【英文标准名称】:OutlineofInvestigationforLowVoltageFuses-ClassCDFusesIssueNumber:3
【原文标准名称】:CD类低压熔丝调查大纲.发布编号:3
【标准号】:ULSUBJECT2126-2006
【标准状态】:现行
【国别】:美国
【发布日期】:2006
【实施或试行日期】:
【发布单位】:美国保险商实验所(US-UL)
【起草单位】:UL
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:ThisOutlineofInvestigationappliestoClassCDfusesrated31-60Aand600Vac.DCratingsareoptional.
【中国标准分类号】:K31
【国际标准分类号】:
【页数】:
【正文语种】:英语


【英文标准名称】:StandardTestMethodforAsbestosStrengthUnits
【原文标准名称】:单位面积的石棉强度的标准试验方法
【标准号】:ASTMD3880/D3880M-1990(2009)e1
【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】:C17.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:asbestos;asbestos-cement;determination;evaluation;pointvalue;reinforcementpotential;strength;strengthunit
【摘要】:Thistestmethodfacilitatesthecomparisonofdifferenttypesandgradesofchrysotileasbestosbythepropertymostpertinenttoitsuseinasbestos-cement,namely,thestrengthorreinforcingvalueitimpartstotheproduct.Whilesimilarcomparativeresultscouldbeobtainedonanygivenproductionequipment,thismethodallowsthetestingofsmallsamples,avoidscostlyinterruptionsinproductionfornumeroustrialruns,andallowstestvaluestobeobtainedbyasinglestandardmethodsothatresultscanbecomparedamongdifferentlocations.StrengthUnit(SU)valueofafiberblendusedinasbestos-cementproductsmaybeestimatedbytakingtheproportionateSUvalueofeachcomponentofthefiberblend.Ifthefiberblendisformulatedwiththeaimtooptimizeanotherfiberpropertysuchasfilterability,theSUcalculationwillassurethattheblendwillnotfallbelowanacceptablestrengthlevel.Thistestmethodisrestrictedtogradesofasbestosusedinasbestos-cementproducts.Verylong(Group3)fibersaredifficulttoevaluatebythismethodbecausethetestspecimensproducedmaynotbesufficientlyhomogeneous.Similarly,veryshort(Group7)gradesmaynotberetainedsatisfactorilyinthemoldduringthepressingoftestspecimensormaynotprovidesufficientstrengthtomeetthetestrequirements.Note18212;ThetermGroup3or7referstothestandarddesignationforchrysotileasbestosgradesestablishedbytheQuebecAsbestosMiningAssociation,See2.2.Becauseofcertaindifferencesbetweenthismethodandthemanyvariationsinplantproductionprocedurecommonlyusedinasbestos-cementmanufacture,itisemphasizedthatthestrengthvaluesobtainedbythisstandardizedprocedurewillnotnecessarilygiveexactlythesamestrengthvaluesasobtainedatanyonespecificmanufacturingplant.1.1Thistestmethodgivesaprocedurefortheevaluationofthestrength-givingpropertiesofasbestosfibersusedtoreinforceasbestos-cementproducts.1.2Thepurposeofthistestmethodistodeterminethenumberofstrengthunitsthatmaybeassignedtothesampletested.1.3Asbestosfiberpossessestheabilitytoimpartstrengthtoanasbestos-cementproduct.Everyfibergrademayberegardedaspossessingacertainquantityofstrength-givingunits.Thequantityoffiberrequiredinanasbestos-cementcompositionvariesinverselywiththenumberofstrengthunitsitpossesses.Forexample,ifanamount,designatedbyX,ofafiberpossessing100strengthunitsproducesaproductofagivenstrength,2Xwouldberequiredtoproduceaproductofequivalentstrengthfromfiberpossessingonly50strengthunits.1.4Thefollowingdefinitionisthebasisforthestrengthunittest:Anasbestosfiberthatgivesthestandardstrengthatthestandarddensitywhenusedas10%ofthefurnishisdefinedashaving100strengthunits.Therefore,byknowingthepercentfiberrequiredinthemixtogivestandardstrengthatthestandarddensity,itispossibletocalculatethestrengthunitsofasampleofasbestos.1.5Thisprocedureisintendedprimarilyforchrysotileasbestos;ithasnotbeenverifiedwhetherornotitisapplicabletoothertypes.1.6ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.7Warningx2014;Breathingofasbestosdustishazardous.Asbestosa......
【中国标准分类号】:Q23
【国际标准分类号】:91_100_40
【页数】:24P.;A4
【正文语种】:英语