Designation:D7867−13StandardTestMethodsforMeasurementoftheRotationalViscosityofPaints,InksandRelatedLiquidMaterialsasaFunctionofTemperature1ThisstandardisissuedunderthefixeddesignationD7867;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscovertheuseofrotationalviscom-eterstodeterminethedependenceofapparentviscosityofpaints,inksandrelatedliquidmaterialsontemperature.Thefirstmethodusesastandardrotationalviscometerwithcon-centriccylindergeometryrunningatafixedrotationalspeedasthetemperatureisincreasedordecreased.Thesecondmethodusesarotationalviscometerwithconeandplategeometryrunningatafixedrotationalspeedasthetemperatureisincreasedordecreased.Thethirdmethodusesconcentriccylinderorcone/plategeometryoperatedwithashearraterampatseveraldiscretetemperatures.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandardmayinvolvehazardousmaterials,opera-tionsandequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D3925PracticeforSamplingLiquidPaintsandRelatedPigmentedCoatings3.Terminology3.1Definitions:3.1.1apparentviscosity,n—viscositythatisnotatruepropertyofthefluid,butavariabledependingontheshearrate.3.1.2shearthinningfluid—fluidinwhichtheapparentviscositydecreaseswithincreasingshearrate.3.1.3thixotropicfluid,n—fluidwhoseviscosityistimedependent,thatis,itsviscositydecreaseswiththetimeitissubjectedtoshear.3.1.4viscosity,n—theratiobetweenanappliedshearstresstotheresultingshearrate(velocitygradient)isdefinedasthedynamicviscosity;itisameasureoftheresist...
