DIN EN ISO 24234-2005 牙医学.牙科用汞齐合金用汞及合金

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【英文标准名称】:Dentistry-Mercuryandalloysfordentalamalgam(ISO24234:2004);GermanversionENISO24234:2004
【原文标准名称】:牙医学.牙科用汞齐合金用汞及合金
【标准号】:DINENISO24234-2005
【标准状态】:作废
【国别】:德国
【发布日期】:2005-01
【实施或试行日期】:
【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】:材料;视觉的;汞;残留物;可混用性;混汞器;汞合金;表面;加标签;牙科学;定义;试验方法;符号;规范;物理性能;材料规范;试样制备;汞齐合金;组分;包装件;牙科材料;合金;规范(验收);作标记;试验;化学成分
【英文主题词】:Alloys;Amalgamators;Amalgams;Chemicalcomposition;Compatibility;Composition;Definition;Definitions;Dentalmaterials;Dentistry;Labelling;Marking;Materials;Materialsspecification;Mercury;Mercuryalloys;Packages;Physicalproperties;Residues;Specification(approval);Specifications;Specimenpreparation;Surfaces;Symbols;Testmethods;Testing;Tests;Visual
【摘要】:Thisstandardspecifiestherequirementsandtestmethodsforalloysandformercurysuitableforthepreparationofdentalamalgam,togetherwiththerequirementsandtestmethodsforthatamalgamandtherequirementsforpackagingandmarking.Itisapplicabletoalloyssuppliedintheformofeitherapowderinbulk,orapowdercompressedtoformatablet,orapowderinpredosedcapsules.Itisapplicabletodentalmercurysuppliedeitherinbulkquantities,orinpredosedsachets,orinpredosedcapsules.ThisInternationalStandarddoesnotexcludethesupplyofalloyormercuryseparately.ThisStandardisnotapplicabletoalloysintendedforusewithliquidmetalsthatarenotmercury,norisitapplicabletoliquidmetalalloys.
【中国标准分类号】:C33
【国际标准分类号】:11_060_10
【页数】:38P.;A4
【正文语种】:德语


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【英文标准名称】:StandardTestMethodforTwistinSingleSpunYarnsbytheUntwist-RetwistMethod
【原文标准名称】:退捻加捻法测定单细纱捻数的标准试验方法
【标准号】:ASTMD1422-1999(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1999
【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】:D13.58
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:spunyarn;twist;Twist--textiles
【摘要】:Thistestmethodisusedforacceptancetestinginthetradeforeconomicreasonseventhoughitislessaccuratethanthedirectmethod,TestMethodD1423.Iftherearedifferencesorpracticalsignificancebetweenreportedtestresultsfortwolaboratories(ormore),comparativetestsshouldbeperformedtodetermineiftheirisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,thetestsamplesshouldbeusedthatareashomogeneousaspossible,thataredrawnfromthematerialfromwhichthedisparatetestresultsareobtained,andthatareassignedrandomlyinequalnumberstoeachlaboratoryfortesting.Othermaterialswithestablishedtestvaluesmaybeusedforthispurpose.Thetestresultsfromthetwolaboratoriesshouldbecomparedusingastatisticaltestforunpaireddata,ataprobabilitylevelchosenpriortothetestingseries.Ifabiasisfound,eitheritscausemustbefoundandcorrected,orfuturetestresultsmustbeadjustedinconsiderationoftheknownbias.Thex201C;settingx201D;oftwistinsomefiberscausesexcessivecontractionwhentheyarnisretwistedinthereversedirection.Therefore,thenumberofturnsrequiredtobringthespecimenbacktoitsoriginallengthmaybelessthanthenumberofturnsremovedinuntwisting.Thiseffectmaybepartiallyoffsetbytheuseofhigherpretensioningloads;butthisincreasesthedangerofstretchingtheyarn.Littleinformationisavailableonthecorrecttensionstouseforyarnsmadefromdifferentfibersorwithdifferentamountsoftwist.Inadditiontobeinglesstedious,thistestmethodrequiresfewerspecimensthanthedirect-countingmethodandtheresultsmaybesufficientlyaccurateforcertainpurposes.Thistestmethodcanbeusefulinthosecaseswherethemainobjectiveistomeasurevariationsfromanaveragevalue.Anotherpossibleapplicationiswherealargeamountoftwisttestingisrequiredonyarnsofsimilartypeandtwist.Inthiscasepreliminarytestscomparingthismethodandthedirectmethodcouldbeusedtodeterminethecorrectpretension.Twisthasimportanteffectsonthephysicalpropertiesofyarn.Low-twistyarnisloftyandisusuallypreferredforknittingbecauseofitssoftness,coveringpower,andwarmth.Increasingtheamountoftwistcausesanincreaseinyarnstrengthbyincreasingfibercohesion,butasthetwistangleincreasesbeyondanoptimumpoint,strengthdecreasesduetoalossineffectivefibercontribution.Maximumyarnstrengthisobtainedbyinsertingamediumamountoftwisttoobtainanoptimumbalancebetweenthesetwoopposingforces.Hightwistproducesyarnsofhighdensity(x201C;hardx201D;orx201C;wiryx201D;)andhighelongationandmayimprovetheabrasionandimpactresistanceoffabrics.Theoptimumtwistforeithermanufacturingefficiencyorphysicalpropertiesusuallyincreasesasstaplelengthdecreases.Thetwistinayarnbeforeitispackagedmaybedifferentfromthatoftheyarnafterithasbeenwithdrawnfromthepackagebecauseofchangesintensionandtheeffectofthemethodofwithdrawal.Iftheyarniswithdrawnover-end,aslightincreaseordecreaseintwistwilltakeplace,dependinguponthedirectionofthetwistintheyarn,thedirectionofwindingonthepackage,andthelengthoftheturn(orwrap)onthepackage.Note28212;Thedifferenceintwistbetweenunwindingfromthesideandover-endis1/x03C0;d,wheredisthediameterofthepackage.Thus,fora25-mm(1-in.)diameterpacka......
基本信息
标准名称:工业用磷酸 铅含量的测定 原子吸收分光光度法
中标分类: 化工 >> 无机化工原料 >> 氧化物、单质
替代情况:原标准号ZB G11002-88
发布日期:
实施日期:2000-08-01
首发日期:
作废日期:
出版日期:
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所属分类: 化工 无机化工原料 氧化物 单质