Designation:D4243−16StandardTestMethodforMeasurementofAverageViscometricDegreeofPolymerizationofNewandAgedElectricalPapersandBoards1ThisstandardisissuedunderthefixeddesignationD4243;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesastandardprocedurefordeterminingtheaverageviscometricdegreeofpolymerization(abbreviatedDP¯v)ofneworagedelectricalpapers.Thedeterminationismadebymeasuringtheintrinsicviscosityofasolutionofthepaperinanappropriatesolvent.1.2Thedegreeofpolymerization(orthedegreeofconden-sation)ofaparticularcellulosemoleculeisthenumberofanhydro-β-glucosemonomers,C6H10O5,inthecellulosemol-ecule.Withinasampleofpaper,notallthecellulosemoleculeshavethesamedegreeofpolymerizationsothatthemeanvaluemeasuredbyviscometricmethodsisnotnecessarilythesameasthatwhichareobtainedbyothermethods.1.3Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.SeeSection92.ReferencedDocuments2.1ASTMStandards:2D445TestMethodforKinematicViscosityofTransparentandOpaqueLiquids(andCalculationofDynamicViscos-ity)D1711TerminologyRelatingtoElectricalInsulation2.2OtherDocument:IEC60450MeasurementoftheAverageViscometricDegreeofPolymerizationofNewandAgedElectricalPapers33.Terminology3.1Definitions—Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD1711.4.SummaryofTestMethod4.1Thistestmethodmeasuresthespecificviscosityofasolutionofthepaperincupriethylene–diamine.Fromthismeasurementtheintrinsicviscosityofthesolutionisdeduced,andfromthisthedegreeofpolymerizationiseasilycalculated.4.2Thistestmethodfollow...
