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【英文标准名称】:StandardTestMethodforTransparencyofPlasticSheeting
【原文标准名称】:塑料薄板透明度的标准试验方法
【标准号】:ASTMD1746-2003
【标准状态】:现行
【国别】:
【发布日期】:2003
【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】:D20.40
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:铁路;塑料;透明度;试验
【英文主题词】:clarity;plastic;regulartransmittance;sheeting;transmittance;transparency
【摘要】:Theattributeofclarityofasheet,measuredbyitsabilitytotransmitimage-forminglight,correlateswithitsregulartransmittance.Sensitivitytodifferencesimproveswithdecreasingincidentbeam-andreceptor-angle.Iftheangularwidthoftheincidentbeamandofthereceptoraperture(asseenfromthespecimenposition)areoftheorderof0.1x00B0;orless,sheetingofcommercialinteresthavearangeoftransparencyofabout10to90%asmeasuredbythistest.Resultsobtainedbytheuseofthistestmethodaregreatlyinfluencedbythedesignparametersoftheinstruments;forexample,theresolutionislargelydeterminedbytheangularwidthofthereceptoraperture.Cautionshouldthereforebeexercisedincomparingresultsobtainedfromdifferentinstruments,especiallyforsampleswithlowregulartransmittance.Regulartransmittancedatainaccordancewiththistestmethodcorrelatewiththepropertycommonlyknownasx201C;see-through,x201D;whichisratedsubjectivelybytheeffectofahand-heldspecimenonanobserver’abilitytodistinguishclearlyarelativelydistanttarget.Thiscorrelationispoorforhighlydiffusingmaterialsbecauseofinterferenceofscatteredlightinthevisualtest.1.1Thistestmethodcoversthemeasurementofthetransparencyofplasticsheetingintermsofregulartransmittance(Tr).Althoughgenerallyapplicabletoanytranslucentortransparentmaterial,itisprincipallyintendedforusewithnominallyclearandcolorlessthinsheeting.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThereisnosimilarorequivalentISOstandard.Note28212;Foradditionalinformation,seeTerminologyE284andPracticeE1164.
【中国标准分类号】:G33
【国际标准分类号】:
【页数】:4P.;A4
【正文语种】: