Designation:D2771–90(Reapproved1997)e1AnAmericanNationalStandardStandardTestMethodsforCompactionDensityofElectricalGradeMagnesiumOxide1ThisstandardisissuedunderthefixeddesignationD2771;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.e1NOTE—KeywordswereaddededitoriallyinOctober1997.1.Scope1.1Thesetestmethodscoverthedeterminationofthecompactiondensityofelectricalgrademagnesiumoxideinheatingunits.1.2Twoalternativeproceduresaredescribed:TestMethodA—WaterDisplacement,andTestMethodB—Absorption.1.3Thisstandarddoesnotpurporttoaddressthesafetyproblemsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.2.ReferencedDocuments2.1ASTMStandards:D176TestMethodsforSolidFillingandTreatingCom-poundsUsedforElectricalInsulation23.Apparatus3.1Foreithertestmethod,abalancecapableofweighingto0.1mgisrequired.4.Sampling4.1Specimensshallbeobtainedbycuttinglengthsofabout25mmfromtheheatingunit.4.2Roughedges,metalchips,orlooseoxideresultingfromthecuttingoperationshallberemovedcarefullybeforepro-ceeding.TESTMETHODA—WATERDISPLACEMENT5.Procedure5.1Weighthespecimentothenearest1mg.5.2Sealthespecimenagainstwaterabsorptionbytheuseofoneofthefollowingmaterials,thedensityofwhichmustbeknown:5.2.1Canadabalsam,moltenparaffinwax,RTVsiliconerubber,3orheat-shrinkablepoly(vinylchloride)tubing.4NOTE1—Thesealantmustcovereachfaceofthesampleandextendatleast5mmalongthesheathfromeachend.5.3Dry,cure,orotherwisefixthesealantaccordingtothestandardprocedureappropriatetothematerialused.5.4Weighthesealedspecimeninairtothenearest1mg.5.5Suspendthespecimenindistilledwaterandweighwhilesuspended.NOTE2—Caution:Usethesmallestandlightestsuspensionwirepos-sibletominimizeerror.5.6Stripthesealsfromthes...
