NIOSH approved for environments containing certain oil and non-oil based particles. Use with 3M Respirators 5000 Series or Cartridges 6000 Series with 3M Adapter 502, 3M Face-pieces 6000 Series, or 3M Face-pieces 7000 Series with bayonet filter holder. When properly fitted, use in a variety of applications including welding, brazing, torch cutting, metal pouring, soldering, and exposure to lead, asbestos, cadmium, arsenic, and MDA for concentrations up to 10 times the Permissible Exposure Limit (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. Do not use in environments that are immediately dangerous to life or health (IDLH).