Designation:D1640/D1640M−14StandardTestMethodsforDrying,Curing,orFilmFormationofOrganicCoatings1ThisstandardisissuedunderthefixeddesignationD1640/D1640M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscoverthedeterminationofthevariousstagesandratesoffilmformationinthedryingorcuringoforganiccoatingsunderlaboratorycontrolledcondi-tionsofairtemperature,(low,ambientand/orelevated)and/orhumidity.Proceduresforassessingdryingunderprevailingconditionsoftemperatureandhumidityintheshopandfieldarealsodescribed.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D823PracticesforProducingFilmsofUniformThicknessofPaint,Varnish,andRelatedProductsonTestPanelsD4414PracticeforMeasurementofWetFilmThicknessbyNotchGages2.2ISOStandards:ISO9117–4Paintsandvarnishes—Determinationofdrying—Part4:Methodusingamechanicalrecorder3.SignificanceandUse3.1Thesetestmethodscanbeusedtodeterminethevariousstagesandratesofdrying,curing,andfilmformationoforganiccoatingsforcomparingtypesofcoatings,assessingtheimpactofcompositionalchangesondryingtime,orforassessingdrying/curingtimeintheshoporfield.Lowtem-peraturecansignificantlyslowthedryingrateofcoatingssolowtemperaturecuringagents,catalystsand/oracceleratorsareof...
