ASTM F318-78(2000)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: F 318 – 78 (Reapproved 2000)
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 3.1.1 clean room—an area in which the temperature, hu-
midity, and the airborne particulate contamination are con-
1.1 This practice covers a procedure for sampling airborne
trolled as required.
particulate matter larger than 5 μm in size. The method is
3.1.2 uninterrupted airflow pattern—the pattern of airflow
designed to be used in specific areas, commonly called “clean
that exists in a given area, when no personnel or equipment are
rooms” in the aerospace industry where aerospace fluids are
present to interrupt the airflow.
handled.
NOTE 1—Practice F 50 is an alternative procedure. 4. Summary of Practice
4.1 This practice is based on the impingement of particles
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the on a filter membrane using a vacuum technique. The number of
air samples required in a given area will be based upon the
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- geometric floor area, the disturbance to the “uninterrupted
airflow pattern,” and the room volume.
bility of regulatory limitations prior to use.
2. Referenced Documents 5. Apparatus
5.1 Filter Holder—Aerosol open-type for a filter mem-
2.1 ASTM Standards:
D 1193 Specification for Reagent Water brane.
5.2 Vacuum Pump or Aspirator—Minimum capacity 25 in.
D 1836 Specification for Commercial Hexanes
D 2021 Specification for Neutral Detergent, 40 Percent (635 mm) Hg at 10 standard L/min.
5.3 Flowmeter—Orifice-type, rotameter-type or equivalent
Alkylbenzene Sulfonate Type
positive flow-indicating device, capable of being calibrated to
F 50 Practice for Continuous Sizing and Counting of Air-
borne Particles in Dust-Controlled Areas and Clean Rooms a 65 % flow accuracy under sample area ambient conditions.
Calibration must be at a given vacuum using a given diameter
Using Instruments Capable of Detecting Single Sub-
Micrometre and Larger Particles and length of line from the vacuum source to the filter holder
containing a filter membrane of the same pore size as used in
F 312 Methods for Microscopical Sizing and Counting
Particles from Aerospace Fluids on Membrane Filters the test sample.
5.4 Membrane Filter—A nominal overall diameter with
3. Terminology
grid lines, in dimensional accord with the filter holder, may be
3.1 Definitions: used. The pore size should be selected with regard to pertinent
particle ranges and a specified flow rate across an effective
sampling area of 1000 mm 6 5 %. Color contrast is recom-
This practice is under the jurisdiction of ASTM Committee E21 on Space
mended to aid in identification of particulate matter.
Simulation and Applications of Space Technology and is the direct responsibility of
5.5 Forceps—Stainless steel, nonmagnetic, unserrated tips.
Subcommittee E21.05 on Contamination.
Current edition approved Aug. 25, 1978. Published October 1978. Originally 5.6 Microscope and Associated Apparatus—For a descrip-
published as D 2407 – 65 T. Last previous edition F 318 – 69 (1976). Designated
tion of a suitable apparatus, refer to Methods F 312.
F 318 in 1970.
5.7 Wash Bottle, fitted with an in-line filtration capability.
Annual Book of ASTM Standards, Vol 11.01.
Annual Book of ASTM Standards, Vol 06.04.
Discontinued: see 1999 Annual Book of ASTM Standards, Vol 15.04.
Annual Book of ASTM Standards, Vol 15.03.
Annual Book of ASTM Standards, Vol 14.02.
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F 318
6. Reagents and Materials 8. Preparation of Apparatus
6.1 Purity of Reagents—Reagent grade chemicals shall be
8.1 Prior to sampling, clean the filter holder and forceps by
used in all tests. Unless otherwise indicated, it is intended that
washing in a free-rinsing detergent, ketone-free isopropyl
all reagents shall conform to the specifications of the Commit-
alcohol, a petroleum ether (30 to 60°C boiling range), or either
tee on Analytical Reagents of the American Chemical Society,
trichloromonofluoromethane or trichlorotrifluoroethane.
where such specifications are available. Other grades may be
8.2 Maintain the area used for loading the filter holder and
used, provided it is first ascertained that the reagent is of
background counting in a condition of cleanliness equal to or
sufficiently high purity to permit its use without lessening the
superior to the area being sampled.
accuracy of the determination.
8.3 Personnel performing loading, background count, or
6.2 Purity of Water—Unless otherwise indicated, references
unloading after sample, shall be attired in clothing consistent
to water shall be understood to mean reagent water conforming
with the cleanliness requirements of the atmosphere being
to Specification D 1193.
sampled.
6.3 De
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