Designation:D7408−12(Reapproved2020)StandardSpecificationforNon-ReinforcedPVC(PolyvinylChloride)GeomembraneSeams1ThisstandardisissuedunderthefixeddesignationD7408;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThisspecificationcoverstheminimumvaluesforseamsfabricatedintounreinforcedPVCgeomembranesinfactoryandfieldapplications.1.2ThisspecificationcoversPVCgeomembranesinthick-nessof0.25through1.52mm(0.010through0.060in.).1.3Inadditiontostructuralcharacteristics,thespecifiershallevaluateothercharacteristicsbeyondthescopeofthisspecificationthataffectthefinalchoiceofconstruction.Theseinclude,butarenotlimitedto,functional,legal,insurance,andeconomicconsiderations.1.4Thisspecificationisnotintendedtoexcludeproductsorsystemsnotcoveredbythereferenceddocuments.1.5Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D638TestMethodforTensilePropertiesofPlasticsD882TestMethodforTensilePropertiesofThinPlasticSheetingD4439TerminologyforGeosyntheticsD7176SpecificationforNon-ReinforcedPolyvinylChloride(PVC)GeomembranesUsedinBuriedApplications3.Terminology3.1Definitions...
