Designation:D1092−20StandardTestMethodforMeasuringApparentViscosityofLubricatingGreases1ThisstandardisissuedunderthefixeddesignationD1092;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversmeasurement,inpoises,oftheapparentviscosityoflubricatinggreasesinthetemperaturerangefrom−54°Cto38°C(−65°Fto100°F).Measurementsarelimitedtotherangefrom25Pto100000Pat0.1s−1and1Pto100Pat15000s−1.NOTE1—Atverylowtemperaturestheshearraterangemaybereducedbecauseofthegreatforcerequiredtoforcegreasethroughthesmallercapillaries.Precisionhasnotbeenestablishedbelow10s−1.1.2Thisstandardusesinch-poundunitsaswellasSI(acceptablemetric)units.Thevaluesstatedfirstaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.ThecapillarydimensionsinSIunitsinFig.A1.1andFig.A1.2arestandard.1.3Thistestmethodusesmercurythermometers.WARNING—Mercuryhasbeendesignatedbymanyregula-toryagenciesasahazardoussubstancethatcancauseseriousmedicalissues.Mercury,oritsvapor,hasbeendemonstratedtobehazardoustohealthandcorrosivetomaterials.Usecautionwhenhandlingmercuryandmercury-containingproducts.SeetheapplicableproductSafetyDataSheet(SDS)foradditionalinformation.Thepotentialexiststhatsellingmercuryormercury-containingproducts,orboth,isprohibitedbylocalornationallaw.Usersmustdeterminelegalityofsalesintheirlocation.Theresponsiblesubcommittee,D02.G0,continuestoexplorealternativestoeventuallyreplacethemercuryther-mometers.1.3.1Inaddition,temperaturemeasuringdevicessuchasliquid-in-glassthermometers(SpecificationsE1andE2251),thermocouples,thermistors,orplatinumresistancethermom-etersthatprovideequivalentorbetteraccuracyandprecision,thatcoverthetemperaturerangeforASTMthermometer49C,maybeused.1.4T...
