Designation:D1668/D1668M−97a(Reapproved2021)StandardSpecificationforGlassFabrics(WovenandTreated)forRoofingandWaterproofing1ThisstandardisissuedunderthefixeddesignationD1668/D1668M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.ThisspecificationreplacesFederalSpecificationHH-C-466.1.Scope1.1Thisspecificationcoversfinishedtreated(coated)woven-glassfabricscoatedwitheitherasphalt,coal-tarpitch,oranorganicresincompatiblewiththeroofing,waterproofing,orotherusageasspecifiedbythepurchaser.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD146/D146MTestMethodsforSamplingandTestingBitumen-SaturatedFeltsandWovenFabricsforRoofingandWaterproofingD579/D579MSpecificationforGreigeWovenGlassFabricsD1079TerminologyRelatingtoRoofingandWaterproofingD3775TestMethodforEnd(Warp)andPick(Filling)CountofWovenFabricsD3776/D3776MTestMethodsforMassPerUnitArea(Weight)ofFabric3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthisspecification,refertoTerminologyD123orD1079.4.ClassificationofFabricTreatmentswithGenerallyApplicableUsage4.1TypeI,AsphaltTreated—TypeIissuitableforusewithallasphaltsandasphalt-basedcompounds.4.2TypeII,Coal-TarPitchTreate...
