Designation:D3045−18StandardPracticeforHeatAgingofPlasticsWithoutLoad1ThisstandardisissuedunderthefixeddesignationD3045;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thispracticeisintendedtodefinetheexposurecondi-tionsforevaluatingthethermalenduranceofplasticswhenexposedsolelytohotairforextendedperiodsoftime.Onlytheprocedureforheatexposureisspecified.Theeffectofelevatedtemperatureonanyparticularpropertyisdeterminedbyselectionoftheappropriatetestmethodandtestspecimensforthatproperty.1.2Thispracticecanbeusedasaguidetocomparethermalagingcharacteristicsofmaterialsasmeasuredbythechangeinsomepropertyofinterest.Thepropertyofinterestismeasuredatroomtemperature.1.3Thispracticerecommendsproceduresforcomparingthethermalagingcharacteristicsofmaterialsatasingletempera-ture.Recommendedproceduresfordeterminingthethermalagingcharacteristicsofamaterialusingaseriesofelevatedtemperaturesforthepurposeofestimatingendurancetimetoadefinedpropertychangeatalowertemperaturearealsodescribed;theapplicabilityoftheArrheniusrelationformakingpredictionstoothertemperatures,isassumedinthiscase.1.4Thispracticedoesnotpredictthermalagingcharacter-isticswhereinteractionsbetweenstress,environment,temperature,andtimecontrolfailureoccur.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—ThisstandardandISO-2578addressthesamesubjectmatterbutdifferintechnicalcontent.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrincipl...
