ASTM-F312 › Standard Test Methods for Microscopical Sizing and Counting Particles from Aerospace Fluids on Membrane Filters
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Scope
1.1 These methods cover the determination of the size distribution and quantity of particulate matter contamination from aerospace fluids isolated on a membrane filter. The microscopical techniques described may also be applied to other properly prepared samples of small particles. Two methods are described for sizing particles as follows:
1.1.1 Method A -Particle sizes are measured as the diameter of a circle whose area is equal to the projected area of the particle.
1.1.2 Method B -Particle sizes are measured by their longest dimension.
1.2 The test methods are intended for application to particle contamination determination of aerospace fluids, gases, surfaces, and environments.
1.3 These methods do not provide for sizing particles smaller than 5 [mu]m.
Note 1-Results of these methods are subject to variables inherent in any statistical method. The use of these methods as a standard for initially establishing limits should be avoided unless ample tolerances are permissible.
Keywords
Aerospace fluids/propellants-particulate contamination; Contamination-aerospace materials; Counting; Membrane filters (MF)-aerospace fluids; Microscopic examination-aerospace materials; Particulate contamination-aerospace fluids; particulate contaminant from aerospace fluids, on membrane filters; ICS Number Code 49.080 (Aerospace fluid systems and components)
To find similar documents by ASTM Volume:
15.03 (Space Simulation; Aerospace and Aircraft; Composite Materials)
To find similar documents by classification:
49.080 (Aerospace fluid systems and components)
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Document Number
ASTM-F0312-08R23
Revision Level
2008 R23 EDITION
Status
Current
Modification Type
Revision
Publication Date
Sept. 19, 2023
Document Type
Test Method
Page Count
4 pages
Committee Number
E21.05