1、Designation:E123512Standard Test Method forGravimetric Determination of Nonvolatile Residue(NVR)inEnvironmentally Controlled Areas for Spacecraft1This standard is issued under the fixed designation E1235;the number immediately following the designation indicates the year oforiginal adoption or,in th
2、e case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of nonvolatileresidue(NVR)fallout in environmental
3、ly controlled areas usedfor the assembly,testing,and processing of spacecraft.1.2 The NVR of interest is that which is deposited onsampling plate surfaces at room temperature:it is left to theuser to infer the relationship between the NVR found on thesampling plate surface and that found on any othe
4、r surfaces.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.4 The
5、 values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterE1234 Practice for Handling,Transporting,and InstallingNonvolatile Residue(NVR)Sample Plates Used in Envi
6、-ronmentally Controlled Areas for SpacecraftF50 Practice for Continuous Sizing and Counting of Air-borne Particles in Dust-Controlled Areas and CleanRooms Using Instruments Capable of Detecting SingleSub-Micrometre and Larger Particles2.2 ISO Standards:314644-1 CleanroomsandAssociatedControlledEnvir
7、onmentsPart 1:Classification of Air Cleanliness14644-2 CleanroomsandAssociatedControlledEnvironmentsPart 2:Specifications for Testing andMonitoring to Prove Continued Compliance with ISO14644-114951-3 Space SystemsFluid CharacteristicsPart 3:Ni-trogen2.3 U.S.Federal Standard:4FED-STD-209E Airborne P
8、articulate Cleanliness Classes inCleanrooms and Clean Zones2.4 Institute of Environmental Sciences and Technology:5IEST-RP-CC001.3 HEPA and ULPA FiltersIEST-RP-CC007.1 Testing ULPA FiltersIEST-RP-CC034.1 HEPA and ULPA Filter Leak TestsIEST-STD-CC1246 Product Cleanliness Levels and Con-tamination Con
9、trol Program2.5 American National Standards Institute:3ANSI/ASMEB46.1-2009 SurfaceTexture(SurfaceRoughness,Waviness,and Lay)2.6 Other:Industrial Ventilation,A Manual of Recommended Practice,Latest Edition6SMC-TR-95-28,Nonvolatile Residue Solvent Replacement,U.S.Air Force Space and Missile Systems Ce
10、nter,1March 199543.Terminology3.1 Definitions:3.1.1 ISO Class N(airborne particulate cleanliness class),nlevel of airborne particulate concentrations as defined inISO 14644-1 and 14644-2,where 10Nis the maximumallowable concentration(particles/m3).3.1.1.1 DiscussionThe considered particle sizes(lowe
11、rthreshold values)applicable for classification with ISO14644-1 are limited to the range from 0.1 through 5 m.Particles larger than 5 m(macroparticles)may be expressed inaccordance with Annex E of ISO 14644-1.1This test method is under the jurisdiction of ASTM Committee E21 on SpaceSimulation and Ap
12、plications of Space Technology and is the responsibility ofSubcommittee E21.05 on Contamination.Current edition approved Nov.1,2012.Published November 2012.Originallyapproved in 1988.Last previous edition approved in 2008 as E1235 08.DOI:10.1520/E1235-12.2For referenced ASTM standards,visit the ASTM
13、 website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www
14、.ansi.org.4Available from Standardization Documents Order Desk,Bldg.4,Section D,700 Robbins Ave.,Philadelphia,PA,19111-5094,Attn.:NPODS.5Available from Institute of Environmental Sciences,940 E.NorthwestHighway,Mount Prospect,IL 60056.6Available from Committee on Industrial Ventilation,PO Box 16153,
15、Lansing,MI 48901.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.2 FS209 class,nthe level of cleanliness specified bythe maximum allowable number of particles/ft3of air asdefined in FED-STD-209E.3.1.2.1 DiscussionThis is provided for
16、information and tofacilitate the transition to the use of the ISO classificationstandard(ISO 14644-1).3.1.3 bumping,nuneven boiling of a liquid caused byirregular rapid escape of large bubbles of highly volatilecomponents as the liquid mixture is heated or exposed tovacuum.3.1.4 cleanarea,nageneraltermthatincludescleanrooms,controlled areas,good housekeeping areas,andother areas that have contamination control by physical designand specified operating procedures.3.1.5 clean zone,na defined space
