【英文标准名称】:StandardTestMethodforDeterminingGasPermeabilityCharacteristicsofPlasticFilmandSheeting
【原文标准名称】:测定塑料薄膜和薄片透气性能的测试方法
【标准号】:ASTMD1434-1982(2003)
【标准状态】:现行
【国别】:
【发布日期】:1982
【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】:F02.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:塑料;铁路;测定;渗透率;箔;试验;透气性
【英文主题词】:estimation;steady-staterate
【摘要】:Thesemeasurementsgivesemiquantitativeestimatesforthegastransmissionofsinglepuregasesthroughfilmandsheeting.Correlationofmeasuredvalueswithanygivenuse,suchaspackagedcontentsprotection,mustbedeterminedbyexperience.Thegastransmissionrateisaffectedbyconditionsnotspecificallyprovidedforinthesetests,suchasmoisturecontent(Note2),plasticizercontent,andnonhomogeneities.Thesetestsdonotincludeanyprovisionfortestingsealsthatmaybeinvolvedinpackagingapplications.Note28212;Thetestsarerunusinggaswith0%moisturechanges.Interlaboratorytestinghasrevealedthatpermeancesmeasuredbytheseproceduresexhibitastrongdependenceontheprocedurebeingused,aswellasonthelaboratoryperformingthetesting.Agreementwithothermethodsissometimespoorandmaybematerial-dependent.Thematerialsbeingtestedoftenaffectthebetween-laboratoryprecision.Thecausesofthesevariationsarenotknownatthistime.Itissuggestedthatthismethodnotbeusedforrefereepurposesunlesspurchaserandsellercanbothestablishthattheyaremeasuringthesamequantitytoamutuallyagreeduponlevelofprecision.Useofthepermeabilitycoefficient(involvingconversionofthegastransmissionratetoaunitthicknessbasis)isnotrecommendedunlessthethickness-to-transmissionraterelationshipisknownfrompreviousstudies.Eveninessentiallyhomogeneousstructures,variationsinmorphology(asindicated,forexample,bydensity)andthermalhistorymayinfluencepermeability.1.1Thistestmethodcoverstheestimationofthesteady-staterateoftransmissionofagasthroughplasticsintheformoffilm,sheeting,laminates,andplastic-coatedpapersorfabrics.Thistestmethodprovidesforthedeterminationof(1)gastransmissionrate(GTR),(2)permeance,and,inthecaseofhomogeneousmaterials,(3)permeability.1.2Twoproceduresareprovided:1.2.1ProcedureMManometric.1.2.2ProcedureVVolumetric.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q22
【国际标准分类号】:
【页数】:12P.;A4
【正文语种】:


【英文标准名称】:Internalcombustionengines-Pistonrings-Part5:Qualityrequirements
【原文标准名称】:内燃机.活塞环.第5部分:质量要求
【标准号】:ISO6621-5-2005
【标准状态】:现行
【国别】:国际
【发布日期】:2005-10
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC22
【标准类型】:()
【标准水平】:()
【中文主题词】:机械工程;道路车辆;产品规范;机动车;质量控制;等级(质量);材料规范;公差(测量);可见特性;材料;作标记;工作特性;质量条件;活塞环;缺陷与故障;规范(验收);质量;内燃机;包装件;质量要求
【英文主题词】:Defects;Grades(quality);Internalcombustionengines;Marking;Materials;Materialsspecification;Mechanicalengineering;Motorvehicles;Packages;Performancecharacteristics;Pistonrings;Productspecification;Quality;Qualitycondition;Qualitycontrol;Qualityrequirements;Roadvehicles;Specification(approval);Specifications;Tolerances(measurement);Visiblecharacteristic
【摘要】:ThispartofISO6621specifiesthosequalityaspectsthatarecapableofdefinitionbutnotnormallyfoundonadrawingspecification.Itcoversthefollowing:—single-piecepistonringsofgreycastironorsteel;—multi-piecepistonrings(oilcontrolrings)consistingofcastironpartsandspringcomponents;—single-pieceandmulti-pieceoilcontrolringsofsteel,i.e.oilcontrolringsintheformofstripsteelcomponentsorsteelsegments(rails)withspringexpandercomponents.Inadditiontospecifyingcertainofthelimitsofacceptancerelatingtoinspectionmeasuringprinciples(coveredbyISO6621-2),thispartofISO6621alsocoversthosefeaturesforwhichnorecognizedquantitativemeasurementproceduresexistandwhichareonlycheckedvisuallywithnormaleyesight(spectaclesifwornnormally)andwithoutmagnification.Suchfeatures(superficialdefects)areadditionaltothestandardtolerancesofringwidth,radialwallthicknessandclosedgap.ThispartofISO6621doesnotestablishacceptablequalitylevels(AQL),itbeinglefttomanufacturerandclienttodecidetheappropriatelevelsjointly.Inthiscase,therecommendationsofISO2859arefollowed.ThispartofISO6621specifiesthequalityrequirementsofpistonringsforbothreciprocatinginternalcombustionenginesandcompressorsworkingunderanalogousconditions.Itisapplicabletoallsuchringsofadiameter≤200mm.
【中国标准分类号】:J92
【国际标准分类号】:43_060_10
【页数】:15P.;A4
【正文语种】:英语