Designation:D710−13StandardSpecificationforVulcanizedFibreSheets,Rods,andTubesUsedforElectricalInsulation1ThisstandardisissuedunderthefixeddesignationD710;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoversvulcanizedfibre(Note1)sheets,roundrods,androundtubesofsuchgradessuitableforuseaselectricalinsulation.NOTE1—Thevariantspelling“fibre”hasbeenapprovedbyCommitteeD09foruseinthisstandard.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.2.ReferencedDocuments2.1ASTMStandards:2D495TestMethodforHigh-Voltage,Low-Current,DryArcResistanceofSolidElectricalInsulationD619TestMethodsforVulcanizedFibreUsedforElectricalInsulationD696TestMethodforCoefficientofLinearThermalExpan-sionofPlasticsBetween−30°Cand30°CwithaVitreousSilicaDilatometerD952TestMethodforBondorCohesiveStrengthofSheetPlasticsandElectricalInsulatingMaterialsD3636PracticeforSamplingandJudgingQualityofSolidElectricalInsulatingMaterials2.2OtherDocuments:3IEEEPublicationNo.1,“GeneralPrinciplesforTempera-tureLimitsintheRatingofElectricalEquipment.”3.Terminology3.1Definitions:3.1.1vulcanizedfibre,n—amaterialmadefromchemicallygelatinizedcellulosicpaperorboardusingzincchlorideasthegelatinizingagent.3.1.1.1Discussion—Thezincchlorideissubsequentlyre-movedbyleaching.Theresultingproduct,afterbeingdriedandfinishedbycalendering,isamaterialofpartiallyregener-atedcelluloseinwhichthefibrousstructureisretainedinvaryingdegreesdependingonthegradeofpaperusedandontheprocessingconditions.Materialuptoabout25mminthicknessisproducedbybondingmultiplelayersofpaper(orboard)afterchemicaltreatm...
