Designation:E2044−99(Reapproved2012)StandardTestMethodforSpreadingofLiquidAgriculturalSprayMixtures1ThisstandardisissuedunderthefixeddesignationE2044;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthevisualevaluationoftherelativespreadradiusofliquidspraymixturedroplets.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E1519TerminologyRelatingtoAgriculturalTankMixAd-juvants3.Terminology3.1Definitions:3.1.1adjuvant,n—amaterialaddedtoatankmixtoaidormodifytheactionofanagrochemical,orthephysicalcharac-teristicsofthemixture.(SeeTerminologyE1519.)3.1.2spreader,n—amaterialthatincreasestheareathatadropletofagivenvolumeofspraymixturewillcoveronatarget.(SeeTerminologyE1519.)3.1.3spreadradius,n—theradiusinmillimetresorsomeotherstandardizedunit,ofasubstratecoveredbyadroplet.4.SummaryofTestMethod4.1Thematerial(s)tobetestedismixedusingthedesiredconcentrationofeachcomponent.4.2A20-µLdropletofthespraymixtureisplacedcarefullyontoasubstrate.Underthissubstrateisagraphwithconcentricringsspacedat1-mmintervals.4.3After60s,thenumberofringsthatthedropletcovers,andthustheradiusofthedroplet,isobservedandrecorded.5.SignificanceandUse5.1Thistestmethodisintendedtoprovidearapidmeansofdeterminingtherelativeabilityofaliquidagriculturalspraymixturetospreadonatestsubstrate.5.2ThistestmethodwasvalidatedusingParafilmM3asatestsubstrate.Itistheuser’sresponsibilityfordeterminingthevalidityofthistestmethodforalternativetestsurfaces.W...
