Designation:D202−17StandardTestMethodsforSamplingandTestingUntreatedPaperUsedforElectricalInsulation1ThisstandardisissuedunderthefixeddesignationD202;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thesetestmethodscoverproceduresforsamplingandtestinguntreatedpapertobeusedasanelectricalinsulatororasaconstituentofacompositematerialusedforelectricalinsulatingpurposes.1.1.1Untreatedpapersarethin,fibroussheetsnormallylaiddownfromawatersuspensionofpulpedfibers(usuallycellulosic)withorwithoutvariousamountsofnonfibrousingredients,andwhicharecalendared,ifrequired,toobtaindesiredthicknessanddensity.Nevertheless,thesetestmethodsareapplicable,generallyalthoughnotinvariably,topapersformedbyothermeans,topapersmodified(duringorafterformation)byadditions,andtopapersgivensubsequentmechanicaltreatmentssuchascreping.1.1.2Asanelectricalinsulatinganddielectricmaterial,paperisconsidered“untreated”untilitissubjectedtoamanufacturingprocesssuchasdrying,impregnation,orvar-nishtreatment.1.1.3Thetestmethodsgivenhereinweredevelopedspe-cificallyforpapershavingathicknessof0.75mm(0.030in.)orless.Anumberofthesetestmethodsarealsosuitableforuseonothermaterialssuchaspulpsorboards.RefertoTestMethodsD3376orD3394todeterminewhichtestsareapplicabletopulpsorelectricalinsulatingboards.Inthepaperindustry,someproductsinthicknessesoflessthan0.75mmaretermed“paperboard”.Suchproductsareincludedwithinthescopeofthesemethods.1.1.4Thesetestmethodsareapplicabletoflexiblefibrous-matmaterialsformedfromsuspensionsoffiberinfluidsotherthanwater.Thicknessesofthesematsapproach2mm,andthefiberscontainedarepossiblynatural,synthetic,organic,orinorganic;fillersthatarenatural,synthetic,organic,orinor-ganic;andflexiblepolymericbindermater...
