3M Cartridge 6002 Acid Gas NIOSH approved against certain acid gases. Use with 3Mâ„¢ Half and Full Facepieces 6000, 7000 and FF-400 Series with bayonet filter holders. - Acid gas cartridge - Swept-back design for enhanced field of view and balance - Use with 3Mâ„¢ Reusable Respirators