Designation:D2270−10´1BritishStandard4459Designation:226/91(95)StandardPracticeforCalculatingViscosityIndexfromKinematicViscosityat40and100°C1ThisstandardisissuedunderthefixeddesignationD2270;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.ε1NOTE—Correctedequationreferencesin5.2.4.2editoriallyinMarch2011.1.Scope*1.1Thispractice2coverstheproceduresforcalculatingtheviscosityindexofpetroleumproducts,suchaslubricatingoils,andrelatedmaterialsfromtheirkinematicviscositiesat40and100°C.NOTE1—TheresultsobtainedfromthecalculationofVIfromkine-maticviscositiesdeterminedat40and100°CarevirtuallythesameasthoseobtainedfromtheformerVIsystemusingkinematicviscositiesdeterminedat37.78and98.89°C.1.2Thispracticedoesnotapplytopetroleumproductswithkinematicviscositieslessthan2.0mm2/sat100°C.Table1giveninthispracticeappliestopetroleumproductswithkinematicviscositiesbetween2and70mm2/sat100°C.Equationsareprovidedforcalculatingviscosityindexforpetroleumproductshavingkinematicviscositiesabove70mm2/sat100°C.1.2.1Incaseswherekinematicviscositydataarenotavail-ableattemperaturesof40and100°C,anestimatemaybemadeoftheviscosityindexbycalculatingthekinematicviscosityattemperaturesof40and100°Cfromdataobtainedatothertemperatures.Suchviscosityindexdatamaybeconsideredassuitableforinformationonlyandnotforspecificationpur-poses.SeeTestMethodD341,AnnexA1.1.3Thekinematicviscosityvaluesaredeterminedwithreferencetoavalueof1.0034mm2/sat20.00°Cfordistilledwater.ThedeterminationofthekinematicviscosityofapetroleumproductshallbecarriedoutinaccordancewithTestMethodsD445,D7042,IP71,orISO3104.1.3.1IfViscosityIndexcalculatedforagivensampleusingkinematicviscositymeasurementsfromdifferenttestmethodsareindisagreement,thevaluescalcu...
