Designation:C1263−95(Reapproved2015)StandardTestMethodforThermalIntegrityofFlexibleWaterVaporRetarders1ThisstandardisissuedunderthefixeddesignationC1263;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoversthevisualdeterminationofthethermalintegrityofflexiblewatervaporretardersforthosematerialsclassifiedunderSpecificationC1136,includingplastic,foil,orpaperandcompositesoftwoormoreofthesematerialstotemperatureslistedinthespecificationorpurchasecontract.Thevaporretardersareintendedforuseattempera-turesof−20to150°F(−29to66°C).Thistestmethoddoesnotcovermasticsorbarriercoatingsappliedinliquidformormaterialsintendedforuseasweatherbarriers.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C168TerminologyRelatingtoThermalInsulationC1136SpecificationforFlexible,LowPermeanceVaporRetardersforThermalInsulation3.Terminology3.1Definitions—DefinitionsoftermsusedinthistestmethodwillbefoundinTerminologyC168.4.SignificanceandUse4.1Inmanyapplications,thevaporretardersusedonathermalinsulationwillbeexposedtothetemperatureslistedin7.2.Crackingordelaminationoftheretarderundertheseconditionswould,inmostcases,causeittoloseitseffective-nessasavaporretardermaterial.5.Apparatus5.11in.(25mm)OutsideDiameterSolid,MildSteelMandrel.5.2LaboratoryOven,capableofmaintaining63°F(2°C)uptoatemperatureof150°F(66°C).5.3LaboratoryFreezer,capableofmaintaining63...
