Designation:E1945−02(Reapproved2016)StandardTestMethodforPercentDispersibility1ThisstandardisissuedunderthefixeddesignationE1945;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisusedtodeterminethepercentdispersibilityofdrypesticideformulations.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.ForspecificprecautionarystatementsseeSection7.2.ReferencedDocuments2.1ASTMStandards:2D1126TestMethodforHardnessinWaterD1193SpecificationforReagentWater3.SummaryofTestMethod3.1Aknownamountofdrypesticideformulationisaddedtoa250-mLmixingcylinderthathasbeenfilledtovolumewithstandardwater.Themixingcylinderisthenstopperedandinverted30timesin2min.Themixingcylinderisallowedtostandfor1min.After1min,thetop225mLisdrawnoffandtheremainingsuspensionisdried.Theresidueweightwilldeterminepercentdispersibility.4.SignificanceandUse4.1Thistestmethodisdesignedspecificallyfordryformu-lations.4.2Thistestmethodmaynotbeapplicabletoalldryformulationssuchasthosecontainingeitherliquidtechnicalsoringredientsthatrisetothetopuponseparation.4.3Thistestmethodmaynotbeapplicabletothosetech-nicalsthatdecomposebelowthedryingtemperature.4.4Thistestmethodshouldberuninduplicate.4.5Productscontainingwatersolubleorvolatilecompo-nentsmayresultinerrors.5.Apparatus5.1Balance,toploading,withanaccuracyof60.01gorbetter.5.2GravityOven.5.3WeighingDish,150mLcapacityorgreater.5.4VacuumApparatus,seeFig.1,equippedwithaventedstopper.5.5MixingCylinder,stoppered,250-mL,flatbottom.5.6Timer,adjustable,withanaccu...
