【英文标准名称】:StandardTestMethodforDeterminingGelContentinCrosslinkedEthylenePlasticsUsingPressurizedLiquidExtraction
【原文标准名称】:用加压溶剂萃取法测定交联乙烯塑料中凝胶含量的标准试验方法
【标准号】:ASTMD7567-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:D20.70
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:Manyimportantpropertiesofcrosslinkedethyleneplasticsvarywiththegelcontent.Hence,determinationofthegelcontentprovidesameansofbothcontrollingtheprocessandratingthequalityoffinishedproducts.Extractiontestspermitverificationofthedesiredgelcontentofanygivencrosslinkedethyleneplasticandtheyalsopermitcomparisonbetweendifferentcrosslinkedethyleneplastics,includingthosecontainingfillers,providedthat,forthelatter,thefollowingconditionsaremet:Thefillerisnotsolubleinxyleneortolueneattheextractiontemperatureandtheamountoffillerpresentinthecompoundisknownorcanbedetermined.Sufficientcrosslinkinghasbeenachievedtopreventmigrationoffillerduringtheextraction.Usuallyithasbeenfoundthat,atextractionlevelsupto50%,theextractionsolventremainsclearandfreeoffiller.Sincesomeoxidativedegradationofthematerialcanoccurattheextractiontemperaturesusedinthisprocedure,despitetheuseofaclosedcellwhichallowsforminimalintroductionofoxygen,asuitableantioxidantisaddedtothesolventtoinhibitsuchdegradation.Beforeproceedingwiththismethod,referenceshouldbemadetothespecificationofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparameters,orcombinationthereof,coveredinthematerialsspecificationshalltakeprecedenceoverthosementionedinthistestmethod.Iftherearenomaterialspecifications,thenthedefaultconditionsapply1.1Thegelcontentofcrosslinkedethyleneplasticsisdeterminedbysolventextractionwithxyleneortoluene.Thistestmethodisapplicabletoethyleneplasticsofalldensities,includingthosecontainingfillers;providedthefillersareinsolubleintheextractionsolvent(s).1.2Thistestmethodusespressurizedliquidextraction(PLE)toincreasethespeedandreducetheamountofsolventrequiredforsolventextraction.TheresultsofthismethodaresimilartoTestMethodD2765.1.3Extractiontestsshallbeperformedonsamplesofanyshape(see7.2).Specimensshallbeselectedfromthoseportionsofthearticlemostsusceptibletoinsufficientcrosslinkingorselectedfromportionsrepresentativeoftheentirearticle.Thistestmethodhasbeendevelopedforproductionandqualitycontrolofcrosslinkedpolyethylenepipebutmaybeapplicabletootherproductssuchasmultilayermaterialsandfibers.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thismethodmakesuseofminimalreagentsandallowsforsolventrecoveryandre-use.Duetotheuseofminimalreagents,healthandsafetyconcernsareminimizedincomparisontoothermethods.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecificprecautionarystatementsaregiveninSection10.Note18212;ThereisnoknownISOequivalenttothistestmethod.ThistestmethodissimilartoTestMethodD2765.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:5P.;A4
【正文语种】:英语