Multi-Purpose Respirator, Half Mask, NIOSH OV/AG/P100, Flexible Face Piece For Better Seal, Low Profile Cartridges For Unobstructed View, Approved For 42CFRS4 Regulation As Well As P100 Filter Class, Approved For Ammonia, Organic Vapors, Chlorine, Hydrogen Chloride, Chlorine Dioxide, Sulphur Dioxide, Hydrogen Sulfide For Escape Only, Formaldehyde, Hydrogen Fluoride & Methylamine Gases, Uses #SWX00325, Multi Purpose Replacement Cartridge.