Asbestos Clearance Air SamplingAuthor: 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.