【英文标准名称】:StandardTestMethodforAnalysisofIsopropylbenzene(Cumene)byGasChromatography(ExternalStandard)
【原文标准名称】:气相色谱法分析异丙基苯的标准试验方法
【标准号】:ASTMD7057-2004
【标准状态】:现行
【国别】:
【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】:D16.07
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:alpha-methylstyrene;analysisbygaschromatography;benzene;butylbenzene;cumene;cymene;diisopropylbenzene;ethylbenzene;isopropylbenzene;methylcumene;nonaromatichydrocarbons;propylbenzene;toluene
【摘要】:Thistestmethodissuitableforsettingspecificationsonthematerialsreferencedin1.2andforuseasaninternalqualitycontroltoolwhereisopropylbenzeneisproducedorisusedinamanufacturingprocess.Itmayalsobeusedindevelopmentorresearchworkinvolvingisopropylbenzene.Thistestmethodisusefulindeterminingthepurityofisopropylbenzenewithnormalimpuritiespresent.Ifextremelyhighboilingorunusualimpuritiesarepresentintheisopropylbenzene,thistestmethodwouldnotnecessarilydetectthemandthepuritycalculationwouldbeerroneous.Cumenehydroperoxide,ifpresent,willyieldthermaldecompositionproducts,primarilyAPandDMPCasstatedin4.1,thatwilleluteinthechromatogramtherebygivingincorrectresultsunlesstheyareexcludedasindicatedin4.1.Itisalsopossibletogeterroneousresultsfortracealpha-methylstyrenepresentinisopropylbenzeneiftheinlethasbecomeundulycontaminatedwithnon-volatileforeignsubstances.Thenonaromatichydrocarbonscommonlypresentfromtheisopropylbenzenemanufacturingprocess,particularlyanon-zeoliticone,willinterferewiththedeterminationofxylenes(ifpresent).1.1Thistestmethodcoversthedeterminationofthepurityofisopropylbenzene(cumene)bygaschromatography.Calibrationofthegaschromatographysystemisdonebytheexternalstandardcalibrationtechnique.1.2Thistestmethodhasbeenfoundapplicabletothemeasurementofimpuritiessuchasnonaromatichydrocarbons,benzene,toluene,ethylbenzene,phenol,cymenes,t-butylbenzene,n-butylbenzene,n-propylbenzene,alpha-methylstyrene,sec-butylbenzene,anddiisopropylbenzenes,whichareimpuritiesthatcanbefoundinisopropylbenzene.Thelatterimpuritiescanbeanalyzedoverarangeof1mg/kgto500mg/kgbythismethod(seeTable1).ThelimitofdetectionfortheseimpuritiesissummarizedinTable1aswell.1.3Indeterminingtheconformanceofthetestresultsusingthismethodtoapplicablespecifications,resultsshallberoundedoffinaccordancewiththerounding-offmethodofPracticeE29.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection8.
【中国标准分类号】:G16
【国际标准分类号】:71_080_15(AROMATICHYDROCARBONS)
【页数】:4P.;A4
【正文语种】:


【英文标准名称】:NaturalBlockMicaandMicaFilmsSuitableforUseinFixedMica-DielectricCapacitors
【原文标准名称】:固定式云母介电电容器用天然云母块和云母薄片
【标准号】:ASTMD748-1971
【标准状态】:作废
【国别】:美国
【发布日期】:1971
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:天然云母;绝缘;电绝缘;覆层;电气工程;云母;云母电容器;天然;电容器;云母片
【英文主题词】:capacitors;naturalglimmer;electricalinsulation;mica;micafolium;micacapacitors;coatings;natural;insulations;electricalengineering
【摘要】:
【中国标准分类号】:L11;D53
【国际标准分类号】:73_080
【页数】:8P;A4
【正文语种】:英语