3M Particulate Filter 3M2091, P100 is NIOSH approved for environments containing certain oil and non-oil based particles up to 10 times OSHA PEL with half face pieces or 50 times PEL with full face pieces. Full face pieces must be quantitatively fit tested to claim assigned protection factor above 10 in negative pressure mode. against exposure to lead, asbestos, cadmium, arsenic and MDA. Compatible with a variety of 3M half and full face pieces, for use in a variety of applications including: welding, brazing, torch cutting, metal pouring and soldering. 2 Each Per Bag.