1、Designation:F 318 78(Reapproved 2000)Standard Practice forSampling Airborne Particulate Contamination in CleanRooms for Handling Aerospace Fluids1This standard is issued under the fixed designation F 318;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a procedure for sampling airborneparticulate matter larger than 5 m in
3、 size.The method isdesigned to be used in specific areas,commonly called“cleanrooms”in the aerospace industry where aerospace fluids arehandled.NOTE1Practice F 50 is an alternative procedure.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is
4、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.2.Referenced Documents2.1 ASTM Standards:D 1193 Specification for Reagent Water2D 1836 Specification for Commercial Hexanes3D 2
5、021 Specification for Neutral Detergent,40 PercentAlkylbenzene Sulfonate Type4F 50 Practice for Continuous Sizing and Counting of Air-borne Particles in Dust-ControlledAreas and Clean RoomsUsing Instruments Capable of Detecting Single Sub-Micrometre and Larger Particles5F 312 Methods for Microscopic
6、al Sizing and CountingParticles from Aerospace Fluids on Membrane Filters63.Terminology3.1 Definitions:3.1.1 clean rooman area in which the temperature,hu-midity,and the airborne particulate contamination are con-trolled as required.3.1.2 uninterrupted airflow patternthe pattern of airflowthat exist
7、s in a given area,when no personnel or equipment arepresent to interrupt the airflow.4.Summary of Practice4.1 This practice is based on the impingement of particleson a filter membrane using a vacuum technique.The number ofair samples required in a given area will be based upon thegeometric floor ar
8、ea,the disturbance to the“uninterruptedairflow pattern,”and the room volume.5.Apparatus5.1 Filter HolderAerosol open-type for a filter mem-brane.5.2 Vacuum Pump or AspiratorMinimum capacity 25 in.(635 mm)Hg at 10 standard L/min.5.3 FlowmeterOrifice-type,rotameter-type or equivalentpositive flow-indi
9、cating device,capable of being calibrated toa 65%flow accuracy under sample area ambient conditions.Calibration must be at a given vacuum using a given diameterand length of line from the vacuum source to the filter holdercontaining a filter membrane of the same pore size as used inthe test sample.5
10、.4 Membrane FilterA nominal overall diameter withgrid lines,in dimensional accord with the filter holder,may beused.The pore size should be selected with regard to pertinentparticle ranges and a specified flow rate across an effectivesampling area of 1000 mm26 5%.Color contrast is recom-mended to ai
11、d in identification of particulate matter.5.5 ForcepsStainless steel,nonmagnetic,unserrated tips.5.6 Microscope and Associated ApparatusFor a descrip-tion of a suitable apparatus,refer to Methods F 312.5.7 Wash Bottle,fitted with an in-line filtration capability.6.Reagents and Materials6.1 Purity of
12、 ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.7Other grades may be1This practi
13、ce is under the jurisdiction of ASTM Committee E21 on SpaceSimulation and Applications of Space Technology and is the direct responsibility ofSubcommittee E21.05 on Contamination.Current edition approved Aug.25,1978.Published October 1978.Originallypublished as D 2407 65 T.Last previous edition F 31
14、8 69(1976).DesignatedF 318 in 1970.2Annual Book of ASTM Standards,Vol 11.01.3Annual Book of ASTM Standards,Vol 06.04.4Discontinued:see 1999 Annual Book of ASTM Standards,Vol 15.04.5Annual Book of ASTM Standards,Vol 15.03.6Annual Book of ASTM Standards,Vol 14.02.7Reagent Chemicals,American Chemical S
15、ociety Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Conven
16、tion,Inc.(USPC),Rockville,MD.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.used,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.6.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Specification D 1193.6.3 Detergent,free-rinsing.Material conforming to Specifi-cation D 2021 is suitable.6.4 Isop
