Designation:E1981−98(Reapproved2012)´2StandardGuideforAssessingThermalStabilityofMaterialsbyMethodsofAcceleratingRateCalorimetry1ThisstandardisissuedunderthefixeddesignationE1981;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditorialcorrectionsweremadetosourceandreferenceinformationinDecember2012.ε2NOTE—EditorialcorrectionsweremadethroughoutinJune2013.INTRODUCTIONThisguideisoneofseveralstandardsbeingdevelopedbyASTMCommitteeE27fordeterminingthephysicochemicalhazardsofchemicalsandchemicalmixtures.Thisguideshouldbeusedinconjunctionwithothertestmethods,asacompleteassessmentofthehazardpotentialofchemicalsmusttakeintoaccountanumberofrealisticfactorsnotnecessarilyconsideredinthisguide.Theexpressionhazardpotentialasusedbythiscommitteeisdefinedasthedegreeofsusceptibilityofmaterialtoignitionorreleaseofenergyundervaryingenvironmentalconditions.Itistheintentofthisguidetoincludeanycalorimetricdeviceconsistentwiththeprinciplesofadiabaticcalorimetry.Device-specificinformationandspecificationsarelocatedinappendicestotheguide.Anyreferencetospecificdevicesintheguideareforpurposesofillustrationorclarityonly.1.Scope1.1Thisguidecoverssuggestedproceduresfortheopera-tionofacalorimetricdevicedesignedtoobtaintemperatureandpressuredataasafunctionoftimeforsystemsundergoingaphysicochemicalchangeundernearlyadiabaticconditions.1.2Thisguideoutlinesthecalculationofthermodynamicparametersfromthetime,temperature,andpressuredatarecordedbyacalorimetricdevice.1.3Theassessmentoutlinedinthisguidemaybeusedoverapressurerangefromfullvacuumtotheratedpressureofthereactioncontainerandpressuretransducer.Thetemperaturerangeofthecalorimetertypicallyvariesfromambientto500°C,butalsomaybeuserspecified(see6.6).1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementarein...
