【英文标准名称】:StandardPracticeforConductingTestsonSealantsUsingArtificialWeatheringApparatus
【原文标准名称】:用人工风化仪对密封件进行试验的标准实施规范
【标准号】:ASTMC1442-2011
【标准状态】:现行
【国别】:
【发布日期】:2011
【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】:C24.40
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:加速老化;光化辐射;耐人工老化加速性;耐久性;曝光
【英文主题词】:acceleratedweathering;actinicradiation;artificialacceleratedweathering;durability;exposure
【摘要】:Thispracticedeterminestheeffectsofactinicradiation,elevatedtemperature,andmoistureonsealantsandtheirconstituentsundercontrolledlaboratoryartificialweathertestconditions.Whenconductingexposuresindeviceswhichuselaboratorylightsources,itisimportanttoconsider(1)howwelltheartificialtestconditionswillreproducepropertychangesandfailuremodescausedbyend-useenvironmentsonthesealantbeingtestedand(2)thestabilityrankingofsealants.RefertoPracticeG151forfullcautionaryguidanceregardinglaboratoryweathering.Becauseofdifferencesinthespectralpowerdistributionsoftheexposuresources(xenonarc,fluorescentUVlamps,andopenflamecarbonarc),aswellasotherconditionsusedinthethreetypesoflaboratoryweatheringtests,includingtemperature,typeandamountofmoisture,andtestcycles,thesethreeproceduresmaynotresultinthesameperformancerankingortypesoffailuremodesofsealants.Further,differentexposuredurationsmayberequiredfortestingtheweatheringperformanceofsealantsbythethreetypesofexposures.Comparisonsshouldnotbemadeoftherelativestabilityofsealantsexposedinthedifferenttypesofapparatus.Variationsinresultsmaybeexpectedwhenoperatingconditionsarevariedwithintheacceptedlimitsofthispractice.Therefore,alltestresultsusingthispracticemustbeaccompaniedbyareportofthespecificoperatingconditionsasrequiredinSection10.RefertoPracticeG151fordetailedinformationonthecaveatsapplicabletouseofresultsobtainedaccordingtothispractice.Nolaboratoryexposuretestcanbespecifiedasatotalsimulationofactualuseconditionsinoutdoorenvironments.TherelativedurabilityofmaterialsinactualuseconditionscanvaryindifferentlocationsbecauseofdifferencesinUVradiation,timeofwetness,relativehumidity,temperature,pollutants,andotherfactors.Resultsobtainedfromtheselaboratoryacceleratedexposurescanbeconsideredasrepresentativeofactualuseexposuresonlywhenthedegreeofrankcorrelationhasbeenestablishedforthespecificmaterialsbeingtestedandwhenthefailuremodeisthesame.Exposureofasimilarmaterialofknownoutdoorperformance,acontrol,alongwiththetestspecimensprovidesforevaluationintermsofrelativedurabilityunderthetestconditions,whichalsogreatlyimprovestheagreementintestresultsamongdifferentlaboratories.Theaccelerationfactorrelatingtheexposuretimeinalaboratoryacceleratedtesttoexposuretimeoutdoorsrequiredtoproduceequivalentdegradationismaterialdependentandcanbesignificantlydifferentforeachmaterialandfordifferentformulationsofthesamematerial.Therefore,theaccelerationfactordeterminedforonematerialcannotbeassumedtobeapplicabletoothermaterials.ResultsofthisprocedurewilldependonthecarethatistakentooperatetheequipmentaccordingtoPracticesG152,G154,andG155.Significantfactorsincluderegulationofthelinevoltage,freedomfromsaltorotherdepositsfromwater,temperaturecontrol,humiditycontrol,whereapplicable,conditionandageoftheburnersandfiltersinxenonarcequipment,andageoflampsinfluorescentUVequipment.Note18212;Additionalinformationonsourcesofvariabilityandonstrategiesf.......
【中国标准分类号】:
【国际标准分类号】:91_100_50
【页数】:6P.;A4
【正文语种】: