Designation:D3532/D3532M−19StandardTestMethodforGelTimeofCarbonFiber-EpoxyPrepreg1ThisstandardisissuedunderthefixeddesignationD3532/D3532M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationofgeltimeofcarbonfiber-epoxytapeandsheet.Thetestmethodissuitableforthemeasurementofgeltimeofresinsystemshavingeitherhighorlowviscosity.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequivalents;therefore,toensureconformancewiththestandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.2.1Withinthetext,inch-poundunitsareshowninbrack-ets.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3531/D3531MTestMethodforResinFlowofCarbonFiber-EpoxyPrepregD4473TestMethodforPlastics:DynamicMechanicalProp-erties:CureBehaviorD7750TestMethodforCureBehaviorofThermosettingResinsbyDynamicMechanicalProceduresusinganEncapsulatedSpecimenRheometer3.SummaryofTestMethod3.1Aspecimenofprepregmaterialapproximately5mm[0.25in.]squareisplacedbetweenmicroscopecoverglassesonahotplatepreheatedtoeitheroftwotesttemperatures,120or175°C[250or3...
