Designation:D1807−00(Reapproved2005)´1StandardTestMethodsforRefractiveIndexandSpecificOpticalDispersionofElectricalInsulatingLiquids1ThisstandardisissuedunderthefixeddesignationD1807;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.´1NOTE—Theword“containment”wascorrectedto“contaminant”inthesecondsentenceof4.1editoriallyinDecember2009.1.Scope1.1Thesetestmethodscoverthedeterminationoftherefractiveindexandthespecificopticaldispersionofelectricalinsulatingliquidssuchasareusedincapacitors,transformers,circuitbreakers,andoil-filledcables.1.2Twotestmethodsaredescribed,aroutinemethodandamorepreciserefereemethod.Bothmethodsareapplicabletotransparent,light-colored,insulatingliquids.1.2.1Theroutinemethodisusedtodeterminerefractiveindexandspecificopticaldispersionasdescribedinthesetestmethods.1.2.2Therefereemethodisusedwhenatestofhighaccuracyisdesired.ThesemethodsaredescribedinTestMethodD1218.SpecificopticaldispersioniscalculatedbydividingtherefractivedispersionvaluedeterminedinTestMethodD1218bytherelativedensity(specificgravity)(seeTestMethodD1298)oftheliquidundertest.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1218TestMethodforRefractiveIndexandRefractiveDispersionofHydrocarbonLiquidsD1298TestMethodforDensity,RelativeDensity(SpecificGravity),orAPIGravityofCrudePetroleumandLiquidPetroleumProductsbyHydrometerMethod3.Terminology3.1Definitions:3.1.1refractiveindex,n—theratioofthevelocityoflightinairtoitsvelocityinthesubstanceund...
