ASTM C1183-2004(2008) 弹性体密封件挤压比的把试验方法
时间:2024-05-05 12:44:59 来源: 标准资料网 作者：标准资料网 阅读：8519
【英文标准名称】:StandardTestMethodforExtrusionRateofElastomericSealants
【原文标准名称】:弹性体密封件挤压比的把试验方法
【标准号】:ASTMC1183-2004(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【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】:C24.20
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:elastomericsealant;extrusionrate;extrudability;freeze-thawstability;latexsealant;sealant;Elastomericseals/sealants;Extrusions;Sealants
【摘要】:Sealantsaresuppliedwithvariousrheologicalpropertiesrangingfrompourableliquidstononsaggingpastes.Single-componentsealantsaresuppliedreadyforuseuponopeningthecontainer.Multicomponentsealantsaresuppliedasabasecomponent(s)andacuringagentseparatelypackaged.Aftermixingthetwoormoreparts,thesealantisreadyforapplication.Thistestmethodisintendedtoprovideameanstomeasuretheextrusionratespanningtherangeofrheologicalproperties.Thistestmethodalsocoverstheoptionofmeasuringthefreeze-thawandheatstabilityofsuchsealants.Thistestmethodprovidesforanoptionofeitherametalorplasticnozzle.Itisintendedthatthemetalnozzlebeusedwhengreaterprecisionisrequired,suchasinASTMspecifications.Theplasticnozzlemaybeusedforgeneralscreeningofsealantpropertiesorfordevelopmentalpurposeswhenalargenumberoftestspecimensarebeingtested.Thistestmethodmeasuresthevolumeofsealantextrudedin1minatagivenpressure(kPaorpsi).1.1Thistestmethodcoverstwolaboratoryproceduresfordeterminingtheextrusionrateofelastomericsealantsforuseinbuildingconstruction.1.2Thevaluesstatesinmetricunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.4ThereisnoknownISOequivalenttothistestmethod.
【中国标准分类号】:Q24
【国际标准分类号】:21_140
【页数】:3P.;A4
【正文语种】:英语
【英文标准名称】:Hearingaids-Magneticfieldstrengthinaudio-frequencyinductionloopsforhearingaidpurposes
【原文标准名称】:助听器.助听用音频感应环路的磁场强度
【标准号】:BSEN60118-4-1998
【标准状态】:作废
【国别】:英国
【发布日期】:1998-11-15
【实施或试行日期】:1998-11-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:信号传输;磁性器件;音频;频率响应;电感器;磁场强度;无线电干扰;乱真信号;信噪比
【英文主题词】:Acoustics;Audiofrequencies;Audiometry;Electricalengineering;Electroacoustics;Electromagneticinduction;Fieldstrength(electric);Frequencies;Hearingaids;Induction;Inductionloops;Magneticfieldmeasurement;Magneticfieldstrength;Magneticfields;Measurement;Measuringtechniques;Radiotelephony;Voicefrequency
【摘要】:Givesastandardvalueofmagneticfieldstrengthinaudio-frequencyinductionloopsforhearingaidpurposesthatwillgiveanadequatesignal-to-noiseratiowithoutoverloadingthehearingaid.
【中国标准分类号】:L31
【国际标准分类号】:11_180_15
【页数】:8P.;A4
【正文语种】:英语
【英文标准名称】:StandardPracticeforExposingNonmetallicMaterialsinAcceleratedTestDevicesthatUseLaboratoryLightSources
【原文标准名称】:使非金属材料暴露于使用实验室光源的加速试验装置的标准实施规程
【标准号】:ASTMG151-2010
【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】:G03.03
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:accelerated;durability;exposure;light;temperature;weathering;ultraviolet;UV-radiation;Durability;Laboratoryaging/weathering;Lightexposure;Acceleratedweathering;Lightfastness;Nonmetallicmaterials;Weathering
【摘要】:Significance:Whenconductingexposuresindevicesthatuselaboratorylightsources,itisimportanttoconsiderhowwelltheacceleratedtestconditionswillreproducepropertychangesandfailuremodesassociatedwithend-useenvironmentsforthematerialsbeingtested.Inaddition,itisessentialtoconsidertheeffectsofvariabilityinboththeacceleratedtestandoutdoorexposureswhensettingupexposureexperimentsandwheninterpretingtheresultsfromacceleratedexposuretests.Nolaboratoryexposuretestcanbespecifiedasatotalsimulationofactualuseconditionsinoutdoorenvironments.Resultsobtainedfromtheselaboratoryacceleratedexposurescanbeconsideredasrepresentativeofactualuseexposuresonlywhenthedegreeofrankcorrelationhasbeenestablishedforthespecificmaterialsbeingtestedandwhenthetypeofdegradationisthesame.TherelativedurabilityofmaterialsinactualuseconditionscanbeverydifferentindifferentlocationsbecauseofdifferencesinUVradiation,timeofwetness,relativehumidity,temperature,pollutants,andotherfactors.Therefore,evenifresultsfromaspecificexposuretestconductedaccordingtothispracticearefoundtobeusefulforcomparingtherelativedurabilityofmaterialsexposedinaparticularexteriorenvironment,itcannotbeassumedthattheywillbeusefulfordeterminingrelativedurabilityofthesamematerialsforadifferentenvironment.Eventhoughitisverytempting,calculationofanaccelerationfactorrelatingxhormegajoulesofradiantexposureinalaboratoryacceleratedtesttoymonthsoryearsofexteriorexposureisnotrecommended.Theseaccelerationfactorsarenotvalidforseveralreasons.Accelerationfactorsarematerialdependentandcanbesignificantlydifferentforeachmaterialandfordifferentformulationsofthesamematerial.Variabilityintherateofdegradationinbothactualuseandlaboratoryacceleratedexposuretestcanhaveasignificanteffectonthecalculatedaccelerationfactor.Accelerationfactorscalculatedbasedontheratioofirradiancebetweenalaboratorylightsourceandsolarradiation,evenwhenidenticalbandpassesareused,donottakeintoconsiderationtheeffectsonamaterialofirradiance,temperature,moisture,anddifferencesinspectralpowerdistributionbetweenthelaboratorylightsourceandsolarradiation.Note48212;Ifuseofanaccelerationfactorisdesiredinspiteofthewarningsgiveninthispractice,suchaccelerationfactorsforaparticularmaterialareonlyvalidiftheyarebasedondatafromasufficientnumberofseparateexteriorandlaboratoryacceleratedexposuressothatresultsusedtorelatetimestofailureineachexposurecanbeanalyzedusingstatisticalmethods.AnexampleofastatisticalanalysisusingmultiplelaboratoryandexteriorexposurestocalculateanaccelerationfactorisdescribedbyJ.A.Simms(1).Thereareanumberoffactorsthatmaydecreasethedegreeofcorrelationbetweenacceleratedtestsusinglaboratorylightsourcesandexteriorexposures.MorespecificinformationonhoweachfactormayalterstabilityrankingofmaterialsisgiveninAppendixX1.Differencesinthespectraldistributionbetweenthelaboratorylightsourceandsolarradiation.Lightintensitieshigherthanthoseexperiencedinactualuseconditions.Testconditionswherespecimensareexposedcontinuouslytolightwhenactualuseconditionsprovidealternateperiodsoflightanddark.Specimentemperatureshigherthanthoseinactualconditions.Exposureconditionsthatproduceunrealistict.......
【中国标准分类号】:A21
【国际标准分类号】:19_040
【页数】:15P.;A4
【正文语种】:英语