ANSI/ASTM D2765-2001 交叉链接的聚乙烯塑料膨胀率和胶含量测定方法

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【英文标准名称】:TestMethodsforDeterminationofGelContentandSwellRatioofCrosslinkedEthylenePlastics
【原文标准名称】:交叉链接的聚乙烯塑料膨胀率和胶含量测定方法
【标准号】:ANSI/ASTMD2765-2001
【标准状态】:现行
【国别】:美国
【发布日期】:2001
【实施或试行日期】:2006
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:含量测定;塑料;试验
【英文主题词】:plastics;determinationofcontent;testing
【摘要】:Thegelcontent(insolublefraction)producedinethyleneplasticsbycrosslinkingcanbedeterminedbyextractingwithsolventssuchasdecahydronaphthaleneorxylenes.Suchextractiontestmethodsaredescribedherein.Theyareapplicabletocrosslinkedethyleneplasticsofalldensities,includingthosecontainingfillers,andallprovidecorrectionsfortheinertfillerspresentinsomeofthosecompounds.TestMethodA,whichpermitsmostcompleteextractioninleasttime,istobeusedforrefereetests,buttwoalternativenonrefereeTestMethodsBandCarealsodescribed.Thefirstofthesediffersfromtherefereetestmethodonlyinsamplepreparation;thatis,itrequiresuseofshavingstakenatselectedpointsincableinsulation,forexample,ratherthanthegroundsamplerequiredbytherefereetestmethod.Becausetheshavedparticlesarelarger,lesstotalsurfacepersampleisexposedtotheextractant,sothistestmethodordinarilyyieldsextractionvaluesabout1to2%lowerthantherefereemethod.Thesecondofthealternativetestmethodsrequiresthataspecimeninonepiecebeextractedinxylenesataconstanttemperatureof110C.Atthistemperatureandwithaone-piecespecimen,evenlessextractionoccurs(from3to9%lessthantherefereetestmethod)butswellratio(ameasureofthedegreeofcrosslinkinginthegelphase)canbedetermined.Extractiontestscanbemadeonarticlesofanyshape.Theyhavebeenparticularlyusefulforelectricalinsulationssincespecimensmaybeselectedfromthoseportionsoftheinsulationmostsusceptibletoinsufficientcrosslinking.ThevaluesstatedinSIunitsaretoberegardedasstandard.Theinch-poundunitsinbracketsareforinformationonly.ISO10147issimilartothistest,butisnotequivalent.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecificprecautionarystatementsaregiveninSections,,and.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:
【正文语种】:英语