【英文标准名称】:StandardTestMethodforMoistureinWoolbyDistillationWithToluene
【原文标准名称】:用甲苯蒸馏法测定羊毛中水分的标准试验方法
【标准号】:ASTMD2462-1990(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1990
【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】:D13.13
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:wool;moisturecontent;Distillation;Moistureanalysis--textilefabrics/fibers;Toluenedistillation;Woolandwooltop--moisturecontent
【摘要】:TestMethodD2462fortestingformoistureinwoolisconsideredsatisfactoryforacceptancetestingofcommercialshipmentssincecurrentestimatesofbetween-laboratoryprecisionareacceptable.IncaseofadisputearisingfromdifferencesinreportedtestresultswhenusingTestMethodD2462foracceptancetestingofcommercialshipments,thepurchaserandthesuppliershouldconductcomparativetestingtodetermineifthereisastatisticalbiasbetweentheirlaboratories.Competentstatisticalassistanceisrecommendedfortheinvestigationofthebias.Asaminimum,thetwopartiesshouldtakeagroupoftestspecimensthatareashomogenousaspossibleandthatarefromalotofthetypematerialinquestion.Thetestspecimensshouldbeassignedinequalnumberstoeachlaboratoryfortesting.TheaverageresultsfromthetwolaboratoriesshouldbecomparedusingStudent''st-Testforunpaireddataandanacceptanceprobabilitylevelchosenbythetwopartiesbeforethetestisbegun.Ifabiasisfound,eitheritscausemustbefoundandcorrectedorthepurchaserandthesuppliermustagreetointerpretfuturetestresultsinlightoftheknownbias.Thistestmethodisthepreferredmethodforallsuitablesamplesofwoolwhereitisimportanttoobtainaresultfreefromthepossiblebiases,introducedbytheconditionsdiscussedin5.3and5.4.Thistestmethodisfreefromtheinterferencescausedbydifferentconditionsofambientatmospheresuchasmightaffecttheresultsofoven-drying.Aslightamountofresidualmoisturemayberetainedinaspecimensubjectedtooven-dryingbecauseoftherelativehumidityoftheambientair;however,theamountofmoistureretainedmaybeestimatedfrompublisheddata.Thistestmethodisfreefromtheinterferencecausedbynonaqueousvolatilematerial.Suchmaterial,whenpresent,iserroneouslymeasuredasmoisturebyoven-dryingmethods,theextentoftheerrordependingupontheamountandcharacteristicsofanyaddedoilsorfinishes.Thistestmethodisrelativelycumbersome,timeconsuming,andcostlycomparedtooven-drying,andisnotrecommendedforroutineprocesscontrol,in-plantevaluations,orforotherpurposeswhereahighdegreeofaccuracyisnotnecessary.Thecostofoperationcanbereducedsomewhatbyredistillingtheusedtoluene,whichisthensuitableforreusewithoutfurthertreatment.Unlikeanoven-dryingmethod,anymoisturegainedorlostbyaspecimenafteritsmasshasbeendeterminedwillappearasadirecterrorinthefinalresult.Sinceoneoftheprincipalusesofthemethodistodeterminetheaveragemoisturepresentinlargelotsofwoolorwoolproductsexposedtovariableatmosphericconditions,numerouslaboratorysamplesandtestspecimensarecommon.Toavoiderrorsofthetypementionedabove,thisprocedureincludesprovisionsforstabilizingthesample(s)inthelaboratoryatmospheresothat,duringthetimenecessaryforselecting,weighing,andtransferringthespecimenstoflasks,gainorlossofmoisturewhichcannotbeaccountedforwillbeminimized.Afurtheradvantageofthestabilizingprocessisrealizedincaseswheretheinterestissolelyintheaveragemoisturecontentofthesample,andtheactualmoisturecontentwithinthesampleishighlyvariable.Bystabilizingthesamplebeforeselectingthespecimens,equalprecisioncanbeachievedwithfewerspecimens.1.1Thistestmethodcoversthedeterminationoftheamountofmoisturepresentingreasewool,scouredwool,cardedwool,garnettedwool,wooltopandintermediatewoolproducts,androvings,bydistillationwithtoluene.1.2Equationsaregivenforcalculatingtheamountofwaterpresentasmoisturecontent(as-receivedbasis)andmoistureregain(dryfiber)basis.Thetermthatcorrespondstothebasisusedinthecalculati......
【中国标准分类号】:W20
【国际标准分类号】:59_060_10
【页数】:5P.;A4
【正文语种】:英语