Designation:D3982−21StandardSpecificationforContactMolded“Fiberglass”(GlassFiberReinforcedThermosettingResin)Ducts1ThisstandardisissuedunderthefixeddesignationD3982;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoversductsfabricatedbycontactmoldingintendedforuseinhandlingcorrosivefumesandprocessgases.Specialattentionisgiventoequipmentthatoperatesattemperaturesover180°F(82.2°C)withregardtostrengthandcorrosionresistance.1.2Thematerialofconstructionshallbe“fiberglass”con-sistingofapolyester,vinylester,orotherqualifiedresin-matrixsystemswithfiberreinforcementinaccordancewithSpecifi-cationC582.1.3Thisspecificationisnotintendedtocoverselectionofresinsandreinforcementsforspecificchemicalenvironments.1.4Thisspecificationcoversductsuptoadesignpressureof65psig(34.5Pa).1.5Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThereisnoknownISOequivalenttothisstandard.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C581PracticeforDeterminingChemicalResistanceofThermosettingResinsUsedinGlass-Fiber-ReinforcedStructuresIntendedforLiquidServiceC582SpecificationforContact-MoldedReinforcedThermo-setti...
