Designation:C1136−17StandardSpecificationforFlexible,LowPermeanceVaporRetardersforThermalInsulation1ThisstandardisissuedunderthefixeddesignationC1136;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationcoversvaporretardersforthermalinsulation,specifically,flexiblematerialswithpermeanceof0.10permorlowerandsurfaceburningcharacteristicsof25flamespread/50smokeorlower.Thesematerialsareintendedforuseatsurfacetemperaturesof−20to150°F(−29to66°C).Itdoesnotcovermasticsorbarriercoatingsappliedinliquidform,normaterialsintendedforuseasweatherbarriers.1.2ThisisamaterialspecificationanddoesnotimplythataninstalledsystemusingthesematerialswillprovidethephysicalpropertiesspecifiedinSection6.1.3Thisspecificationprovidesphysicalrequirementsforvaporretarders.PracticeC755providesassistanceinsolvingproblemsrelatedtomoisturevaportransmissionthroughther-malinsulationmaterials.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thefollowingprecautionarycaveatpertainstothetestmethodsportiononly,Section10,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocum...
