Designation:F336−02(Reapproved2009)StandardPracticeforDesignandConstructionofNonmetallicEnvelopedGasketsforCorrosiveService1ThisstandardisissuedunderthefixeddesignationF336;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversthedesigns,sizes,classifications,andconstructionofenvelopedgasketsforseverecorrosiveapplications.Theenvelopeservesasthecorrosionresistantmemberofthecompositegasketandisanonmetallicmaterialsuchaspolytetrafluoroethylene,PTFE,orrelatedmaterials.Theinsertsarenonmetallicgasketingmaterialswithorwithoutmetalreinforcement.OthertypesofcompositegasketsarecoveredinClassificationF868.1.2ThisstandardisbaseddirectlyuponANSIB16.21–1992;forthatreasonunitsareasANSIstatedininches.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D3294SpecificationforPolytetrafluoroethylene(PTFE)ResinMoldedSheetandMoldedBasicShapesD3308SpecificationforPTFEResinSkivedTapeF104ClassificationSystemforNonmetallicGasketMateri-alsF112TestMethodforSealabilityofEnvelopedGasketsF868ClassificationforLaminatedCompositeGasketMate-rials2.2OtherDocument:ASMEB16.21–1992NonmetallicFlatGasketsforPipeFlanges33.SignificanceandUse3.1Thegasketscoveredbythispracticecanbeusedon,butarenotlimitedto,equipmentconstructedofthefollowingmaterials:(a)stoneware,(b)glassandglass-lined,(c)tantalum(solidandlined),(d)titanium(solidandlinedorclad),(e)zirconium(solidandlinedorclad),(f)silver(solidandlined),and(g)nickelandnickelalloys(solidandclad).3.2Thegasketsprovidedforhereinareforthefollowing:(a)pipeflanges(flatorraisedface),(b)vesselnozzles,(c)circularop...
