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【英文标准名称】:StandardTestMethodforMeasurementoftheSurfaceTensionofSolidCoatings,SubstratesandPigmentsusingContactAngleMeasurements
【原文标准名称】:使用接触角测量固体涂料、基质和颜料的表面张力的标准试验方法
【标准号】:ASTMD7490-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D01.23
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:adhesion;contactangles;dispersionandpolarcomponentsofsolidsurfacetension;solidsurfacetension;wetting
【摘要】:Themethoddescribedinthisstandardisbasedontheconceptthatthetotalfreeenergyatasurfaceisthesumofcontributionsfromdifferentintermolecularforces,suchasdispersion,polarandhydrogenbonding.Thereareothertechniquesthatemploythreecomponents(dispersion,polarandhydrogenbonding).Thesemethodsarefurthercomplicatedbyneedingthreetofivetestliquidsandarenotpracticalforroutinetesting.Thismethodusescontactanglesoftwoliquidstoprovidedataforthecalculationoftwocomponents,dispersion,x03B3;sd,andpolar,x03B3;sp.Dispersionandpolarcomponentdata,alongwiththetotalsolidsurfacetension,areusefulforexplainingorpredictingwettingoradhesion,orboth,ofcoatingsonpretreatments,substratesandothercoatings.Lowsolidsurfacetensionvaluesoftenareasignofcontaminationandportendpotentialwettingproblems.Highpolarcomponentsmaysignalpolarcontamination.Thereisevidenceintheliteraturethatmatchingofpolarcomponentsoftopcoatsandprimersgivesbetteradhesion.Solidsurfacetensionsofpigments,particularlythepolarcomponents,maybeusefulinunderstandingdispersionproblemsortoprovidesignalsforthecompositionofdispersantsandmillbases.However,comparisonofpigmentsmaybedifficultiftherearedifferencesintheroughnessorporosity,orboth,ofthediskspreparedfromthem.Althoughthistechniqueisveryusefulincharacterizingsurfaces,evaluatingsurfaceactiveadditivesandexplainingproblems,itisnotdesignedtobeaqualitycontrolorspecificationtest.1.1Thistestmethoddescribesaprocedureforthemeasurementofcontactanglesoftwoliquids,onepolarandtheothernonpolar,ofknownsurfacetensiononasubstrate,pigment(intheformofadisk),orcuredorairdriedcoatinginordertocalculatethesurfaceproperties(surfacetensionanditsdispersionandpolarcomponents)ofthesolid.1.2Thetotalsolidsurfacetensionrangethatcanbedeterminedusingthismethodisapproximately20to60dynes/cm.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G50
【国际标准分类号】:87_040
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:Coverplatesandcovertapesfortheprotectionandlocationwarningofburiedcablesorburiedconduitsinundergroundinstallations;GermanversionEN50520:2009
【原文标准名称】:地下装置中直埋电缆或埋地管道的保护和定位警告用盖板和覆盖胶布
【标准号】:DINEN50520-2010
【标准状态】:现行
【国别】:德国
【发布日期】:2010-05
【实施或试行日期】:2010-05-01
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:电缆覆盖;电缆外皮;电缆;隐蔽安装;导(线)管;覆盖薄片;盖板;封盖物;定义;接地线;电缆系统;电气工程;电气装置;电气安全;箔;作标记;机械性能;挡泥板;性能;防电击;保护覆盖层;保护设备;安全;机器的安全装置;规范(验收);试验;试验条件;埋设电缆;地下管道;地下装置;警告装置
【英文主题词】:Cablecovering;Cablecovers;Cables;Concealedinstallations;Conduits;Coverfoils;Coverplates;Coveringslabs;Covers;Definitions;Earthwires;Electriccablesystems;Electricalengineering;Electricalinstallations;Electricalsafety;Foil;Marking;Mechanicalproperties;Mudguards;Properties;Protectionagainstelectricshocks;Protectioncoverings;Protectiondevices;Safety;Safetyappliancesformachines;Specification(approval);Testing;Testingconditions;Undergroundcables;Undergroundconduits;Undergroundinstallations;Warningdevices
【摘要】:ThisEuropeanStandardestablishestherequirementsandtestsforcoverplatesandcoverfoilsusedforthemechanicalprotection,identificationandwarningofthelocationofcablesburiedunderground.
【中国标准分类号】:P94
【国际标准分类号】:29_120_10
【页数】:16P.;A4
【正文语种】:德语