Designation:D7567−09StandardTestMethodforDeterminingGelContentinCrosslinkedEthylenePlasticsUsingPressurizedLiquidExtraction1ThisstandardisissuedunderthefixeddesignationD7567;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thegelcontentofcrosslinkedethyleneplasticsisdeterminedbysolventextractionwithxyleneortoluene.Thistestmethodisapplicabletoethyleneplasticsofalldensities,includingthosecontainingfillers;providedthefillersareinsolubleintheextractionsolvent(s).1.2Thistestmethodusespressurizedliquidextraction(PLE)toincreasethespeedandreducetheamountofsolventrequiredforsolventextraction.TheresultsofthismethodaresimilartoTestMethodD2765.1.3Extractiontestsshallbeperformedonsamplesofanyshape(see7.2).Specimensshallbeselectedfromthoseportionsofthearticlemostsusceptibletoinsufficientcross-linkingorselectedfromportionsrepresentativeoftheentirearticle.Thistestmethodhasbeendevelopedforproductionandqualitycontrolofcrosslinkedpolyethylenepipebutmaybeapplicabletootherproductssuchasmultilayermaterialsandfibers.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thismethodmakesuseofminimalreagentsandallowsforsolventrecoveryandre-use.Duetotheuseofminimalreagents,healthandsafetyconcernsareminimizedincompari-sontoothermethods.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificprecaution-arystatementsaregiveninSection10.NOTE1—ThereisnoknownISOequivalenttothistestmethod.ThistestmethodissimilartoTestMethodD2765.2.ReferencedDocuments2.1ASTMStandards:2D297TestMethodsforRubberProducts—ChemicalAnaly-sisD618PracticeforCondit...
