ASTM D6441-2005 测量粉末涂层遮盖能力的标准试验方法

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【英文标准名称】:StandardTestMethodsforMeasuringtheHidingPowerofPowderCoatings
【原文标准名称】:测量粉末涂层遮盖能力的标准试验方法
【标准号】:ASTMD6441-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【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】:D01.51
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:粉末覆层;对比度;不透明度;遮盖力;试验方法;测量
【英文主题词】:contrastratio;hidingpower;opacity;powdercoatings
【摘要】:Contrastratioataspecifiedfilmthicknessisausefulhidingpowerparameterforproductioncontrolandpurchasingspecifications.Thegreaterthehidingpower,thelesscoatingisrequiredperunitareatoobtainadequatehiding.Knowledgeofhidingpoweristhereforeimportantinregardtocoatingcostsandforcomparingcoatingvalue.1.1Thesetestmethodsdetermineandreportthehidingpowerofapowdercoatingwithrespecttotwoparameters:1.1.1TestMethodA-ContrastRatioatagivenfilmthickness1.1.2TestMethodB-Filmthicknessat0.98(98%)contrastratio.Note1-Themeasuredparametersconformtopowdercoatingindustrypracticebymeasuringhidingpowerinrelationtofilmthickness,ratherthanthemoreconventional"SpreadingRate"functionemployedinTestMethodsD344andD2805andotherhidingpowertestmethods.Note2-Hidingpowerisphotometricallydefinedasthespreadingrateat0.98contrastratio.SeedefinitionsofspreadingrateandhidingpowerinTerminologyD16,D2805,andthePaintandCoatingsTestingManual.Note3-Thecontrastratioof0.98isconventionallyacceptedinthecoatingsindustryasrepresenting"complete"hidingforreflectometrichidingpowermeasurements.Butvisually,aswellasphotometrically,itisslightlylessthancomplete.1.2Thesetestmethodscoverthedeterminationofthehidingpowerofpowdercoatingsappliedbyelectrostaticspraying.1.3Thesetestmethodsdeterminehidingpowerbymeansofreflectometricandthicknessgagemeasurements.TheyarelimitedtocoatingshavingaminimumCIE-Yreflectanceof15%.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A29
【国际标准分类号】:87_040
【页数】:8P.;A4
【正文语种】: