1.1 This test method covers the determination of particle concentration and size distribution of influent and effluent challenge test materials for filter media using a suitable suspending liquid. Challenge materials may be standard dusts or user materials. Particle size range is approximately from 0.5 to 200 [mu]m.

1.2 This standard does not purport to address all of the safety problems, 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.