3M Cartridge 6009 Mercury Vapor or Chlorine Acid Gas NIOSH approved against mercury vapor or chlorine. Use with 3Mâ„¢ Half and Full Facepieces 6000, 7000 and FF-400 Series with bayonet filter holders. - Mercury vapor and chlorine cartridge - Equipped with passive End of Service Life Indicator ( ESLI) - Swept-back design for enhanced field of view and balance - Use with 3Mâ„¢ Reusable Respirators