NIOSH approved for environments containing certain oil and non-oil based particles. Use with 3M Facepieces 6000 Series or 3M Facepieces 7000 Series with bayonet filter holders. 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 facepieces or 50 times PEL with full facepieces. Full facepieces must be quantitatively fit tested to claim assigned protection factor above 10 in negative pressure mode. Also offers nuisance level relief from acid gases that are below the PEL. Do not use in environments that are immediately dangerous to life or health (IDLH).