Designation:C203−05a(Reapproved2012)StandardTestMethodsforBreakingLoadandFlexuralPropertiesofBlock-TypeThermalInsulation1ThisstandardisissuedunderthefixeddesignationC203;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscoverthedeterminationofthebreakingloadandcalculatedflexuralstrengthofarectangularcrosssectionofapreformedblock-typethermalinsulationtestedasasimplebeam.Itisalsoapplicabletocellularplastics.Twotestmethodsaredescribedasfollows:1.1.1TestMethodI—Aloadingsystemutilizingcenterloadingonasimplysupportedbeam,supportedatbothends.1.1.2TestMethodII—Aloadingsystemutilizingtwosym-metricloadpointsequallyspacedfromtheiradjacentsupportpointsateachendwithadistancebetweenloadpointsofonehalfofthesupportspan.1.2Eithertestmethodiscapableofbeingusedwiththefourproceduresthatfollow:1.2.1ProcedureA—Designedprincipallyformaterialsthatbreakatcomparativelysmalldeflections.1.2.2ProcedureB—Designedparticularlyforthosemateri-alsthatundergolargedeflectionsduringtesting.1.2.3ProcedureC—Designedformeasuringataconstantstressrate,usingaCRL(constantrateofloading)machine.Usedforbreakingloadmeasurementsonly.1.2.4ProcedureD—Designedformeasurementsatacon-stantcrossheadspeed,usingeitheraCRT(constantrateoftraverse)orCRE(constantrateofextension)machine.Usedforbreakingloadmeasurementsusingafixedcrossheadspeedmachine.1.3Comparativetestsarecapableofbeingrunaccordingtoeithermethodorprocedure,providedthatthemethodorprocedureisfoundsatisfactoryforthematerialbeingtested.1.4Thesetestmethodsarepurposelygeneralinordertoaccommodatethewidelyvaryingindustrypractices.Itisimportantthattheuserconsulttheappropriatematerialsspecificationforanyspecificdetailedrequirementsregardingthesetestmethods.1.5Thev...
