EN ISO 6942-2002 en Protective clothing - Protection against heat and fire - Method of test Evaluation of materials and material assemblies when exposed to a source of radiant heat.pdf

1、BRITISH STANDARD BS EN ISO 6942:2002 Protective clothing Protection against heat and fire Method of test: Evaluation of materials and material assemblies when exposed to a source of radiant heat The European Standard EN ISO 6942:2002 has the status of a British Standard ICS 13.340.10 NO COPYING WITH

2、OUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN ISO 6942:2002 This British Standard, having been prepared under the direction of the Health and Environment Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 26 June 2

3、002 BSI 26 June 2002 ISBN 0 580 39894 3 National foreword This British Standard is the official English language version of EN ISO 6942:2002. It is identical with ISO 6942:2002. It supersedes BS EN 366:1993 which is withdrawn. The UK participation in its preparation was entrusted by Technical Commit

4、tee PH/3, Protective clothing, to Subcommittee PH/3/2, Clothing for protection against heat and flame, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement interna

5、tional or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purpor

6、t to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee

7、any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, pages 2 to 15

8、, and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO6942 June2002 ICS13.340.10 SupersedesEN366:1993 Englishversion Protectivecl

9、othingProtectionagainstheatandfireMethodof test:Evaluationofmaterialsandmaterialassemblieswhen exposedtoasourceofradiantheat(ISO6942:2002) VtementsdeprotectionProtectioncontrelachaleuretle feuMthodedessai:Evaluationdesmatriauxet assemblagesdesmatriauxexpossunesourcede chaleurradiante(ISO6942:2002) S

10、chutzkleidungSchutzgegenHitzeundFeuer Prfverfahren:BeurteilungvonMaterialienund Materialkombinationen,dieeinerHitzeStrahlungsquelle ausgesetztsind(ISO6942:2002) ThisEuropeanStandardwasapprovedbyCENon12November2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatethecondi

11、tionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Ave

12、rsioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,L

13、uxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforC

14、ENnationalMembers. Ref.No.ENISO6942:2002EENISO6942:2002(E) 2 Contents 1 Scope 4 2 Normativereference . .4 Termsanddefinitions .5 4 Principle5 4.1 MethodA .5 4.2 MethodB .5 5 Apparatus .6 5.1 General6 5.2 Sourceofradiation . .6 5.3 Specimenholder . .7 5.4 Calorimeter .7 5.5 Temperaturerecorder 9 5.6

15、Apparatuslocation 9 6 Sampling.10 7 Testconditions . .10 7.1 Conditioningatmosphere . 10 7.2 Testingatmosphere .10 7.3 Heatfluxdensity . .10 8 Testmethod. .10 8.1 Preliminarymeasures 10 8.2 Calibrationoftheradiantsource. .11 8.3 TestA 11 8.4 EvaluationA .12 8.5 TestB 12 8.6 EvaluationB .12 9 Testrep

16、ort . .13 AnnexA(informative)PrecisionofmethodB . Error!Bookmarknotdefined. AnnexZA (informative) ClausesofthisEuropeanStandardaddressingessentialrequirementsorother provisionsofEUDirectives. . 15ENISO6942:2002(E) 3 Foreword Thisdocument(ISO6942:2002)hasbeenpreparedbyTechnicalCommitteeISO/TC94“Perso

17、nalsafety Protectiveclothingandequipment”incollaborationwithTechnicalCommitteeCEN/TC162“Protectiveclothing includinghandandarmprotectionandlifejackets”,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,

18、atthelatestbyDecember2002,andconflictingnationalstandardsshallbewithdrawnatthelatest byDecember2002. ThisdocumentsupersedesEN366:1993. ThisdocumenthasbeenpreparedunderamandategiventoCENbytheEuropeanCommissionandtheEuropean FreeTradeAssociation,andsupportsessentialrequirementsofEUDirective(s). Forrel

19、ationshipwithEUDirective(s),seeinformativeannexZA,whichisanintegralpartofthisdocument. AnnexAisinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, Fra

20、nce,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.ENISO6942:2002(E) 4 Introduction Protectiveclothingagainstradiantheatiswornatdifferentoccasionsandaccordinglytheradiationintensity (characterisedbytheheatfluxdensity)act

21、ingontheclothingmaterialextendsoverawiderange.ThisEuropean Standarddescribestwotestmethodswhichcanbeappliedtoallsortsofmaterials,but,accordingtotheintended useofthematerial,theheatfluxdensityhastobechosenproperlyandtheresultshavetobeinterpretedcorrectly, Industrialworkersorfirefightersmaybeexposedto

22、arelativelylowradiationintensityoveralongperiodoftime. Ontheotherhand,industrialworkersorfirefightersmaybeexposedtomediumradiationintensitiesforrelatively shortperiodsoftimeortohighradiationintensitiesforveryshortperiodsoftime.Inthelattercase,theclothing materialmaybechangedorevendestroyed. Themater

23、ialsfortheprotectiveclothingshouldbetestedatmediumandhighheatfluxdensities.Thereactionon methodAandthetimest 12 andt 24 andtransmissionfactormeasuredwithmethodBcharacterisethematerial. InformationoftheprecisionofmethodBseeannexA. 1Scope ThisEuropeanStandardspecifiestwocomplementarymethods(methodAand

24、methodB)fordeterminingthe behaviourofmaterialsforheatprotectiveclothingsubjectedtoheatradiation. Thesetestsarecarriedoutonrepresentativesingleormultilayertextilesorothermaterialsintendedforclothingfor protectionagainstheat.Theyarealsoapplicabletoassemblies,whichcorrespondtotheoverallbuildupofaheat p

25、rotectiveclothingassemblywithorwithoutunderclothing, MethodAservesforvisualassessmentofanychangesinthematerialaftertheactionofheatradiation.With methodBtheprotectiveeffectofthematerialsisdetermined.Thematerialsmaybetestedeitherbybothmethods oronlybyoneofthem. Thetestsaccordingtothesetwomethodsservet

26、oclassifymaterials;however,tobeabletomakeastatementor predictionastothesuitabilityofamaterialforprotectiveclothingadditionalcriteriamustbetakenintoaccount. Sincethetestsarecarriedoutatroomtemperaturetheresultsdonotnecessarilycorrespondtothebehaviourof thematerialsathigherambienttemperaturesandtheref

27、oreareonlytoalimitedextentsuitableforpredictingthe performanceoftheprotectiveclothingmadefromthematerialsundertest. 2 Normativereference ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedatappropriateplacesinthetextandthepublic

28、ationsarelistedbelow.Inthecaseof datedreferences,subsequentamendmentsto,orrevisionsof,anyofthesepublications,applytothisEuropean Standardonlywhenincorporatedintoitbyamendmentorrevision.Inthecaseofundatedreferencesthelatest editionofthepublicationsreferredtoapplies(includingamendments). EN20139 Texti

29、lesstandardatmospheresforconditioningandtesting(ISO139:1973) IEC605841 Thermocouples.Part1:ReferencetableENISO6942:2002(E) 5 3 Termsanddefinitions Forthepurposesofthisstandard,thefollowingtermsanddefinitionsapply, 3.1 heattransferlevels Timet 12 Thetimeinseconds expressedtoonedecimalplace,toachievea

30、calorimetertemperature riseof(12 0,1)C Timet 24 Thetimeinsecondsexpressedtoonedecimalplace,toachieveacalorimetertemperature riseof(24 0,2)C 3.2 heattransmissionfactor(TF) Ameasureofthefractionofheattransmittedthroughaspecimenexposedtoasourceofradiantheat.Itis numericallyequaltotheratioofthetransmitt

31、edtotheincidentheatfluxdensity. 3.3 testspecimen Allthelayersoffabricorothermaterialarrangedintheorderandorientationasusedinpracticeandincluding undergarmentsifappropriate. 3.4 incidentheatfluxdensity: Theamountofenergyincidentperunittimeontheexposedfaceofthecalorimeter,expressedinkW/m 2 . 3.5 radia

32、ntheattransferindex(RHTI) Anumber,toonedecimalplacecalculatedfromthemeantime(measuredinseconds,toonedecimalplace)to achieveatemperatureriseof(240,2)Cinthecalorimeterwhentestingbythismethodwithaspecifiedincident heatfluxdensity. 3.6 changeinappearanceofthespecimen Allchangesinappearanceofthematerial(

33、shrinkage,formationofchar,discoloration,scorching,glowingmelting etc.). 3.7 multilayerclothingassembly seriesoflayersingarmentsarrangedintheorderasworn NOTE Itmaycontainmultilayermaterials,materialcombinationsorseparatelayersofclothingmaterialinsinglelayers. 4Principle 4.1 MethodA Aspecimenissupport

34、edinafreestandingframe(specimenholder)andisexposedtoaspecificlevelofradiant heatforaspecifictime.Thelevelofradiantheatissetbyadjustmentofthedistancebetweenthespecimenand thethermalradiationsource.Followingtheexposure,thespecimenanditsindividuallayers,areexaminedfor visiblechanges. 4.2 MethodB Aspeci

35、menissupportedinafreestandingframe(specimenholder)andisexposedtoaspecificlevelofradiant heat.Thetimesfortemperaturerisesof12Cand24Cinthecalorimeterarerecordedandareexpressedas radiantheattransferindexes.Thepercentageheattransmissionfactoriscalculatedfromthetemperaturerisedata andisalsoreported.ENISO

36、6942:2002(E) 6 5Apparatus 5.1General Thetestapparatusconsistsofthefollowingitems,whichareusedforbothtestmethods: sourceofradiation(5.2); testframe(5.3); specimenholder(5.3). FormethodB,thefollowingarealsorequired: calorimeter(5.4); temperaturemeasuringandrecordingdevice(5.5). 5.2 Sourceofradiation T

37、heradiationsourceconsistsofsixsiliconcarbide(SiC)heatingrods,withthefollowingcharacteristics: totallength:(3562)mm; lengthofheatingpart:(1782)mm; diameter:(7,90,1)mm; electricalresistance:3,6 W 10%at1070C. TheserodsareplacedinaUshapedsupportmadeofinsulating,flameresistantmaterialsothattheyarearrange

38、d horizontallyandinthesameverticalplane.Figure1showstheconstructionaldetailsofthesupportandthe arrangementoftheheatingrods,which,arelooselymountedinthegroovesofthesupporttoavoidmechanical stress. Dimensionsinmillimetres (toleranceformeasurements0,1mm) 1Siliconcarbiderod Figure1:SourceofradiationENIS

39、O6942:2002(E) 7 Adiagramofapossiblepowersupplyfortheradiationsourceisshowninfigure2.Thesixrodsarearrangedinto twogroupsofthree,placedinseries.Thetwogroupsareconnectedinparallelandarewiredtothe220Vsupply throughapreresistanceof1 voltagefluctuatesbymorethan1%duringameasurement,stabilisationhastobeprov

40、ided. 1Siliconcarbiderod 2Preresistance Figure2:Circuitdiagramforheatingrods Theelectricalconnectionsoftheheatingrodsshallbemadecarefully(e.g.bymeansofastrandedaluminium band),takingintoconsiderationthattherodsbecomeveryhot.Precautionsshallbetakentoavoidshortcircuits betweentherods. Thecorrectoperat

41、ionoftheradiationsourcecanbecheckedbyusinganinfraredthermometertomeasurethe temperatureofthesiliconcarbiderods.Afterallowingtheradiationsourcetowarmupforaboutfiveminutes,the rodsshouldhavereachedatemperatureofabout1100C. 5.3 Specimenholder DifferentspecimenholdersareusedfortestsAandB.Theyareconstruc

42、tedfrom2mmthicksteelsheetsfixedtoa 10mmthickaluminiumplate.ThespecimenholderfortestAhaswidersideplatesthanthespecimenholderfor testB.ThespecimenholderfortestBalsoholdsthecalorimeterinposition. Thespecimenholdersarefastenedsothattheyfitconcentricallyintotheopeningoftheverticalofthetestframe. Whenfixe

43、dinposition,thespecimenholderfortestsAholdthebackofthespecimen10mmbehindthesheet metalcoveratthefrontofthetestframe.ThespecimenholderfortestBholdstheverticalcentrelineofthe calorimeter10mmbehindthesheetmetalcoveratthefrontofthetestframe. 5.4Calorimeter Thecurvedcopperplatecalorimeterisconstructedasfollows. Arectangle(50mmby50,3mm)iscutfromacoppersheetofatleast99%purityand1,6mmthick.Thiscopper plateisbentinthelongerdirectionintoanarcwitharadiusof130mm.Thecho