ISO 3142-1974 丁香花油

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【英文标准名称】:StandardTestMethodsforAirPermeabilityofAsbestosFibers
【原文标准名称】:石棉纤维透气性的标准试验方法
【标准号】:ASTMD2752-1988(2006)
【标准状态】:现行
【国别】:
【发布日期】:1988
【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】:石棉;纺织纤维;施工材料;材料;建筑;试验;透气率;塑料;纺织材料;耐化学腐蚀材料
【英文主题词】:airpermeability;asbestos;Dyckerhoff;fiber;permeability;RapidSurfaceArea;specificsurface
【摘要】:Thedegreeoffiberizationorsubdivisionoftheasbestosfiberbundlesinaspecimenisrelatedtoitsresistancetoairflow.Thenumberandsizeoftheporesinthespecimenareafunctionofthesizeofthefiberbundlesanddeterminetheresistancetoairflowthroughtheplug.Testspecimensthathaveundergoneahigherdegreeoffiberizationwillyieldhigherresultsprovidedthespecimenscomparedareofsimilarspecificgravitiesandotherpropertiesarenotmarkedlydifferent.Thesetestmethodsaresuitableforspecificationacceptance,manufacturingcontrol,development,andappliedresearch.Itmustnotbeassumedthatalltestspecimenswithequaltestresultshaveundergoneequivalentdegreesoffiberization.Sometypesofasbestosfiberizemorereadilythanothers.Particlesizedistributionandharshnesscanalsoinfluencepermeability.1.1Thesetestmethodscoverthemeasurementoftherelativedegreeofopennessordegreeoffiberizationofmilledasbestosfiberbyairpermeabilityinstruments.1.2MethodAistherecommendedprocedureanddescribesadeterminationbymeansoftheRapidSurfaceAreaapparatus.Thistestmethodislimitedtofiberswithaneffectivesurfaceareaintherangefrom10to250dm2/g(490to12000ft2/lb).1.3MethodBisanalternativeprocedureandcoverstheuseoftheDyckerhoffapparatus.Thistestmethodislimitedtofiberswithintherangefrom10to600Dyckerhoffseconds.1.4Onlythoseasbestosspecimenswhichareofsimilarspecificgravitieswillbearstrictcomparisonbytheseairpermeabilitymethodssincedifferencesindensityresultinspecimensbeingtestedunderdifferentconditionsofporosity.1.5Samplescontainingexcessivequantitiesofnonfibrousparticlesorcontaminantswillnotgivereliableormeaningfulresults.1.6ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsinparenthesesareprovidedforinformationonly.1.7Breathingofasbestosdustishazardous.Asbestosandasbestosproductspresentdemonstratedhealthrisksforusersandforthosewithwhomtheycomeintocontact.Inadditiontootherprecautions,whenworkingwithasbestos-cementproducts,minimizethedustthatresults.Forinformationonthesafeuseofchrysotileasbestos,referto"SafeUseofChrysotile:AManualonPreventiveandControlMeasures."Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q61
【国际标准分类号】:59_060_30
【页数】:10P.;A4
【正文语种】:


【英文标准名称】:CaptiveC-washer
【原文标准名称】:夹具用C型转动垫圈
【标准号】:DIN6371-1972
【标准状态】:作废
【国别】:德国
【发布日期】:1972-05
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:尺寸;C型保险垫圈;钻模和夹具;加工设备;钻模;材料;垫圈
【英文主题词】:jigs;washers;dimensions;captivec-washers;productionequipment;materials;jigsandfixtures
【摘要】:
【中国标准分类号】:J45
【国际标准分类号】:4225
【页数】:1P;A4
【正文语种】:德语