Designation:D5670−95(Reapproved2014)StandardTestMethodforRubber—DeterminationofResidualUnsaturationinHydrogenatedNitrileRubber(HNBR)byInfraredSpectrophotometry1ThisstandardisissuedunderthefixeddesignationD5670;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthepercentageofresidualunsaturation(doublebondsinunhydrogenatedbutadiene)inhydrogenatednitrilerubberandisbasedoninfraredexamina-tionofrubberfilmscastfromsolution.1.2Thistestmethodisapplicabletoallgradesofhydroge-natednitrilerubberintherawstate.1.3Thistestmethodassumesthatspecimensandinfraredspectraarepreparedandanalyzedbyexperiencedpersonnelandthattheequipmentisoperatedaccordingtothemanufac-turer’sdirectionforoptimumperformance.Nodetailsforoperationofinfraredspectrophotometersareincludedinthistestmethod.1.4Sinceitiscustomaryininfraredspectrophotometrytousewavenumbers(cm−1)ratherthanHertz(Hz),theunitforfrequencyintheSIsystem,theformerisemployedthroughoutthistestmethod.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustriesE932PracticeforDescribingandMeasuringPerformanceofDispersiveInfraredSpectrometersE1421PracticeforDescribingandMeasuringPerformanceofFourierTransformMid-Infrared(FT-MIR)Spectrom-eters:LevelZeroandLevelOneTests3.SummaryofTestMethod3.1Aspecimenoftherawrubberispurifiedbyprecipitationwithmethanolfromasolutioninmethylethylketoneorbyex...
