ASTM F 312 Standard Methods for Microscopical Sizing and Counting Particles from Aerospace Fluids on Membrane Filters

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ASTM F 312 Document Information:

Title
Standard Methods for Microscopical Sizing and Counting Particles from Aerospace Fluids on Membrane Filters

ASTM International

Publication Date:
Apr 10, 1997

Scope:

These test 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 test methods are described for sizing particles as follows:

Test Method A - Particle sizes are measured as the diameter of a circle whose area is equal to the projected area of the particle.

Test Method B - Particle sizes are measured by their longest dimension.

The test methods are intended for application to particle contamination determination of aerospace fluids, gases, surfaces, and environments.

These test methods do not provide for sizing particles smaller than 5 µm.

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.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Keywords:

aerospace environments

aerospace fluids

aerospace gases

aerospace surfaces

membrane filter

microscopical counting particles

microscopical sizing particles

particulate matter contamination

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