Designation:D4752−20StandardPracticeforMeasuringMEKResistanceofEthylSilicate(Inorganic)Zinc-RichPrimersbySolventRub1ThisstandardisissuedunderthefixeddesignationD4752;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThispracticedescribesasolventrubtechniqueforassessingtheMEKresistanceofethylsilicate(inorganic)zinc-richprimers.TheMEKresistanceofsometwo-componentethylsilicatezinc-richprimershasbeenshowntocorrelatewellwiththecureoftheprimerasdeterminedbydiffusereflectanceinfraredspectroscopy.2Thetechniquecanbeusedinthelaboratory,field,orinthefabricatingshop.PracticeD5402isthepreferredmethodfororganiccoatings.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.SpecifichazardstatementsaregiveninSection6.Consultsupplier’sSafetyDataSheet(s)forspecifichazardinformationrelatingtothesolventused.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3D740SpecificationforMethylEthylKetoneD4138PracticesforMeasurementofDryFilmThicknessofProtectiveCoatingSystemsbyDestructive,Cross-SectioningMeansD5402PracticeforAssessingtheSolventResistanceofOrganicCoatingsUsingSolventRubsD7091PracticeforNondestructiveMeasurementofDryFilmThicknessofNonmagneticCoatingsAppliedtoFerrousMetalsandNonmagnetic,Nonconduc...
