Designation:D6474−12StandardTestMethodforDeterminingMolecularWeightDistributionandMolecularWeightAveragesofPolyolefinsbyHighTemperatureGelPermeationChromatography1ThisstandardisissuedunderthefixeddesignationD6474;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofmolecularweightdistributionsandmolecularweightaveragesoflinearpolyolefinsbyhightemperaturegelpermeationchromatogra-phy(GPC).Thistestmethodusescommerciallyavailablepolystyrenestandardsandequipmentandisapplicabletopolyethylenes(excludinghighpressurelowdensitypolyethyl-ene–LDPE)andpolypropylenessolublein1,2,4-trichlorobenzene(TCB)at140°C.Thistestmethodisnotabsoluteandrequirescalibration.NOTE1—Sizeexclusionchromatography(SEC)oftenisusedasanalternativenameforgelpermeationchromatography(GPC).NOTE2—Specificmethodsandcapabilitiesofusersmayvarywithdifferencesincolumns,instrumentation,applicationssoftware,andprac-ticesbetweenlaboratories.NOTE3—Onegeneralmethodisoutlinedherein;alternativeanalyticalpracticescanbefollowedandareattachedinnoteswhereappropriate.NOTE4—ThereisnoknownISOequivalenttothisstandard.1.2ThevaluesstatedinSIunits,basedonIEEE/ASTMS1-10,aretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D883TerminologyRelatingtoPlasticsD3016PracticeforUseofLiquidExclusionChromatogra-phyTermsandRelationshipsD5296TestMethodforMolecularWeightAveragesandMolecularWeightDistributionofPolystyrenebyHighPerformanceSize-ExclusionChromatographyE685PracticeforTestingFixed-WavelengthPhotometricDetectorsUsedinLiquidChr...
