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BS EN 2428-1995 乙丙橡胶(EPM/EPDM).硬度:50IRHD(国际橡胶硬度标度)

作者:标准资料网 时间:2024-05-22 01:43:13  浏览:9340   来源:标准资料网
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【英文标准名称】:Ethylene-propylenerubber(EPM/EPDM)-Hardness50IRHD
【原文标准名称】:乙丙橡胶(EPM/EPDM).硬度:50IRHD(国际橡胶硬度标度)
【标准号】:BSEN2428-1995
【标准状态】:现行
【国别】:英国
【发布日期】:1995-11-15
【实施或试行日期】:1995-11-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:抗拉强度;合成橡胶;名称与符号;航空运输工程;材料强度;温度;硬度;航天技术;断裂伸长;低温;耐化学性试验;密度;乙丙橡胶;臭氧;压缩永久变形;热阻
【英文主题词】:Aeronauticalengineering;Aerospacetransport;Airtransport;Designations;Elastomers;EPDM;EPM;Ethylpropylene;Ethylene;Ethylene-propylenerubber;Hardness;IRHD;Materials;Non-metals;Physicalproperties;Processing;Properties;Propylene;Rubber;Silicone;Siliconerubber;Silicones;Spacetransport;Syntheticrubber;Testing;Use;Vulcanizedrubber
【摘要】:Thisstandardspecifiesthepropertiesofethylene-propylenerubber(EPM/EPDM),hardness50IRHD,foraerospaceapplications.note:1)SymbolasperISO1629
【中国标准分类号】:G35
【国际标准分类号】:49_025_40
【页数】:12P.;A4
【正文语种】:英语


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【英文标准名称】:StandardTestMethodforFieldMeasurementofSoundPowerLevelbytheTwo-SurfaceMethod
【原文标准名称】:双表面法现场测量声功率级的标准试验方法
【标准号】:ASTME1124-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:E33.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:fieldsoundpower;industrialnoise;machinerynoise;soundpower;two-surfacemethod;Acousticaltests;Ambientsoundpressurelevels;Bandfiltersets;Concavemeasurementsurfaces;Conformalmeasurementsurfaces;Convexmeasurementsurfaces;Fieldtes
【摘要】:Thefunctionandoperationofequipmentinthefieldoftenprecludethemeasurementofthefree-fieldsoundpressurelevelsofasinglepieceofequipmentintheabsenceofinterferingsoundfromotherequipmentoperatingatthesametime.Thetwo-surfacemethodwillprovide,inmostcases,areliableestimateofthenormalsoundpowerlevelsofaspecimenoperatinginanadverseenvironment.Thistestmethodisintendedforuseinthefieldinthepresenceofwhatisnormallyregardedasinterferingbackgroundnoise.ThistestmethodisbasedupontheworkofHubner,andDiehl,butdiffersfromallothercurrentsoundpowermeasurementproceduresbyrequiringsimultaneousmeasurementatbothconformalsurfacesandbyresolvingtime-averagedsoundpressurelevelsatbothsurfacestowithin0.1dB.Thesetwofeatures,simultaneousrecordingand0.1dBresolution,enablesourcesoundpowertobecalculatedwhenthedirectsoundfieldofthesourceisactuallylowerinlevelthantheambientnoise.Theuseofthistestmethodisexpectedtobeprimarilyfortherelativeassessmentofthesoundpowerfromsimilarsourcesorforthepredictionofsoundlevelsinaplantbaseduponmeasurementsofsimilarsourcesinanotherplant.Thistestmethodisbelievedtobecapableofyieldingareasonablygoodestimateofabsolutepowerlevelwithpropercareofapplicationandfullconformancetotheprovisionsofthisprocedure.Thetwo-surfacemethodisapplicableonlywhenthetwomeasurementsurfacescanbephysicallyselectedtoproducepositivevaluesofthedifferenceinaveragesoundpressurelevel.Thatis,theinnersurfacesoundpressurelevelminustheoutersurfacesoundpressurelevelmustbeatleast+0.1dB.Thislimitationappliestoeachfrequencybandandeachconstituentsurfaceareainvestigated.Onlythefrequencybandinwhichazeroornegativedifferenceoccursisitconsideredinvalidandusuallyadjacentbandswillbevalid.Inpractice,onlyrarelywillallthreeone-thirdoctavebandsofagivenoctaveyieldinvaliddataatallconstituentareas.Therefore,lessthancompleteresultsarepermissiblewhenone-thirdoctaveanalysisisusedandfulloctaveresultsarereported.Thetwo-surfacemethodmaynotproduceresultswhentestingsomeverylargemachinesinveryreverberantroomsorinroomshavingavolumelessthanabout20timesthespaceenclosedbyanenvelopearoundthelargerdimensionsofthemachine.Insuchcases,thesoundpressurelevelclosetothemachinemaynotdecreaseinanyregularwaywithincreasingdistancefromamachinesurface,makingitimpossibletoselecttwomeasurementsurfacesproducingpositivedifferencesofsoundpressurelevel.1.1Thistestmethodcoversthefield,orinsitumeasurementofsoundpowerlevelbythetwo-surfacemethod.Thetestmethodisdesignedtominimizetheeffectsofreverberantconditions,directivityofthenoisesourceunderconsideration,andtheeffectsofambientnoisefromothernearbyequipmentoperatingatthesametime.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A42
【国际标准分类号】:17_140_0
【页数】:7P.;A4
【正文语种】:英语


【英文标准名称】:StandardGuideforAnnualReviewofTestMethodsandSpecificationsforPlastics
【原文标准名称】:塑料的试验方法和规范的年度复审标准指南
【标准号】:ASTMD4968-2000
【标准状态】:作废
【国别】:美国
【发布日期】:2000
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:plastics;guidelines;standardization;processcharts
【摘要】:
【中国标准分类号】:G04
【国际标准分类号】:01_120
【页数】:13P;A4
【正文语种】:英语



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