【英文标准名称】:StandardTestMethodforOutdoorWeatheringExposureofCrosslinkedPolyethylene(PEX)Tubing
【原文标准名称】:交联聚乙烯(pex)管道户外风化的标准试验方法
【标准号】:ASTMF2657-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:F17.40
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:交联;风化;交联聚乙烯;管路;管;塑料管;聚乙烯;测试;管道
【英文主题词】:crosslinkedpolyethylene;PEX;sunlight;tubing;UVexposure;weathering
【摘要】:Duringshipment,storageandinstallation,PEXtubingmaybeexposedtoUVradiationpriortobeingshieldedfromfurtherexposureafterinstallation.TheeffectsofUVexposureonPEXtubingisdeterminedbyuseofthistestmethod.ByfirstexposingspecimenstosolarUVradiationandsubsequentlytestingspecimensforoxidativeresistanceorstabilizerfunctionality,changesasaresultofsolarUVradiationexposurecanbeevaluated.ThisinformationcanbeusedtodeterminethemaximumallowabletotalUVexposurepriortopermanentshieldingprovidedbyinstallation.nbsp;nbsp;nbsp;Theresultsofshort-termexposuretestscanprovideanindicationofrelativeoutdoorperformance,buttheyshouldnotbeusedtopredicttheabsolutelong-termperformanceofamaterial.Theresultsoftestsconductedforlessthantwelvemonthswilldependontheparticularseasonoftheyearinwhichtheybegin.1.1Thistestmethoddescribestheprocedureforexposingcrosslinkedpolyethylene(PEX)tubingproducedinaccordancewithSpecificationF876tonatural(sunlight)ultraviolet(UV)radiationandevaluatingtheeffectsoftheexposure.Thistestmethodoutlinestherequirementsforspecimensizeandpreparation,exposureorientation,minimumUVexposureenergy,postexposuretestingandreporting.Note18212;WhileotherlaboratoryUVexposuresystemsareavailable,thistestmethodreliesonnaturalsunlightastheUVradiationsource.Laboratorymethodsmaybeaddedinthefutureiftestingconfirmsacorrelationbetweennaturalsunlightandlaboratoryexposure.1.2PEXtubingisnotdesignedforoutdooruse.Datafromshort-termexposuretestingperthistestmethodcanbeusedtojudgetherelativeperformanceofPEXtubingstoredoutdoorsforshortperiodsoftimepriortoinstallationcompletelyshieldedfromsunlight.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thefollowingprecautionarycaveatpertainsonlytothetestmethodandpostexposuretestingportions,Sections8and9ofthistestmethod.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G33
【国际标准分类号】:23_040_20
【页数】:5P.;A4
【正文语种】: