作者:标准资料网 时间:2024-05-29 12:05:05   浏览:8644   来源:标准资料网

【英文标准名称】:TestMethodforDensityofPolyethylenebytheUltrasoundTechnique(08.03)
【原文标准名称】:超声技术测定聚乙烯密度的方法(08.03)
【标准号】:ANSI/ASTMD4883-1999
【标准状态】:现行
【国别】:美国
【发布日期】:1999
【实施或试行日期】:1999-08-03
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:高聚物;超声波学;试验;塑料;密度
【英文主题词】:testing;polymers;ultrasonics;density;plastics
【摘要】:Thistestmethodcoversthedeterminationofthedensityofpolyethylenethroughtheutilizationofultrasoundequipment.Thistestmethodisbasedonthedistinctbehaviorsoftheamorphousandcrystallinephasesofpolyethyleneinresponsetoultrasound.Polyethylenecanbeviewedasacompositestructurewherehigh-densitycrystallineregionsareconnectedbylower-densityamorphousmaterial.Theratioofcrystallinetoamorphousmaterialdeterminesthefinaldensityofthematerial.Theamorphousandcrystallinephasesexhibitverydistinctbehaviorswithregardtothepropagationofsoundwaves.Thepropagationcharacteristicsinthecompositewilldependontherelativeamountofthetwophases(thedegreeofcrystallinity).InorganicmaterialsincreasedensityasmeasuredbyTestMethodsD792andD1505,buttheyhavelittleornoeffectonultrasonicdensity.Theultrasonicmeasurementisbasicallyabaseresindensity.ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note1-ThereisnosimilarorequivalentISOstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:
【正文语种】:英语