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【英文标准名称】:StandardPracticeforSamplingforParticulateContaminationbyTapeLift
【原文标准名称】:用胶带提取法对表面微粒子污染取样的标准规程
【标准号】:ASTME1216-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:E21.05
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:航空航天运输;污染;材料;工艺;抽样方法;航天技术;表面
【英文主题词】:particulatecontamination;pressure-sensitivetape;sampling
【摘要】:Thetapeliftprovidesarapidandsimpletechniqueforremovingparticlesfromasurfaceanddeterminingtheirnumberandsizedistribution.Byusingstatisticallydeterminedsamplesizeandlocations,anestimateofthesurfacecleanlinessleveloflargeareascanbemade.Theusershalldefinethesamplingplan.Thesamplingplanshallconsidertheimportanceofsurfacegeometryandsurfaceorientationtogasflow,gravity,obstructions,andprevioushistoryofhardware.Thesefactorsinfluenceparticlefalloutandentrapmentofparticlesonthesurface.Thegeometryofjoints,recessedareas,fasteners,andthecorrespondenceofparticle-countdatatoareacanbemaintained.Theselectionoftapeandtheverificationofitseffectonthecleanlinessofthehardwareisveryimportant.Thetapeadhesiveshouldhavesufficientcohesiontoavoidtransferoftheadhesivetothesurfaceundertest.Theimpactofadhesivetransfershouldbeevaluatedbylaboratorytestingbeforeusingthetapeonthehardware.Sincepotentialforadhesivetransferexists,cleaningtoremoveanyadhesivemightberequired.Inaddition,thetapeshouldhavelowoutgassingcharacteristics,andasaminimum,itshouldmeettherequirementsoflessthan1.0%totalmassloss(TML)and0.1%collectedvolatilecondensablematerials(CVCM),asmeasuredbyTestMethodE595.Careshouldbeexercisedindecidingwhichsurfacesshouldbetestedbythispractice.Thetapecanremovemarginallyadheringpaintandcoatings.Opticalsurfacesshouldnotbetesteduntilverificationhasbeenmadethatthesurfacecoatingwillnotbedamaged.Roughsurfacefinishesresultinlowremovalefficiencies.Surfacefinishesuptoapproximately3.20x03BC;m(125x03BC;in.)havebeentestedandfoundtogivesatisfactoryresults.Thispracticehasbeentestedonlyonsurfacesatroomtemperature.Evaluationoftemperatureeffectsmustbeconductedpriortousingthetestonsurfacesotherthanroomtemperature.Onlypersonnelexperiencedinmicroscopicparticle-countingtechniquesshouldbeusedtocountandsizetheparticles.1.1Thispracticecoversproceduresforsamplingsurfacestodeterminethepresenceofparticulatecontamination,5mandlarger.Thepracticeconsistsoftheapplicationofapressure-sensitivetapetothesurfacefollowedbytheremovalofparticulatecontaminationwiththeremovalofthetape.Thetapewiththeadheringparticlesisthenmountedoncountingslides.Countingandmeasuringofparticlesisdonebystandardtechniques.1.2Thispracticedescribesthematerialsandequipmentrequiredtoperformsamplingofsurfacesforparticlecountingandsizing.1.3Thecriteriaforacceptanceorrejectionofapartforconformancetosurfacecleanlinesslevelrequirementsshallbedeterminedbytheuserandarenotincludedinthispractice.1.4Thispracticeisforuseonsurfacesthatarenotdamagedbytheapplicationofadhesivetape.Theuseofthispracticeonanysurfaceofanymaterialnotpreviouslytestedorforwhichthesusceptibilitytodamageisunknownisnotrecommended.Ingeneral,metals,metalplating,andoxidecoatingswillnotbedamaged.Applicationtopainted,vapordeposited,andopticalcoatingsshouldbeevaluatedbeforeimplementingthistest.1.5Thispracticeprovidesthreemethodstoevaluatetapelifttests,asfollows:SectionsPracticeA-Thismethoduseslighttransmittedthroughthetapeandtapeadhesivetodetectparticlesthatadheretoit.4to6PracticeB-Thismethoduseslighttransmittedthroughthetapeadhesiveafterbondingtoabasemicr......
【中国标准分类号】:V70
【国际标准分类号】:49_040;49_140
【页数】:5P.;A4
【正文语种】: