ANSI/NFPA 55-2003 便携式储气瓶中的压缩和液化气体

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标准名称：	塑料注射模零件 限位钉
中标分类：
替代情况：	被SJ/T 10519.27-94代替
发布日期：
实施日期：	2004-03-01
首发日期：
作废日期：
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页数：	1页

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【英文标准名称】:StandardPracticeforTestingWaterResistanceofCoatingsin100%RelativeHumidity
【原文标准名称】:在100%相对湿度条件下测定涂层耐水性能的标准实施规程
【标准号】:ASTMD2247-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:adhesion;blistering;humidity;resistance-water;rust;Adhesion--paints/relatedcoatings/materials;Blistering;Coatings(paint/relatedapplications);Exposuretests--organiccoatings;Exteriorcoatings;Industrialcoatings/applications;Interiorpaints
【摘要】:Watercancausethedegradationofcoatings,soknowledgeofhowacoatingresistswaterishelpfulforassessinghowitwillperforminactualservice.Failureintestsat100%relativehumiditymaybecausedbyanumberoffactorsincludingadeficiencyinthecoatingitself,contaminationofthesubstrate,orinadequatesurfacepreparation.Thispracticeisthereforeusefulforevaluatingcoatingsaloneorcompletecoatingsystems.Testsat100%relativehumidityareusedforspecificationacceptance,qualitycontrol,andresearchanddevelopmentforcoatingsandsubstratetreatments.Sometestsareusedforapassorfaildeterminationatanarbitrarytime.Acoatingsystemisconsideredtopassifthereisnoevidenceofwater-relatedfailureafteraperiodoftime.Othertestsareusedtomonitordegreeoffailureasafunctionofexposuretime.Arbitrarypass/faillevelsandthetestdurationsrequiredaretypicallysetinothermaterialspecifictestmethods.Usersofthispracticealonemayusetheknownperformanceofthecontrolstosettestendpoints.Anotheroptionistocontinuethetestuntilallspecimenshavefailed,andusethetimetoreachfailureasawaytodifferentiateperformance.Resultsobtainedfromtheuseof100%humiditytestsinaccordancewiththispracticeshouldnotberepresentedasbeingequivalenttoaperiodofexposuretowaterinthenaturalenvironment,untilthedegreeofquantitativecorrelationhasbeenestablishedforthecoatingorcoatingsystem.Thetestchambercanbeasmalllaboratorycabinetoraroomlargeenoughtoholdanautomobileoratruck.Someautomobilemanufacturerstestcompletedvehiclesinroomsmaintainedat100%relativehumidity.1.1Thispracticecoversthebasicprinciplesandoperatingproceduresfortestingwaterresistanceofcoatingsbyexposingcoatedspecimensinanatmospheremaintainedat100%relativehumiditysothatcondensationformsonthetestspecimens.1.2Thispracticeusesthetechniqueofcreatingaslighttemperaturedifferentialwithintheexposureareatoformcondensationonthecoatedspecimens.Asthewarmersaturatedairpassesthecoolerspecimens,waterisdepositedontothespecimensintheformofcondensation.1.3Thispracticeplacestheentirespecimenintheexposureareaallowingcondensationtoformonallsurfaces.Thismakesthispracticesuitableforflatpanelsaswellaslargeor3Dobjects.Thispracticediffersfromothermethodswherecondensationisonlyformedonthefrontcoatingsurface,butthebacksurfaceisoutsidetheexposurearea.Othertestsmayalsodepositwaterdropletsonthesurfacebutwherethesourceisnotfromcondensation.Note18212;AlternativepracticesfortestingthewaterresistanceofcoatingsincludePracticesD870,D1735,andD4585.1.4Thispracticeislimitedtothemethodsofobtaining,measuring,andcontrollingtheconditionsandproceduresoftestsconductedin100%relativehumidity.Itdoesnotspecifyspecimenpreparation,orevaluationofresults.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A29
【国际标准分类号】:87_040
【页数】:7P.;A4
【正文语种】:英语