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1、Designation:D570–98(Reapproved2005)StandardTestMethodfor1WaterAbsorptionofPlasticsThisstandardisissuedunderthefixeddesignationD570;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberi
2、nparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope3.2Comparisonofwaterabsorptionvaluesofvariousplas-1.1Thistestmethodcoversthedeterminationoftherelativeticscanbemadeonthebasisof
3、valuesobtainedinaccordancerateofabsorptionofwaterbyplasticswhenimmersed.Thiswith7.1and7.4.3.3Idealdiffusionofliquids4intopolymersisafunctionoftestmethodisintendedtoapplytothetestingofalltypesofplastics,includingcast,hot-molded,andcold-moldedresinousthesquarero
4、otofimmersiontime.Timetosaturationisproducts,andbothhomogeneousandlaminatedplasticsinrodstronglydependentonspecimenthickness.Forexample,Tableandtubeformandinsheets0.13mm[0.005in.]orgreaterin1showsthetimetoapproximatetimesaturationforvariousthickness.thicknesso
5、fnylon-6.1.2ThevaluesgiveninSIunitsaretoberegardedas3.4Themoisturecontentofaplasticisveryintimatelystandard.Thevaluesstatedinbracketsareforinformationrelatedtosuchpropertiesaselectricalinsulationresistance,only.dielectriclosses,mechanicalstrength,appearance,an
6、ddimen-1.3Thisstandarddoesnotpurporttoaddressallofthesions.Theeffectuponthesepropertiesofchangeinmoisturesafetyconcerns,ifany,associatedwithitsuse.Itisthecontentduetowaterabsorptiondependslargelyonthetypeofresponsibilityoftheuserofthisstandardtoestablishappro-
7、exposure(byimmersioninwaterorbyexposuretohighpriatesafetyandhealthpracticesanddeterminetheapplica-humidity),shapeofthepart,andinherentpropertiesofthebilityofregulatorylimitationspriortouse.plastic.Withnonhomogeneousmaterials,suchaslaminatedforms,therateofwater
8、absorptionmaybewidelydifferentNOTE1—ISO62istechnicallyequivalenttothistestmethod.througheachedgeandsurface.Evenforotherwisehomoge-neousmaterials,itmaybeslightlygreaterthroughcutedg
