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1、Designation:D1212?91(Reapproved2013)StardTestMethodsfMeasurementofWetFilmThicknessofganicCoatings1ThisstardisissuedunderthefixeddesignationD1212thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioni

2、nthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thesetestmethodscoverthedeterminationofwetfilmt

3、hicknessofganiccoatingssuchaspaintvarnishlacquer.Twomethodsaredescribedasfollows:1.1.1InTestMethodAtheWetFilmThicknessGage(EnglishMetricgraduation(see5.1))isusedtomeasurewetfilmthicknessesupto60milsontheEnglishscaleserie

4、supto700monthemetricscaleseries(Sections5–8).1.1.2InTestMethodBthePfundGageisusedtomeasurewetfilmthicknessesupto14.2mils(360m)(Sections9–13).1.2ThevaluesstatedinSIunitsaretoberegardedasthestard.Thevaluesgiveninparenthese

5、sarefinfmationonly.1.3Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatyl

6、imitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D823PracticesfProducingFilmsofUnifmThicknessofPaintVarnishRelatedProductsonTestPanels3.SummaryofTestMethods3.1Thematerialisappliedinthelabatytoplanerigidtestpanelsin

7、thefieldtothesurfacebeingcoated.Thewetfilmthicknessisdeterminedasquicklyaspossibletoreduceshrinkageduetosolventloss.3.2InTestMethodAagagewithoneeccentrictwoconcentricwheelsisrolledoverthesurfacethepointwheretheeccentricw

8、heelfirsttouchesthewetfilmisdetermined.3.3InTestMethodBagagewithaconvexlowersurfaceispushedintothewetfilmuntilthecentertouchesthesubstrate.Thediameterofthespotofwetcoatingleftontheconvexsurfaceismeasuredthefilmthicknessc

9、alculatedfromthediameterofthespottheradiusofcurvature.4.SignificanceUse4.1Wetfilmthicknessmeasurementsaidinthepredictionofdryfilmthickness.Ininstanceswheredryfilmthicknesscannotbemeasurednondestructivelywetfilmthicknessi

10、sfrequentlyspecified.Alsotheabilitytodeterminewetfilmthicknessduringapplicationcanprovidetheopptunitytocrecttheapplicationprocedures.TESTMETHODA5.Apparatus5.1WetFilmThicknessGage—Twoversionsofthegagearenowinuse:3Theigina

11、ldesignasshowninFig.1alaterdesignasshowninFig.2.Bothdesignsconsistsofaneccentriccenterwheelsupptedbytwoconcentricwheelssoastoprovidetwoscalesthatarebilaterallysymmetrical.Asthegageisrolledonthefilmthereisachangeinclearan

12、cebetweenthewetfilmtheeccentricwheel.Thepointatwhichthefilmfirsttouchesthecenterwheelmeasuresthethicknessofthefilm.5.2ThelaterdesignshowninFig.2movestheeccentricwheelfrombetweentheconcentricwheelsasshowninFig.1totheoutsi

13、deofthegageclosertooneoftheconcentricwheels.Gagereadingerrsofparallaxacrossthegageareeliminatedasthetwoscalesareplaceddirectlyontheeccentricwheelerrswhenmeasuringonunevensupptsurfacesarereducedbyplacingtheeccentricwheelc

14、losertooneofthesupptingconcentricwheels.5.3Bestprecisionisobtainedwhenusingthenearlinearcentralptionofeachscaleconstitutingabout80%ofits1ThesetestmethodsareunderthejurisdictionofASTMCommitteeD01onPaintRelatedCoatingsMate

15、rialsApplicationsarethedirectresponsibilityofSubcommitteeD01.23onPhysicalPropertiesofAppliedPaintFilms.CurrenteditionapprovedJuly12013.PublishedJuly2013.iginallyapprovedin1952.Lastpreviouseditionapprovedin2007asD1212–91(

16、2007)ε1.DOI:10.1520D121291R13.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3Bothversionsofthis

17、gage(Interchemical(INMONT)Model“C”)arecoveredbyU.S.Patents25075923128558areissuedtoMaynardR.Euverard.InterestedpartiesareinvitedtosubmitinfmationregardingtheidentificationofacceptablealternativestothispatenteditemtotheCo

18、mmitteeonStardsASTMHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommitteewhichyoumayattend.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.Uni

19、tedStates17.Rept7.1Reptthemeanoftheseparatereadingstherangesmallestgraduationofthegageused.8.Precision48.1Inaninterlabatystudyofthistestmethodinwhichtwooperatsinatleastsixlabatiesmademeasurementswiththe0to20to4milgageson

20、threematerialsappliedattwofilmthicknessesthepooledwithinlabatystarddeviationwasfoundtobe0.12milswith34dfthebetweenlabatiesstarddeviation0.18ftwodeterminations0.17ffourdeterminationswith25df.Basedonthesestarddeviationsthe

21、followingcriteriashouldbeusedfjudgingtheacceptabilityofresultsatthe95%confidencelevel:8.1.1Repeatability—Resultseachthemeanofoppositerollsofthe0to20to4milgageobtainedbythesameoperatshouldbeconsideredsuspectiftheydifferby

22、methan0.4milftwodeterminations0.5milffourdeterminations.8.1.2Reproducibility—Tworesultseachthemeanoftwoseparatedeterminationsobtainedbyoperatsindifferentlabatiesshouldbeconsideredsuspectiftheydifferbymethan0.55mil.8.2The

23、precisionofhigherrangegagesisexpectedtobeproptionaltofilmthickness.TESTMETHODB9.Apparatus9.1PfundGage—Thegage5showninFig.3consistsofaconvexlensLwithlowersurfacehavingaradiusofcurvatureof250mmmountedinashttubeT1thatslides

24、freelyinanoutertubeT2.ThecompressionspringsSkeeptheconvexsurfaceoutofcontactwiththewetfilmuntilpressureisappliedtothetopofT1fcingthelensLdownthroughthefilm.ThedisplacedmaterialfmsanoversizedcircularspotofdiameterDontheco

25、nvexlens(largerthanthediameterDcrespondingtothethicknessTofthefilm)becauseofthemeniscuseffectduetowettingsurfacetensioneffectsontheglasslens.9.2SteelScale(furnishedwithPfundGage)calibratedinmillimetres.10.Procedure10.1Ap

26、plythematerialtosuitableplanerigidpanelsofareasufficientlylargetopermitfilmthicknessmeasurementsatleast25mm(1in.)fromanyedge.Determinethefilmthicknessimmediatelyafterapplication.10.2Supptthetestpanelsonasuitableflatlevel

27、baseinsuchawaythattherewillbenomovementspringofthepanelsduringthefilmthicknessmeasurements.AsshownintheseconddiagraminFig.3placethegageonthecoatedsurfaceslowlyfcetheinnertubedownasfarasitwillgo(pointFonsurfaceABofthebase

28、)allowingdisplacedmaterialtoescapethroughthenotchesintheoutertubebutpreventinglateralmotionofthegage.Uponreleasingthepressureanoversizedcircularspotisretainedonthelens.ItsdiameterDisthelengthofthelineEGcrespondstothesumo

29、ftwothicknesses:AK=BC=thicknessofunderlyingundisturbedcoating:KE=CG=thicknessofoverlyingdisplacedcoating.10.3Removethegagefromthesurfacemeasuretothenearest0.5mmintwodirectionsatapproximaterightanglesthediameteroftheovers

30、izespotonthelensusingthesteelscaledeterminethemeanofthetwomeasurementsthatisconsideredasonereading.Makeatleasttwoseparateteststoobtainthegrmeanfilmthickness.10.4Althoughthisprocedurereferstomeasurementsonflattestpanelsth

31、esametechniquemaybeusedinthefieldshoponcommercialarticlesprovidedthesubstrateisnotdisttedatthepointofcontacttoanextentthatwouldaffectthemeasurements.4SupptingdatahavebeenfiledatASTMInternationalHeadquartersmaybeobtainedb

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