Designation:D6619−00(Reapproved2016)StandardPracticeforIncorporatingPigmentsbyHighSpeedDispersion1ThisstandardisissuedunderthefixeddesignationD6619;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversthedispersionofpigmentsusingalaboratorysizehigh-speedimpellermill.ItissimilarintechnicalcontenttoISO8780-3.NOTE1—Thispracticeisrestrictedtomillbasesofmoderatelyhighviscosityduetoeitherhighvehicleconcentrationorhighpigmentconcentration,orboth,whichcanproducehighshearforce.Itisnotintendedtoprovideameansofformulatingeitherpilotplantorfull-scalemillbasecompositions(scalinguptheprocessfromlaboratoryequipmenttofactorymillsisnotsimple).1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ISOStandards:ISO8780-3PigmentsandExtenders—MethodsofDisper-sionforAssessmentofDispersionCharacteristics—DispersionUsingaHighSpeedImpellerMill23.SignificanceandUse3.1Highspeeddispersionisacommonlyuseddispersionmethodinthecoatingsindustry.Forthepurposeofthispractice,“highspeed”wouldnormallybeunderstoodtobearangeofRPMbetween3000and10000.Thispracticeprovidesareferenceforitsuse,sothataproducerandusercanstandardizeonanincorporationtechnique.Thiswillminimizedifferencesinthemillbase,andallowtheinterestedpartiestoconcentrateonthephysical,chemical,oropticalmethodstoberun.4.Apparatus4.1High-speedImpellerMill,consistingofacylindricalvesselandahorizontaldiskstirrerbladedrivenbyamotor.Adiskwithaserratededgeiscommonlyused.4.1.1DriveUnit—Thepowerratingofthedriveunitshallbesufficienttomaintaintheperipheralspeedofthediskatanagreedvalue.Areducedrotationalspeedshall...
