【英文标准名称】:StandardPracticeforMeasurementofWetFilmThicknessbyNotchGages
【原文标准名称】:刻痕量规测定湿膜厚度的标准实施规程
【标准号】:ASTMD4414-1995(2007)
【标准状态】:现行
【国别】:
【发布日期】:1995
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D01.23
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:覆层;厚度测量;厚度;测量;涂漆;涂料;工艺
【英文主题词】:circularnotchedgage;rectangularnotchedgage
【摘要】:Wetfilmthicknessmeasurementsofcoatingsappliedonarticlescanbeveryhelpfulincontrollingthethicknessofthefinaldrycoating,althoughinsomespecificationsthewetfilmthicknessisspecified.Mostprotectiveandhighperformancecoatingsareappliedtomeetarequirementorspecificationfordryfilmthicknessforeachcoatorforthecompletedcoatingsystem,orforboth.Thereisadirectrelationshipbetweendryfilmthicknessandwetfilmthickness.Thewetfilm/dryfilmratioisdeterminedbythevolumeofvolatilesinthecoatingasapplied,includingpermittedthinning.Withsomeflatcoatingsthedryfilmthicknessishigherthanthatcalculatedfromthewetfilmthickness.Consequently,theresultsfromthenotchgagearenottobeusedtoverifythenonvolatilecontentofacoating.Measurementofwetfilmthicknessatthetimeofapplicationismostappropriateasitpermitscorrectionandadjustmentofthefilmbytheapplicatoratthetimeofapplication.Correctionofthefilmafterithasdriedorchemicallycuredrequirescostlyextralabortime,mayleadtocontaminationofthefilm,andmayintroduceproblemsofadhesionandintegrityofthecoatingsystem.TheproceduresusingnotchedgagesdonotprovideasaccurateorsensitivemeasurementsofwetfilmthicknessasdotheInterchemicalandPfundgagesdescribedinTestMethodsD1212.Notchgagesmay,however,beusedonnonuniformsurfaces,likeconcreteblock,thataretooroughtousetheInterchemicalandPfundgages.Alsonotchedgagescanbeveryusefulintheshopandfieldfordeterminingtheapproximatethicknessofwetfilmsovercommercialarticleswheresize(s)andshape(s)arenotsuitableformeasurementsbyothertypesofgages.Examplesofsuchitemsareellipses,thinedges,andcorners.Anoperatorexperiencedintheuseofanotchedgagecanmonitorthecoatingapplicationwellenoughtoensuretheminimumrequiredfilmthicknesswillbeobtained.Applicationlosses,suchasoverspray,lossontransfer,andcoatingresidueinapplicationequipment,areasignificantunmeasurablepartofthecoatingusedonajobandarenotaccountedforbymeasurementofwetfilmthickness.1.1Thispracticedescribestheuseofthinrigidmetalnotchedgages,alsocalledsteporcombgages,inthemeasurementofwetfilmthicknessoforganiccoatings,suchaspaint,varnish,andlacquer.1.2Notchedgagemeasurementsareneitheraccuratenorsensitive,buttheyareusefulindeterminingapproximatewetfilmthicknessofcoatingsonarticleswheresize(s)andshape(s)prohibittheuseofthemoreprecisemethodsgiveninTestMethodsD1212.1.3Thispracticeisdividedintothefollowingtwoprocedures:1.3.1ProcedureA-Asquareorrectangularrigidmetalgagewithnotchedsidesisusedtomeasurewetfilmthicknessesrangingfrom3to2000m(0.5to80mils1).Suchagageisapplicabletocoatingsonflatsubstratesandtocoatingsonarticlesofvarioussizesandcomplexshapeswhereitispossibletogettheendtabsofthegagetorestinthesameplaneonthesubstrate.1.3.2ProcedureB-Acircularthinrigidmetalnotchedgageisusedtomeasurewetfilmthicknessesrangingfrom25to2500m(1to100mils).Suchagageisapplicabletocoatingsonflatsubstratesandtocoatingsonobjectsofvarioussizesandcomplexshapes.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitations......
【中国标准分类号】:A29;G50
【国际标准分类号】:87_040
【页数】:3P.;A4
【正文语种】: