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【英文标准名称】:Plastics-Determinationofwaterabsorption
【原文标准名称】:塑料.吸水性的测定
【标准号】:ISO62-2008
【标准状态】:现行
【国别】:国际
【发布日期】:2008-02
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC61
【标准类型】:()
【标准水平】:()
【中文主题词】:吸收;吸收能力;测定;测量规程;湿度;潮气;塑料;水量;试件;测试;水;吸水率
【英文主题词】:Absorption;Absorptivity;Determination;Determinationprocedures;Humidity;Moisture;Plastics;Quantityofwater;Testpieces;Testing;Water;Waterabsorption
【摘要】:1.1ThisInternationalStandarddescribesaprocedurefordeterminingthemoistureabsorptionpropertiesinthe“through-the-thickness”directionofflatorcurved-formsolidplastics.ThisInternationalStandardalsodescribesproceduresfordeterminingtheamountofwaterabsorbedbyplasticspecimensofdefineddimensions,whenimmersedinwaterorwhensubjectedtohumidairundercontrolledconditions.The“through-the-thickness”moisturediffusioncoefficientcanbedeterminedforsingle-phasematerialbyassumingFickiandiffusionbehaviourwithconstantmoistureabsorptionpropertiesthroughthethicknessofthetestspecimen.Thismodelisvalidforhomogeneousmaterialsandforreinforcedpolymer-matrixcompositestestedbelowtheirglasstransitiontemperature.However,sometwo-phasematricessuchashardenedepoxiesmayrequireamulti-phaseabsorptionmodelwhichisnotcoveredbythisInternationalStandard.1.2Ideally,thebestcomparisonofthewaterabsorptionpropertiesand/ordiffusioncoefficientsofmaterialsshouldbecarriedoutonlyusingtheequilibriummoisturecontentofplasticsexposedtoidenticalconditions.Thecomparisonofmaterialsusingpropertiesatmoistureequilibriumdoesnotassume,andisthereforenotlimitedto,single-phaseFickiandiffusionbehaviour.1.3Alternatively,waterabsorptionofplasticspecimensofdefineddimensionsexposedtoimmersionorhumidityundercontrolledconditionsbutforanarbitrarytimeperiodcanbeusedtocomparedifferentbatchesofthesamematerialorforqualitycontroltestsofagivenmaterial.Forthistypeofcomparison,itisessentialthatalltestspecimensbeofidenticaldimensionsand,asnearlyaspossible,havethesamephysicalattributes,e.g.surfacesmoothness,internalstresses,etc.However,moistureequilibriumisnotreachedundertheseconditions.Therefore,resultsfromthistypeoftestcannotbeusedtocomparethewaterabsorptionpropertiesofdifferenttypesofplastics.Formorereliableresults,simultaneoustestsarerecommended.1.4TheresultsobtainedusingthemethodsdescribedinthisInternationalStandardareapplicabletomostplasticsbutarenotapplicabletocellularplastics,granulatesorpowders,whichcanshowadditionalabsorptionandcapillaryeffects.Plasticsexposedtomoistureundercontrolledconditionsfordefinedperiodsoftimeproviderelativecomparisonsbetweenthem.Thetestsdescribedforthedeterminationofthediffusioncoefficientmaynotbeapplicabletoallplastics.Plasticsthatdonotretaintheirshapewhenimmersedinboilingwatershouldnotbecomparedusingmethod2(see6.4).
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:15P;A4
【正文语种】:英语


【英文标准名称】:Railwayapplications.Fixedinstallations.D.C.switchgear.Surgearrestersandlow-voltagelimitersforspecificuseind.c.systems
【原文标准名称】:铁路应用设施.固定设备.直流开关装置.直流系统中特殊应用的电涌放电器和低电压限制器
【标准号】:BSEN50123-5-2003
【标准状态】:作废
【国别】:英国
【发布日期】:2003-07-11
【实施或试行日期】:2003-07-11
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:分类系统;直流电流;直流装置;直流变流器;接地;电力系统;电气工程;电气设备;电气装置;电气保护设备;电气测试;电传动系统;避雷防护;机车运输;低电压;低压设备;标志;过电流探测器;过电压限制器;过电压保护装置;性能测试;保护设备;轨道;铁路运输;铁路应用设施;铁路电力牵引装置;铁路工程;铁路设备;铁路固定设备;铁路装备;铁路钢轨;铁路;电阻器;装配条件;规范(验收);固定的;电源电压;电涌放电器;浪涌限制器;过电压保护;开关设备;开关装置;测试;牵引电流供电站;电压;电压极限
【英文主题词】:Classificationsystems;Directcurrent;Directcurrentinstallations;Direct-currentconvertors;Earthing;Electricpowersystems;Electricalengineering;Electricalequipment;Electricalinstallations;Electricalprotectionequipment;Electricaltesting;Electricaltransmissionsystems;Lightningprotection;Locomotivehaulage;Lowvoltage;Low-voltageinstallations;Marking;Overcurrentdetectors;Overvoltagelimiter;Overvoltageprotection;Performancetesting;Protectiondevices;Railtracks;Railtransport;Railwayapplications;Railwayelectrictractionequipment;Railwayengineering;Railwayequipment;Railwayfixedequipment;Railwayinstallations;Railwayrails;Railways;Resistors;Setting-upconditions;Specification(approval);Stationary;Supplyvoltages;Surgearresters;Surgelimiters;Surgeprotection;Switchgear;Switchgears;Testing;Tractioncurrentsupplyplants;Voltage;Voltagelimitation
【摘要】:TobereadinconjunctionwithBSEN50123-1:2003,BSEN60099-1:1994,BSEN60099-4:1993
【中国标准分类号】:S35
【国际标准分类号】:29_120_50;29_280
【页数】:38P;A4
【正文语种】:英语