National Institute for Occupational Safety and Health (NIOSH) - used for industrial hygiene in foundries, glass plants, quarries, mines, ceramic manufacturing - Methods using 0.45 µm, 25 mm:

N6011 (Bromine & Chlorine) - more info
N7500 (Silica, Crystalline) - more info
N7501 (Silica, Amorphous) - more info
N7504 (Vanadium Oxide) - more info
N7505 (Lead Sulfide) - more info
N7506 (Boron Carbide) - more info
N9000 (Asbestos, Crysotile) - more info