Designation:D1043−10StandardTestMethodforStiffnessPropertiesofPlasticsasaFunctionofTemperaturebyMeansofaTorsionTest1ThisstandardisissuedunderthefixeddesignationD1043;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationofthestiff-nesscharacteristicsofplasticsoverawidetemperaturerangebydirectmeasurementoftheapparentmodulusofrigidity.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThistestmethodandISO458-1andISO458-2addressthesamesubjectmatter,butdifferintechnicalcontent.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD638TestMethodforTensilePropertiesofPlasticsD747TestMethodforApparentBendingModulusofPlas-ticsbyMeansofaCantileverBeamD883TerminologyRelatingtoPlasticsD1053TestMethodsforRubberProperty—StiffeningatLowTemperatures:FlexiblePolymersandCoatedFabricsD4000ClassificationSystemforSpecifyingPlasticMateri-als3.Terminology3.1Definitions—Fordefinitionsofthetechnicaltermsper-tainingtoplasticsusedinthistestmethod,seeTerminologyD883.4.SignificanceandUse4.1Thepropertymeasuredbythistestistheapparentmodulusofrigidity,G,sometimescalledtheapparentshearmodulusofelasticity.Itisimportanttonotethatthispropertyisnotthesameasthemodulusofelasticity,E,measuredintension,flexure,orcompression.TherelationshipbetweenthesepropertiesisshowninAnnexA1.4.2Themeasuredmodulusofrigidityistermed“apparent”sinceitisthevalueobtainedbymea...
