3M  Orange Mercury Vapor/Chlorine/Sulfur Dioxide Gas Cartridge is designed to provide respiratory protection mercury vapor, chlorine or sulphur dioxide gas at concentrations up to 10 times the Permissible Exposure Limit (PEL) with half face pieces or 50 times PEL with full face pieces. It features swept-back design for enhanced field of view and balance. It can be used for a variety of applications including petrochemical or chemical processing, utilities, pharmaceuticals, mining and primary metals. Cartridge is equipped with Passive End of Service Life Indicator (ESLI) and is NIOSH approved.