Designation:D2024−09(Reapproved2017)StandardTestMethodforCloudPointofNonionicSurfactants1ThisstandardisissuedunderthefixeddesignationD2024;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversaproceduretodeterminethe“cloudpoint”ofnonionicsurfactantsordetergentsystems.CloudPointisthetemperatureatwhichdissolvedcomponents(solidsorliquids)arenolongercompletelysoluble,precipatingasasecondphasegivingthefluidacloudyappearance.Itislimitedtothosesurfactantsanddetergentsystemsforwhichthevisiblesolubilitychangeoccursoverarangeof1°Corlessatconcentrationsof0.5to1.0%inDIwaterbetween30and95°C.1.2ChemicalLimitations—Nonionicsurfactantsthatexhibitacharacteristiccloudpointingeneraltermsconsistofawater-in-solublemoietycondensedwith50to75%byweightofethyleneoxide.Ifthelevelofethoxylationistoolowthesurfactantmaynotbewatersolubleattemperatureslessthan30°C,andifitistoohighnocloudpointmayexist.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2E1SpecificationforASTMLiquid-in-GlassThermometers3.SignificanceandUse3.1Thecloudpointtemperatureisareproduciblecharac-teristicofcertainpurenonionicsurfactants.Itisalsocharac-teristicofcertainnonionicsurfactantformulatedsystems.Thistestm...
