Designation:D7836−13(Reapproved2020)StandardTestMethodsforMeasurementofYieldStressofPaints,InksandRelatedLiquidMaterials1ThisstandardisissuedunderthefixeddesignationD7836;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthreeapproachesfordetermin-ingyieldstressvaluesofpaints,inksandrelatedliquidmaterialsusingrotationalviscometers.Thefirstmethodusesarotationalviscometerwithcoaxialcylinder,cone/plate,orplate/plategeometry.Thesecondmethodusesarheometeroperatingincontrolledstressmodewithsimilargeometries.Thethirdmethodusesaviscometerwithavanespindle.1.2Anon-rotationaltechnique,thefallingneedleviscom-eter(FNV),alsocanbeusedtomeasureyieldstressvaluesinpaints,inksandrelatedmaterials.SeeTestMethodsD5478,TestMethodD,YieldStressDeterminationfordetails.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3925PracticeforSamplingLiquidPaintsandRelatedPigmentedCoatingsD5478TestMethodsforViscosityofMaterialsbyaFallingNeedleViscometer3.Terminology3.1vanespindle,n—spindleinwhichseveral(4to6)rectangularvanesareattachedtotheshaftgivingtheappear-anceofacrossorstarwhenviewedfromtheend.3.1.1Discussion—Avanespindlecanbeimmersedinaspecimenwithoutdestroyingtheshear-sensitivestructure.3.2yieldstress,n—thecriticalstressatwhichamater...
