Designation:D648−07StandardTestMethodforDeflectionTemperatureofPlasticsUnderFlexuralLoadintheEdgewisePosition1ThisstandardisissuedunderthefixeddesignationD648;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationofthetem-peratureatwhichanarbitrarydeformationoccurswhenspeci-mensaresubjectedtoanarbitrarysetoftestingconditions.1.2Thistestmethodappliestomoldedandsheetmaterialsavailableinthicknessesof3mm(1⁄8in.)orgreaterandwhicharerigidorsemirigidatnormaltemperature.NOTE1—Sheetstocklessthan3mm(0.125in.)butmorethan1mm(0.040in.)inthicknessmaybetestedbyuseofacompositesamplehavingaminimumthicknessof3mm.Thelaminaemustbeofuniformstressdistribution.Onetypeofcompositespecimenhasbeenpreparedbycementingtheendsofthelaminaetogetherandthensmoothingtheedgeswithsandpaper.Thedirectionofloadingshallbeperpendiculartotheedgesoftheindividuallaminae.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninbracketsareforinformationonly.1.4Duetothepotentialsafetyandenvironmentalhazardsassociatedwithmercury-filledthermometers,theuseofalter-nativetemperaturemeasuringdevices(suchasthermocouplesorRTDs)isencouraged.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE2—ThetestmethoddescribedasaMethodBofthistestmethod,andtestmethodsAeandBeofISO75-1andISO75-2,1993,aretechnicallyequivalent.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD1898PracticeforSamplingofPlastics(Withdrawn1998)3D5947TestMethodsforPhys...
