【英文标准名称】:StandardTestMethodforTurnerandNewall(TandN)Wet-LengthClassificationofAsbestos
【原文标准名称】:石棉的T/N湿度.长度分类标准试验方法
【标准号】:ASTMC1121/C1121M-2004(2009)e1
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【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】:C17.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:asbestos;classification;length;lengthclassification;TandN;TurnerandNewall;wetlength;wetlengthclassification
【摘要】:Thistestmethodprovidesasimpleprocedureforobtaininginformationonthefiberlengthdistributionofsuitableasbestosfiber.Theuseofrelativelylowcostapparatus,smalltestspecimens,andashorttestperiod,enhancetheusefulnessofthistestmethod.Normally,resultsobtainedbythistestmethodarereproducibleundercomparablelaboratoryconditions.However,closeagreementcannotbeexpectedunlessalldeviationsfromtheprocedure,howeverminor,areavoided.Moreover,resultsforlongerfibergradesareinfluencedtoagreaterextentbydifferencesinfiberlengthdistribution,andcharacteristics,thanarethoseforshortergrades.Thistestissuitableforspecificationacceptanceandmanufacturingcontrol.Itisassumedthatallundersizedfibers,andonlythose,willpassthroughanygivensieveaperture.However,thisidealizedconditionisnotnormallyachieved.Thus,resultsshouldnotbemisconstruedastruelengthdistributiondata.1.1ThistestmethodcoverstheoperationoftheTurnerandNewall(TandN)wetsievingclassifierforasbestos,andaprocedureforthedeterminationoffiberlengthdistributionandfines(definedinTerminologyD2946)contentofmilledasbestosfiber(x2212;74x03BC;m[200mesh])sievedescribedinSpecificationE11.1.2Forpurposesofestimatinglengthdistribution,thetestislimitedtosamplesfreefromexcessivequantitiesofnon-fibrousparticlesorcontaminants.Quantitiesexceeding0.05gretainedinanygivenlengthfractionsareconsideredexcessive.1.3Forcomparisonsbetweendifferentfibergrades,onlythosespecimenswhichhaveapproximatelythesamedegreeoffiberizationasdeterminedbyTestMethodsD2752willgivecompletelymeaningfulresults.1.4Thistestmethodisnotapplicabletoultrafinegradesofasbestospowderswhichcontainlittleornofibersretainedona74-x03BC;m[200mesh]sieve.ThismethodisrestrictedtoQuebecStandardgrades4Ato7DinclusiveasdeterminedbyTestMethodD3639.Note18212;ThisisanalternativeproceduretoTestMethodD2589.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.6Warningx2014;Breathingofasbestosdustishazardous.Asbestosandasbestosproductspresentdemonstratedhealthrisksforusersandforthosewithwhomtheycomeintocontact.Inadditiontootherprecautions,whenworkingwithasbestos-cementproducts,minimizethedustthatresults.Forinformationonthesafeuseofchrysoltileasbestos,refertox201C;SafeUseofChrysotileAsbestos:AManualonPreventiveandControlMeasures.x201D;1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyan......
【中国标准分类号】:Q61
【国际标准分类号】:91_100_40
【页数】:5P.;A4
【正文语种】:英语