Cartridge protects against certain organic vapors at concentrations up to 10 times the Permissible Exposure Limit (PEL) with half facepieces or 50 times PEL with full facepieces. NIOSH approved. Not for use in environments that are immediately dangerous to life or health (IDLH). For use with 3M reusable respirators. Filter Type: Gas/Vapor; Filtration For: Organic Vapors; For Use With: 3M reusable respirators.