Designation:C1303/C1303M−15StandardTestMethodforPredictingLong-TermThermalResistanceofClosed-CellFoamInsulation1ThisstandardisissuedunderthefixeddesignationC1303/C1303M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversaprocedureforpredictingthelong-termthermalresistance(LTTR)ofunfacedorpermeablyfacedrigidgas-filledclosed-cellfoaminsulationsbyreducingthespecimenthicknesstoaccelerateagingundercontrolledlaboratoryconditions(1-5).2NOTE1—SeeTerminology,3.2.1,forthemeaningofthewordagingwithinthisstandard.1.2Rigidgas-filledclosed-cellfoaminsulationincludesallcellularplasticinsulationsmanufacturedwiththeintenttoretainablowingagentotherthanair.1.3Thistestmethodislimitedtounfacedorpermeablyfaced,homogeneousmaterials.Thismethodisappliedtoawiderangeofrigidclosed-cellfoaminsulationtypes,includingbutnotlimitedto:extrudedpolystyrene,polyurethane,polyisocyanurate,andphenolic.Thistestmethoddoesnotapplytoimpermeablyfacedrigidclosed-cellfoamsortorigidclosed-cellbunstockfoams.NOTE2—SeeNote8formoredetailsregardingtheapplicabilityofthistestmethodtorigidclosed-cellbunstockfoams.1.4Thistestmethodutilizesreferencedstandardtestproce-duresformeasuringthermalresistance.Periodicmeasurementsareperformedonspecimenstoobservetheeffectsofaging.Specimensofreducedthickness(thatis,thinslices)areusedtoshortenthetimerequiredfortheseobservations.Theresultsofthesemeasurementsareusedtopredictthelong-termthermalresistanceofthematerial.1.5Thetestmethodisgivenintwoparts.ThePrescriptiveMethodinPartAprovideslong-termthermalresistancevaluesonaconsistentbasisthatcanbeusedforavarietyofpurposes,includingproductevaluation,specifications,orproductcom-parisons.TheResearchMethodinpartBprovidesageneralrelationshipbetweenthermalconductivity,age,andproductthickness.1.5.1TousethePresc...
