Designation:C1114−06(Reapproved2013)StandardTestMethodforSteady-StateThermalTransmissionPropertiesbyMeansoftheThin-HeaterApparatus1ThisstandardisissuedunderthefixeddesignationC1114;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthesteady-statethermaltransmissionpropertiesofflat-slabspecimensofthermalinsulationusingathinheaterofuniformpowerdensityhavinglowlateralheatflow.Athinheaterwithlowlateralthermalconductancecanreduceunwantedlateralheatflowandavoidtheneedforactive-edgeguarding.1.2Thisprimarytestmethodofthermal-transmissionmea-surementdescribesaprinciple,ratherthanaparticularappa-ratus.Theprincipleinvolvesdeterminationofthethermalfluxacrossaspecimenofknownthicknessandthetemperaturesofthehotandcoldfacesofthespecimen.1.3Considerablelatitudeisgiventothedesigneroftheapparatusinthistestmethod;sinceavarietyofdesignsispossible,aprocedureforqualifyinganapparatusisgivenin5.3.1.4Thespecimensmustmeetthefollowingconditionsifthermalresistanceorthermalconductanceofthespecimenistobedeterminedbythistestmethod2:1.4.1Theportionofthespecimenovertheisothermalareaoftheheatermustaccuratelyrepresentthewholespecimen.1.4.2Theremainderofthespecimenshouldnotdistorttheheatflowinthatpartofthespecimendefinedin1.4.1.1.4.3Thespecimenshallbethermallyhomogeneoussuchthatthethermalconductivityisnotafunctionofthepositionwithinthesample,butrathermaybeafunctionofdirection,time,andtemperature.Thespecimenshallbefreeofholes,ofhigh-densityvolumes,andofthermalbridgesbetweenthetestsurfacesorthespecimenedges.1.4.4TestMethodC177describesteststhatcanhelpascer-tainwhetherconditionsof1.4aresatisfied.Forthepurposesofthistestmethod,differencesinthemeasurementsoflessthan2%maybeconsideredinsignificant,andtherequirementsfulfilled.1.5Thespecimensshallmeetoneoft...
