ASTM F312-97
Historical Standard: ASTM F312-97 Standard Test Methods for Microscopical Sizing and Counting Particles from Aerospace Fluids on Membrane Filters
SUPERSEDED (see Active link, below)
ASTM F312
1. 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
F302 Practice for Field Sampling of Aerospace Fluids in Containers
F303 Practices for Sampling for Particles in Aerospace Fluids and Components
F311 Practice for Processing Aerospace Liquid Samples for Particulate Contamination Analysis Using Membrane Filters
F314 Methods of Test for Identification of Metallic and Fibrous Contaminants in Aerospace Fluids
F318 Practice for Sampling Airborne Particulate Contamination in Cleanrooms for Handling Aerospace Fluids
Keywords
aerospace environments; aerospace fluids; aerospace gases; aerospace surfaces; membrane filter; microscopical counting particles; microscopical sizing particles; particulate matter contamination; Aerospace particulate contamination; Contamination--aerospace materials/applications; Counting; Membrane filters (MF)--aerospace fluids; Microscopic examination--aerospace materials; Particulate contamination (aerospace environments)
ICS Code
ICS Number Code 49.080 (Aerospace fluid systems and components)
DOI: 10.1520/F0312-97
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