Designation:D746−14StandardTestMethodforBrittlenessTemperatureofPlasticsandElastomersbyImpact1ThisstandardisissuedunderthefixeddesignationD746;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationofthetem-peratureatwhichplasticsandelastomers(asdefinedbyTerminologyD883)exhibitbrittlefailureunderspecifiedimpactconditions.Tworoutineinspectionandacceptanceproceduresarealsoprovided.NOTE1—WhentestingrubbersforimpactbrittlenessuseTestMethodD2137.Whentestingplasticsheetingforimpactbrittleness,useTestMethodD1790.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Duetothepotentialsafetyandenvironmentalhazardsassociatedwithmercury-filledthermometers,theuseofalter-nativetemperaturemeasuringdevices(suchasthermocouplesandRTDs)isencouraged.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE2—ThistestmethodandISO974addressthesamesubjectmatter,butdifferintechnicalcontent.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD832PracticeforRubberConditioningForLowTempera-tureTestingD883TerminologyRelatingtoPlasticsD1790TestMethodforBrittlenessTemperatureofPlasticSheetingbyImpactD2137TestMethodsforRubberProperty—BrittlenessPointofFlexiblePolymersandCoatedFabricsE1SpecificationforASTMLiquid-in-GlassThermometersE77TestMethodforInspectionandVerificationofTher-mometersE608/E608MSpecificationforMineral-Insulated,Metal-SheathedBaseMetalThermocouplesE1137/E1137MSpecificationforIndustrialPlatinumResis-tanceThermometers2.2ISOStandard:ISO974P...
