The 3M 6003 Organic Vapor - Acid Gas Cartridge is NIOSH approved against certain organic vapors or acid gas. Use with 3M" Half and Full Facepieces 6000 Series and 3M" Half and Full Facepieces 7000 Series with bayonet style cartridge holders. 2 cartridges per pack/box. General respiratory information along with product specific info please visit our Respiratory Protection General Information page. Questions involving respiratory protection or any regulations and safety concerns please see our Respiatory FAQ's page.