Designation:D2196−15StandardTestMethodsforRheologicalPropertiesofNon-NewtonianMaterialsbyRotationalViscometer1ThisstandardisissuedunderthefixeddesignationD2196;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscoverthedeterminationoftheapparentviscosityandtheshearthinningandthixotropicpropertiesofnon-Newtonianmaterialsintheshearraterangefrom0.1to50s−1usingarotationalviscometeroperatinginafluidof“infinite”dimensions.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.SummaryofTestMethod2.1TestMethodAconsistsofdeterminingtheapparentviscosityofcoatingsandrelatedmaterialsbymeasuringthetorqueonaspindlerotatingataconstantspeedinthematerial.2.2TestMethodsBandCconsistofdeterminingtheshearthinningandthixotropic(time-dependent)rheologicalproper-tiesofthematerials.2Theviscositiesofthesematerialsaredeterminedataseriesofprescribedspeedsofarotational-typeviscometeroperatinginafluidof“infinite”dimensions.Theagitationofthematerialimmediatelyprecedingtheviscositymeasurementsiscarefullycontrolled.3.SignificanceandUse3.1TestMethodAisusedfordeterminingtheapparentviscosityatagivenrotationalspeed,althoughviscositiesattwoormorespeedsgivebettercharacterizationofanon-Newtonianmaterialthandoesasingleviscositymeasurement.3.2WithTestMethodsBandC,theextentofshearthinningisindicatedbythedropinviscositywithincreasingrotationalspeed.Thedegreeofthixotropyisindicatedbycomparisonofviscositiesatincreasingandd...
