Asbestos Clearance Air Sampling

Author: Pacific Northwest Inspections Group, LLC   Date: 05-Jan-2018.   Category: Asbestos   Add to Favorites 

PCM by NIOSH 7400

In NIOSH Method 7400, asbestos is collected on a 25 mm cellulose ester filter (cassette-equipped with a 50 mm electrically-conductive cowl). Sampling is done at 0.5 L/min or greater. Adjust sampling flow rate, Q (L/min), and time, t (min), to produce a fiber density, E, of 100 to 1300 fibers/mm 2 for optimum accuracy.