ASTM D3874-2010 热丝源法测定材料的点燃性的标准试验方法

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【英文标准名称】:StandardTestMethodforIgnitionofMaterialsbyHotWireSources
【原文标准名称】:热丝源法测定材料的点燃性的标准试验方法
【标准号】:ASTMD3874-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D09.21
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:hotwire;ignition;resistancetoignition;Electricalinsulatingsolids;Electricalresistance/resistivity--insulatingmaterials;Heatingtests--electricalinsulatingmaterials;Hotwiresources/applications;Ignition--electricalinsulatingmaterials;
【摘要】:Duringoperationofelectricalequipment,includingwires,resistors,andotherconductors,itispossibleforoverheatingtooccur,undercertainconditionsofoperation,orwhenmalfunctionsoccur.Whenthishappens,apossibleresultisignitionoftheinsulationmaterial.Thistestmethodassessestherelativeresistanceofelectricalinsulatingmaterialstoignitionbytheeffectofhotwiresources.Thistestmethoddeterminestheaveragetime,inseconds,requiredformaterialspecimenstoigniteunderthespecifiedconditionsoftest.Thismethodissuitabletocharacterizematerials,subjecttotheappropriatelimitationsofanexpectedprecisionofx00B1;15%,tocategorizematerials.Inthisprocedurethespecimensaresubjectedtooneormorespecificsetsoflaboratoryconditions.Ifdifferenttestconditionsaresubstitutedortheend-useconditionsarechanged,itisnotalwayspossiblebyorfromthistesttopredictchangesinthefire-test-responsecharacteristicsmeasured.Therefore,theresultsarevalidonlyforthefiretestexposureconditionsdescribedinthisprocedure.1.1Thistestmethodisintendedtodifferentiate,inapreliminaryfashion,amongmaterialswithrespecttotheirresistancetoignitionbecauseoftheirproximitytoelectrically-heatedwiresandotherheatsources.1.2Thistestmethodappliestomoldedorsheetmaterialsavailableinthicknessesrangingfrom0.25to6.4mm(0.010to0.25in.).1.3Thistestmethodappliestomaterialsthatarerigidatnormalroomtemperatures.Thatis,itappliestomaterialsforwhichthespecimendoesnotdeformduringpreparation,especiallyduringthewire-wrappingstepdescribedin10.1.Examplesofdeformationthatrenderthistestmethodinapplicableinclude:1.3.1Bowing,ineitheratransverseoralongitudinaldirection,ortwistingofthespecimen,duringthewire-wrappingstep,toadegreevisibletotheeye.1.3.2Visibleindentationofthewrappedwireintothespecimen.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsgiveninparenthesesareforinformationonly.(Seeforfurtherdetails.)1.5Thistestmethodmeasuresanddescribestheresponseormaterials,products,orassembliestoheatandflameundercontrolledconditions,butdoesnotbyitselfincorporateallfactorsrequiredforfirehazardorfireriskassessmentofthematerials,products,orassembliesunderactualfireconditions.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.7Firetestingisinherentlyhazardous.Adequatesafeguardsforpersonnelandpropertyshallbeemployedinconductingthesetests.Note18212;AlthoughthistestmethodandIEC60695-2-20,differinapproachandindetail,dataobtainedusingeitheraretechnicallyequivalent.
【中国标准分类号】:C80
【国际标准分类号】:29_035_01
【页数】:4P.;A4
【正文语种】:英语