Designation:D7539−10(Reapproved2015)StandardPracticeforUsingaTestChamberforHumidityConditioningofTestPanelsofPavementMarkingPaints1ThisstandardisissuedunderthefixeddesignationD7539;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1SpecificationD3924definesastandardenvironmentof2362°Cand5065%relativehumidityandfreefromdraftsfornormalconditioningandtestingofpaint,varnish,lacquer,andrelatedmaterials.Thispracticedescribesatestchamberthatallowsforcontrolofrelativehumidityabovetheambientrelativehumidityandminimizationofairflowforconditioningoftestpanelsatelevatedrelativehumidityandroomtempera-tures.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D711TestMethodforNo-Pick-UpTimeofTrafficPaintD1640TestMethodsforDrying,Curing,orFilmFormationofOrganicCoatingsD3924SpecificationforEnvironmentforConditioningandTestingPaint,Varnish,Lacquer,andRelatedMaterialsD7377PracticeforEvaluatingtheWaterWash-OffResis-tanceofTrafficPaintsusingaWaterFaucetD7538PracticeforEvaluatingtheWaterWash-OffResis-tanceofTrafficPaintsUsinganAtomizingSprayDevice2.2OtherStandard:3TT-P-1952EFederalSpecificationforPaint,TrafficandAirfieldMarking,Waterborne(10July2007)3.Terminology3.1Definitions:3.1.1testchamber,n—acabinetorbox,preferablymadeoftransparent,waterproofmaterial,suchasclearacrylicplastic,withpanelsupportsandholes(ports)thatcanbepartiallytofullyopenedtomixoutsideambientair...
