NF E29-572-1969 四分之一转的连接件(吉耶曼系统).公称压力pn16

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【英文标准名称】:StandardPracticeforOutdoorWeatheringofPlastics
【原文标准名称】:塑料的室外风化的标准操作规程
【标准号】:ASTMD1435-2005
【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】:D20.50
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:塑料;风化;试验
【英文主题词】:exposure;naturalweathering;outdoorweathering;plastics
【摘要】:Testsconductedinaccordancewiththispracticeareusedtoevaluatethestabilityofplasticmaterialswhentheyareexposedoutdoors.Therelativedurabilityofplasticsinoutdoorusecanbeverydifferentdependingonthelocationoftheexposurebecauseofdifferencesinultraviolet(UV)radiation,timeofwetness,temperature,pollutants,andotherfactors.Itcannotbeassumed,therefore,thatresultsfromoneexposureinasinglelocationwillbeusefulfordeterminingrelativedurabilityinadifferentlocation.Exposuresinseverallocationswithdifferentclimatesthatrepresentabroadrangeofanticipatedserviceconditionsarerecommended.4.1.1Becauseofyear-to-yearclimatologicalvariations,resultsfromasingleexposuretestcannotbeusedtopredicttheabsoluterateatwhichamaterialdegrades.Severalyearsofrepeatexposuresareneededtogetanaveragetestresultforagivenlocation.Theresultsofshort-termexposuretestscanprovideanindicationofrelativeoutdoorperformance,buttheyshouldnotbeusedtopredicttheabsolutelong-termperformanceofamaterial.Theresultsoftestsconductedforlessthantwelvemonthswilldependontheparticularseasonoftheyearinwhichtheybegin.1.1Thispracticeisintendedtocoverproceduresfortheexposureofplasticmaterialstoweather.Note1SeePracticeG24foragingunderglass.1.2Thispracticeislimitedtothemethodbywhichthematerialistobeexposedandthegeneralproceduretobefollowed.Itisintendedforusewithfinishedarticlesofcommerceaswellaswithallsizesandshapesoftestspecimens.1.3Meansofevaluationoftheeffectsofweatheringwilldependontheintendeduseforthetestmaterial.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.ThisstandardandISO877.2-1991,MethodA,aretechnicallyequivalent.
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:5P.;A4
【正文语种】:

标准名称：	滚动轴承包装木箱技术条件
中标分类：	机械 >> 通用零部件 >> 滚动轴承
替代情况：	被JB/T 3016-91代替
发布日期：
实施日期：	1995-01-01
首发日期：
作废日期：
出版日期：

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