【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】:Ultrasonics-Physiotherapysystems-Performancerequirementsandmethodsofmeasurementinthefrequencyrange0,5MHzto5MHz
【原文标准名称】:超声学理疗装置0.5MHz～5MHz频率范围内的性能要求和测量方法
【标准号】:IEC61689-1996
【标准状态】:作废
【国别】:国际
【发布日期】:1996-08
【实施或试行日期】:
【发布单位】:国际电工委员会(IEC)
【起草单位】:IEC/TC87
【标准类型】:()
【标准水平】:()
【中文主题词】:超声波学;物理治疗;测量;测量技术;声学
【英文主题词】:Acoustics;Definition;Definitions;Measurement;Measuringtechniques;Medicalequipment;Performanceinservice;Physiotherapy;Ratings;Soundpressure;Testing;Ultrasonicdevices;Ultrasonicengineering;Ultrasonicfrequencies;Ultrasonics
【摘要】:Appliestoultrasonicequipmentdesignedforphysiotherapyconsistingofanultrasonictransducergeneratingultrasonicenergyinthefrequencyrange0,5MHzto5MHz.ReplacesIEC150,publishedin1963.
【中国标准分类号】:C41
【国际标准分类号】:11_040_60
【页数】:112P;A4
【正文语种】:英语