DIN VDE 0472 T.254-1985 电缆、绝缘导线的试验.多波形光导纤维的孔径
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来源:标准资料网
【英文标准名称】:Testingofcables,wiresandflexiblecords;numericalapertureofmultimodeopticalfibres
【原文标准名称】:电缆、绝缘导线的试验.多波形光导纤维的孔径
【标准号】:DINVDE0472T.254-1985
【标准状态】:作废
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【发布单位】:德国标准化学会(DE-DIN)
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【标准类型】:()
【标准水平】:()
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【中国标准分类号】:
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基本信息
标准名称: | 石棉纸板 |
英文名称: | Asbestos paper and millboard |
中标分类: |
建材 >>
其他非金属矿制品 >>
石棉材料 |
ICS分类: |
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替代情况: | 替代JC/T 69-2000 |
发布部门: | 中华人民共和国工业和信息化部 |
发布日期: | 2009-12-04 |
实施日期: | 2010-06-01 |
首发日期: | |
作废日期: | |
归口单位: | 全国非金属矿产品及制品标准化技术委员会 |
起草单位: | 咸阳非金属矿研究设计院 |
出版社: | 建材工业出版社 |
出版日期: | 2010-06-01 |
书号: | 1580227.240 |
适用范围
本标准规定了石棉纸板的分类、技术要求、试验方法、检验规则及包装、标志、运输和贮存等。
本标准适用于作为500℃以下的隔热、保温和包覆式密封垫片内衬材料的石棉纸板。
前言
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引用标准
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所属分类: 建材 其他非金属矿制品 石棉材料
【英文标准名称】:StandardTestMethodforMonitoringAtmosphericCorrosionTestsbyElectricalResistanceProbes
【原文标准名称】:用电阻试样监测大气腐蚀试验的试验方法
【标准号】:ASTMB826-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:B02.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:atmosphericcorrosionmonitor;atmosphericcorrosiontesting;corrosivitymonitor;electricalresistanceprobe;environmentaltest;mixedflowinggastest;resistancemonitorprobe;Atmosphericcorrosionanalysis;Corrosivegastesting;Corrosivitymonito
【摘要】:Corrosivitymonitoringoftestenvironmentsprovidesameanstomonitoranintegratedvalueoftestcorrosivitywhichcannotbeevaluatedfromtestparametersthemselves,suchastemperature,humidity,andgasconcentration.Assuchthemonitorvaluecanbeusedforspecificationpurposessuchastestvalidation.Electricalresistancemonitoringofconductorsexposedtocorrosivemediaisawell-establishedpractice.,,,Theresistancemethodassumesuniformcorrosionovertheentiresurfaceoftheexposedmetalconductorsegment.Localcorrosionsuchaspitting,crevice,orgrainboundarycorrosionmayprovideinvalidestimatesoftestcorrosivity.Markedchangesinslopeofthecurveofelectricalresistanceratioversustimemayindicateundesiredprocesseswhichcanbeduetodeficienciesinthetestatmosphereorinthemonitoritself.BecauseoflimitationsofthediffusionprocesswithinthecorrosionproductformedonthemetalconductorsegmentoftheRMprobewhenpassivatingcorrosionfilmsareformed,resistancemonitoringmaynotbeusefulfortestchambermonitoringpurposesforverylongtestexposures.ChambermonitoringisdependentondetectingchangesintherateofcorrosionoftheRMasanindicatorsignalthatspecifiedgasconcentrationsmustbereverified.However,lowcorrosionrateslimittheabsolutevalueoftherateofchangeofcorrosionratewithchangeoftestconditions;forparabolicfilmgrowthprocesses,thegrowthratedecreaseswithtimelimitingthesensitivityoftheRMatextendedtesttimes.SincecorrosionratecanbeacomplexfunctionoftestparametersinMFGtestswithanygivenmetalprimarilyresponsivetoasubsetofthegasesintheMFGenvironment,morethanonetypemetalresistanceprobeisrequiredinordertoassistinmaintenanceofrelativegasconcentrations.Forsuchtestspecifications,valuesofresistanceratiosmustbereferredtoratiosobtainedunderknowntestconditionsassuppliedbythetestspecifier.Informationrelatingtothesensitivityofvariousmetalstovariouscorrodantshasbeenpublished.,RMprobescanbeusefulfrom1%ofthicknessconsumedupwardto50%ofthicknessconsumedbythecorrosionfilmgrowth.Conductorthicknessesbetween25nmand0.2mmhavebeenreportedandcommonsizesareavailablecommercially.1.1Thistestmethodprovidesameansformonitoringcorrosivityofenvironmentalteststhatinvolveexposuretocorrosivegases.1.2Thistestmethodusesaresistancemonitor(RM)probefabricatedfromachosenmetalconductor,withoneconductorsegmentuncoveredtopermitexposureofthechosenmetalconductortothecorrosivegasmixtureandthesecondconductorsegmentcoveredtoprotectthemetalconductorofthissegmentfromdirectattackbythecorrosivegasmixture.Thecoveredconductorsegmentprovidesareferenceforevaluatingchangesintheuncoveredsegment.Theratiooftheresistanceoftheexposedsegmenttothatofthecoveredsegmentprovidesameasureoftheamountofmetalconductorthathasreactedwiththecorrosivegastestenvironmenttoformpoorlyconductingcorrosionproduct,thusprovidingameasureoftestcorrosivity.1.3Resistancemonitoringisapplicabletoabroadrangeoftestconditionsbyselectionoftheappropriatemetalconductorandinitialmetalthickness.1.4ThismethodissimilarinintenttoTestMethodsB808.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithits......
【中国标准分类号】:H25
【国际标准分类号】:77_060
【页数】:4P.;A4
【正文语种】:英语