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【英文标准名称】:StandardPracticeforPerformingAcceleratedOutdoorWeatheringofFactory-CoatedEmbossedHardboardUsingConcentratedNaturalSunlightandaSoak-Freeze-ThawProcedure
【原文标准名称】:用集中自然光和浸水-冻结-解冻程序进行工厂涂覆压花纤维板室外加速风化的标准实施规程
【标准号】:ASTMD5722-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D01.27
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:acceleratedweathering;factorycoatings(hardboard);filmintegrity;hardboard(compositionboardsiding);Acceleratedaging/testing--paints/relatedcoatings;Film--paints/relatedcoatings/materials;Factory-appliedcoatings;Filmintegrity;Hardboard;O
【摘要】:Theabilitytoquicklyandaccuratelyevaluateandpredictlong-termweatheringperformanceoffactory-appliedcoatingsisofparamountimportanceinmakingsoundbusinessandtechnicaldecisions.Itisimportanttoincludecontrolspecimensofknownfieldperformancetodeterminetheefficacyofthispracticeforspecificsubstrate(s)andcoatingsystem(s).Thesecontrolspecimensmayincludematerialsknowntopossessacceptableandunacceptablefieldperformanceforthedefect(s)underconsideration.Resultsderivedfromthispracticearebestusedtocomparetherelativeperformanceofmaterialstestedatthesametimeinthesamedevice.Theinclusionofcontrolspecimensandtheirresultingdatawillassistindealingwithtestvariabilitycausedbyseasonalorannualvariationsinimportantclimaticfactors.Extensiveresearchwasperformedduringthedevelopmentofthisstandardpractice.Thisresearchshowedthatthispracticeisnotusefulfordeterminationofquantitativeaccelerationfactors.However,thistestisveryusefulasacomparativetest.Aminimumoftworeplicatesforbothcontrolspecimensandtestspecimensisrecommendedtoallowstatisticalevaluationofresults.RefertoPracticeG169foradditionalguidanceonestablishingthenumberofreplicates.1.1Thispracticecoverstechniquestoaccelerateweatheringeffectsoffactory-coatedembossedhardboardusingCycle1ofPracticeG90(concentratednaturalsunlightwithperiodicsurfacewaterspray)plusasoak-freezethawcycle(seeSection5ofthispractice).1.2Testingbyuseofthemethodsdescribedinthispracticemaybeemployedinthequalitativeassessmentofweatheringeffects.Therelativedurabilityofcoatedhardboardsmaybebestdeterminedbycomparisonoftheirtestresultswiththoseofcontrolspecimensderivedfromrealtimeexposuretestexperience.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:B70
【国际标准分类号】:
【页数】:3P.;A4
【正文语种】:英语