ASTM F318-78(1996)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: F 318 – 78 (Reapproved 1996)
Standard Practice for
Sampling Airborne Particulate Contamination in Clean
Rooms for Handling Aerospace Fluids
This standard is issued under the fixed designation F 318; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope present to interrupt the airflow.
1.1 This practice covers a procedure for sampling airborne
4. Summary of Practice
particulate matter larger than 5 μm in size. The method is
4.1 This practice is based on the impingement of particles
designed to be used in specific areas, commonly called “clean
on a filter membrane using a vacuum technique. The number of
rooms” in the aerospace industry where aerospace fluids are
air samples required in a given area will be based upon the
handled.
geometric floor area, the disturbance to the “uninterrupted
NOTE 1—Practice F 50 is an alternative procedure.
airflow pattern,” and the room volume.
1.2 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 Filter Holder—Aerosol open-type for a filter mem-
responsibility of the user of this standard to establish appro-
brane.
priate safety and health practices and determine the applica-
5.2 Vacuum Pump or Aspirator—Minimum capacity 25 in.
bility of regulatory limitations prior to use.
(635 mm) Hg at 10 standard L/min.
2. Referenced Documents
5.3 Flowmeter—Orifice-type, rotameter-type or equivalent
positive flow-indicating device, capable of being calibrated to
2.1 ASTM Standards:
D 1193 Specification for Reagent Water a 65 % flow accuracy under sample area ambient conditions.
Calibration must be at a given vacuum using a given diameter
D 1836 Specification for Commercial Hexanes
D 2021 Specification for Neutral Detergent, 40 Percent and length of line from the vacuum source to the filter holder
containing a filter membrane of the same pore size as used in
Alkylbenzene Sulfonate Type
F 50 Practice for Continuous Sizing and Counting of Air- the test sample.
5.4 Membrane Filter—A nominal overall diameter with
borne Particles in Dust-Controlled Areas and Clean Rooms
Using Instruments Capable of Detecting Single Sub- grid lines, in dimensional accord with the filter holder, may be
used. The pore size should be selected with regard to pertinent
Micrometre and Larger Particles
F 312 Methods for Microscopical Sizing and Counting particle ranges and a specified flow rate across an effective
sampling area of 1000 mm 6 5 %. Color contrast is recom-
Particles from Aerospace Fluids on Membrane Filters
mended to aid in identification of particulate matter.
3. Terminology
5.5 Forceps—Stainless steel, nonmagnetic, unserrated tips.
3.1 Definitions: 5.6 Microscope and Associated Apparatus—For a descrip-
3.1.1 clean room—an area in which the temperature, hu- tion of a suitable apparatus, refer to Methods F 312.
midity, and the airborne particulate contamination are con- 5.7 Wash Bottle, fitted with an in-line filtration capability.
trolled as required.
6. Reagents and Materials
3.1.2 uninterrupted airflow pattern—the pattern of airflow
6.1 Purity of Reagents—Reagent grade chemicals shall be
that exists in a given area, when no personnel or equipment are
used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit-
This practice is under the jurisdiction of ASTM Committee E-21 on Space
tee on Analytical Reagents of the American Chemical Society,
Simulation and Applications of Space Technology and is the direct responsibility of
where such specifications are available. Other grades may be
Subcommittee E21.05 on Contamination.
Current edition approved Aug. 25, 1978. Published October 1978. Originally
published as D 2407 – 65 T. Last previous edition F 318 – 69 (1976). Designated
F 318 in 1970. Reagent Chemicals, American Chemical Society Specifications, American
Annual Book of ASTM Standards, Vol 11.01. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Annual Book of ASTM Standards, Vol 06.04. listed by the American Chemical Society, see Analar Standards for Laboratory
Annual Book of ASTM Standards, Vol 15.04. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Annual Book of ASTM Standards, Vol 10.05. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
Annual Book of ASTM Standards, Vol 14.02. MD.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
F 318
used, provided it is first ascertained that the reagent is of alcohol, a petroleum ether (30 to 60°C boiling range), or either
sufficiently high purity to permit its use without lessening the trichloromonofluoromethane or trichlorotrifluoroethane.
accuracy of the determination. 8.2 Maintain the area used for loading the filter holder and
6.2 Purity of Water—Unless otherwise indicated, references background counting in a condition of cleanliness equal to or
to water shall be understood to mean reagent water conforming superior to the area being sampled.
to Spe
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