【英文标准名称】:StandardTestMethodsforTestingPolyurethaneRawMaterials:DeterminationofHydroxylNumbersofPolyols
【原文标准名称】:聚氨基甲酸乙酯原料的标准试验方法:多元醇的羟基数的测定
【标准号】:ASTMD4274-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【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】:D20.22
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:塑料;测定;材料;羟基值;聚氨酯;试验
【英文主题词】:aceticanhydride;esterification;hydroxylnumber;phthalicanhydride;polyester;polyether;polyol;pyromelliticdianhydride;titration
【摘要】:Thesetestmethodsaresuitableforresearchandasqualitycontrolandspecificationtests.Itisnecessarytoknowthehydroxylcontentsofpolyolsinordertoformulatepolyurethanesystems.1.1Thesetestmethodsmeasurethehydroxylgroupsinpolyesterandpolyetherpolyolscontainingprimaryandsecondaryhydroxylgroups.Theyalsoapplytomanyotherhydroxyl-containingsubstances.1.1.1TestMethodA-AceticAnhydridePressureBottlerecommendedforpolyesters.1.1.2TestMethodB-PhthalicAnhydridePressureBottlerecommendedforpolyethersandpolyesters.1.1.3TestMethodC-PhthalicAnhydrideRefluxrecommendedforpolyethersandpolyesters.1.1.4TestMethodD-Imidazole-CatalyzedPhthalicAnhydridePressureBottlerecommendedforpolyethers,polyesters,polymerpolyols,andamine-initiatedpolyols.1.1.5TestMethodEImidazole-CatalyzedPyromelliticDianhydrideEsterification,recommendedforpolyolsusedforflexibleandrigidpolyurethanefoamsandurethaneelastomers.Itisrecommendedforpolyesterpolyols,polyetherpolyols,amine-startedpolyols,andpolymerpolyols(polyacrylonitrile/copolystyrene-based).1.2OtherASTMtestmethodsformeasuringhydroxylgroupsareTestMethodsD1957andE222(seeNote0).Note18212;TestMethodCisessentiallysimilartoISO6796-1981,buttherearesomedifferencesintheconcentrationsusedandsomeproceduraldetails.TherearecurrentlynodataavailableforcomparingtheresultsofTestMethodCtothoseofISO6796-1981.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:9P.;A4
【正文语种】:


【英文标准名称】:Switchesforhouseholdandsimilarfixed-electricalinstallations-Generalrequirements
【原文标准名称】:家用和类似用途固定电器设备开关.一般要求
【标准号】:BSEN60669-1-2000+A2-2008
【标准状态】:现行
【国别】:英国
【发布日期】:2000-03-15
【实施或试行日期】:2000-03-15
【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】:老化稳定性;分类;间隙;定义;介电强度;尺寸选定;尺寸;家用的;电气工程;电气装置;电气安全;电磁适应性;电磁兼容性;耐火性;家用;铭刻;绝缘电阻;漏电路径;材料试验;防电击;评定;规范(验收);固定的;开关;试验;热稳定性;跟踪索引
【英文主题词】:Ageingstability;Classification;Clearances;Definitions;Dielectricstrength;Dimensioning;Dimensions;Domestic;Electricalengineering;Electricalinstallations;Electricalsafety;Electromagneticcompatibility;EMC;Fireresistance;Householduse;Inscription;Insulatingresistance;Leakagepaths;Materialstesting;Protectionagainstelectricshocks;Ratings;Specification(approval);Stationary;Switches;Testing;Thermalstability;Trackingindex
【摘要】:ThispartofEN60669appliestomanuallyoperatedgeneralpurposeswitches,fora.c.onlywitharatedvoltagenotexceeding440Vandaratedcurrentnotexceeding63A,intendedforhouseholdandsimilarfixedelectricalinstallations,eitherindoorsoroutdoors.Forswitchesprovidedwithscrewlessterminalstheratedcurrentislimitedto16A.Switchescoveredbythisstandardareintendedforthecontrolinnormaluseofe.g.:–acircuitforatungstenfilamentlampload,or–acircuitforafluorescentlampload(includingelectronicballast),or–acircuitforasubstantiallyresistiveloadwithapowerfactornotlessthan0,95,or–amonophasecircuitformotorloadwitharatedcurrentupto10Aandapowerfactornotlessthan0,6,or–acircuitforextralowvoltage(ELV)tungstenhalogenlamploadwithelectronicconvertorormagnetictransformer,or–acombinationofthese.NOTE1Anextensionofthescopetoswitchesforratedvoltageshigherthan440Visunderconsideration.Unlessotherwisespecifiedinsubsequentparts,thisstandardappliestoswitchesintendedtobeusedat50Hz.NOTE2SwitchesaccordingtoPart2-4areintendedforisolatingpurposes.AllotherswitchesaccordingtoEN60669seriesareintendedforfunctionalpurposesonly.NOTE3Anincreaseoftheratedcurrentof10Aformotorloadisunderconsideration.NOTE4Forthetimebeing,switcheswitharatedcurrentmorethan10Aareconsideredasa10Acurrentformotorloadswitch.NOTE5Switcheswitharatedcurrentuptoandincluding10Aaresuitableforsingle-phasemotorloadsnotexceedingtheratedcurrentoftheswitchandapowerfactornotlessthan0,6.Thestandardalsoappliestoboxesforswitches,withtheexceptionofmountingboxesforflushtypeswitches.NOTE6Generalrequirementsforboxesforflush-typeswitchesaregiveninEN60670-1.Italsoappliestoswitchessuchas:–switchesincorporatingpilotlights;–electromagneticremotecontrolswitches(particularrequirementsaregivenintherelevantPart2);–switchesincorporatingatime-delaydevice(particularrequirementsaregivenintherelevantPart2);–combinationsofswitchesandotherfunctions(withtheexceptionofswitchescombinedwithfuses);–electronicswitches(particularrequirementsaregivenintherelevantPart2);–switcheshavingfacilitiesfortheoutletandretentionofflexiblecables(seeAnnexB);–isolatingswitches(particularrequirementsaregivenintherelevantPart2).NOTE7TheminimumlengthoftheflexiblecableusedwiththeseswitchesmaybegovernedbyNationalWiringRules.Switchescomplyingwiththisstandardaresuitableforuseatambienttemperaturesnotnormallyexceeding25°C,butoccasionallyreaching35°C.NOTE8Switchescomplyingwiththisstandardaresuitableonlyforincorporationinequipmentinsuchawayandinsuchaplacethatitisunlikelythatthesurroundingambienttemperatureexceeds35°C.Inlocationswherespecialconditionsprevail,suchasinships,vehiclesandthelikeandinhazardouslocations,forexamplewhereexplosionsareliabletooccur,specialconstructionsmayberequired.
【中国标准分类号】:K31
【国际标准分类号】:29_120_40
【页数】:104P.;A4
【正文语种】:英语