Designation:D5419−14aStandardTestMethodforEnvironmentalStressCrackResistance(ESCR)ofThreadedPlasticClosures1ThisstandardisissuedunderthefixeddesignationD5419;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethoddeterminesthesusceptibilityofthreadedplasticclosurestofailureduetoenvironmentalstresscracking(ESC).1.2Inuse,threadedplasticclosurescancontactagentsthatappreciablyreducethestressatwhichcracksform.Examplesofsuchagentsare:soaps,detergents,oils,andliquidbleaches.1.3Majorfactorsthatinfluenceenvironmentalstresscrackresistance(ESCR)ofthreadedplasticclosuresincludetheclosurematerial(s),closuredesign,molded-instress,andappliedstress.1.4Thisprocedurecanbeappliedtoallclosures,butisparticularlyapplicabletoclosuresmadefromplasticsbasedonpolypropylene(PP)orpolystyrene(PS).1.5Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificprecau-tionarystatementsaregiveninSection8and6.2.NOTE1—ThereisnoknownISOequivalenttothisstandard.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD1600TerminologyforAbbreviatedTermsRelatingtoPlas-ticsD2911SpecificationforDimensionsandTolerancesforPlasticBottlesE145SpecificationforGravity-ConvectionandForced-VentilationOvensE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1Definitions—Exceptforthosetermsbelow,seeTermi-nologiesD883andD1600.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1assembly—closurea...
