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【英文标准名称】:Methodsofmeasuringandexpressingtheperformanceofradioreceiversforsoundbroadcasting.Generalconditions
【原文标准名称】:无线电声音广播接收机性能的测定及表示方法.第1部分:一般条件
【标准号】:BS4054Pt.1-1980
【标准状态】:作废
【国别】:英国
【发布日期】:1980-06-30
【实施或试行日期】:
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:M74
【国际标准分类号】:
【页数】:68P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforDeterminingAutomotiveEngineOilCompatibilitywithTypicalSealElastomers
【原文标准名称】:测定车用机油与典型弹性密封件的兼容性的标准试验方法
【标准号】:ASTMD7216-2010
【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】:D02.B0.07
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:automotiveengineoil;compatibility;elastomer;engineoil;immersion;seal(s);Automotiveenginefuels/oils;Compatibility--petroleumproducts;Elastomericseals/sealants
【摘要】:Someengineoilformulationshavebeenshowntolackcompatibilitywithcertainelastomersusedforsealsinautomotiveengines.Thesedeleteriouseffectsontheelastomeraregreatestwithnewengineoils(thatis,oilsthathavenotbeenexposedtoanenginex2019;soperatingenvironment)andwhentheexposureisatelevatedtemperatures.Thistestmethodrequiresthatnon-referenceoil(s)betestedinparallelwithareferenceoil,TMC1006-1,knowntobeaggressiveforsomeparametersunderserviceconditions.Thisrelativecompatibilitypermitsdecisionsontheanticipatedorpredictedperformanceofthenon-referenceoilinservice.Elastomermaterialscanshowsignificantvariationinphysicalproperties,notonlyfrombatch-to-batchbutalsowithinasheetandfromsheet-to-sheet.ResultsobtainedwiththereferenceoilaresubmittedbythetestlaboratoriestotheTMCtoallowittoupdatecontinuallythetotalandwithin-laboratorystandarddeviationestimates.Theseestimates,therefore,incorporateeffectsofvariationsinthepropertiesofthereferenceelastomersonthetestvariability.Thistestmethodissuitableforspecificationcompliancetesting,qualitycontrol,refereetesting,andresearchanddevelopment.Thereferenceelastomers,referenceoilandthephysicalpropertiesinvolvedinthistestmethodaddressthespecificrequirementsofengineoils.Althoughothertestsexistforcompatibilityofelastomerswithliquids,theseareconsideredtoogeneralizedforengineoils.1.1Thistestmethodcoversquantitativeproceduresfortheevaluationofthecompatibilityofautomotiveengineoilswithseveralreferenceelastomerstypicalofthoseusedinthesealingmaterialsincontactwiththeseoils.Compatibilityisevaluatedbydeterminingthechangesinvolume,DurometerAhardnessandtensilepropertieswhentheelastomerspecimensareimmersedintheoilforaspecifiedtimeandtemperature.1.2Effectivesealingactionrequiresthatthephysicalpropertiesofelastomersusedforanysealhaveahighlevelofresistancetotheliquidoroilinwhichtheyareimmersed.Whensuchahighlevelofresistanceexists,theelastomerissaidtobecompatiblewiththeliquidoroil.Note18212;TheuserofthistestmethodshouldbeproficientintheuseofTestMethodsD412(tensileproperties),D471(effectofrubberimmersioninliquids),D2240(Durometerhardness),andD5662(gearoilcompatibilitywithtypicaloilsealelastomers),allofwhichareinvolvedintheexecutionoftheoperationsofthistestmethod.1.3Thistestmethodprovidesapreliminaryorfirstorderevaluationofoil/elastomercompatibilityonly.Becausesealsmaybesubjectedtostaticordynamicloads,orboth,andtheymayoperateoverarangeofconditions,acompleteevaluationofthepotentialsealingperformanceofanyelastomer-oilcombinationinanyserviceconditionusuallyrequirestestsadditionaltothosedescribedinthistestmethod.1.4Theseveralreferenceelastomerformulationsspecifiedinthistestmethodwerechosentoberepresentativeofthoseusedinbothheavy-dutydieselenginesandpassenger-carspark-ignitionengines(thelatterarecoveredinAnnexA2).Theproceduresdescribedinthistestmethodcan,however,alsobeusedtoevaluatethecompatibilityofautomotiveengineoilswithdifferentelastomertypes/formulations......
【中国标准分类号】:E34
【国际标准分类号】:75_100
【页数】:12P.;A4
【正文语种】:英语