mercu ry( l at th e ti me of test th e test paper Pl ace th e assembl ed eye- protector an d h ead- form i n th e du st- Mercu ry( l ) ch amber g fi n el y swi tch an d off settl ed fasten an d th e l i d keep th e ch amber Carefu l l y remove remeasu re th e Operate th e th e refl ectan ce of cl osed exposed th e two bl ower u nti l moi st th e test ci rcu l ar for mi n , d u st h as paper an d areas of water to wh i ch sol u ti on , n i trate g rou n d ml mercu ry( l ) of prepared ni trate cen trated in ni tri c by 00 ml di ssol vi n g of di sti l l ed aci d ( Q I , 42 g /ml ) h as been added Fi nal l y, cal cu l ate th e rati o of th e mean refl ectan ce after exposu re to th e mean refl ectan ce before exposu re Procedu re Mou n t th e eye- protector on the h ead- form symmetri cal l y over th e test paper, wh i ch Test far protecti on ag n st g as u ni t area abou t i tsel f rests on absorben t l i nt of mass per 85 g /m2 arran g ed i n a dou bl e th i ckn ess so as to cover th e ocu l ar area Pl ace th e assembl y i n th e g as- ch amber wi th Apparatu s a trol stri p of test paper pl aced on th e ch amber Th en open th e g as g en erator sl i g htl y, sl i g h tl y as descri bed i n 1 H ead - form, Gas- ch amber ( see fi g u re 2) open , an d room temperatu re fi l l th e g as- ch amber wi th fl oor of th e th e ven t bei ng ammon i a g as at Cl ose th e ven t an d l eave th e test speci men i n th e g as for mi n After th e ch amber h as been cl eared of th e wi th : a g as- ti g ht, i n ternal d i men si on s 560 m m ti g htl y x g l ass- fron ted 560 m m x en cl osu re, g as, remove th e eye- protector an d exami n e th e test paper 560 m m an d a seal i ng , h i n g ed l i d Th e g as ch amber sh al l be ven ti l ated by mean s of a smal l bl ower wi th a capaci ty of abou t I,4 cm3/s Assessmen t of resu l ts an d a ven t pi pe l eadi n g to a fu me ch amber or to th e ou tsi de atmosph ere I f an y trace of g as h as pen etrated th e eye- protector, th e treated test paper wi l l Gas su ppl y : an y ven i en t g as, for exampl e by bl owi n g tai ni n g a cen trated mean s of r th rou g h sol u ti on of g en erati n g tu rn brown ammon i a a wash i n g bottl e - ammon i a ( Q 0, 8%g /ml ap- proxi matel y) or by u si n g a g as cyl i n der of ammon i a Th e ou tl et N o accou n t n eed be taken of an y darken i n g i n th e i mmed i ate vi ci n i ty of th e edg es, provi ded th at i t d oes n ot d evel op fu rther i n th an a d i stan ce of m m i nsi de th e eye- protector