Res-protek 8103PR filter is a A1 E1 P3 R D combined type filter designed to provide protection against certain Chlorine, Chlorine Dioxide, Hydrogen Chloride, Hydrogen, Fluoride, Hydrogen Sulfide and organic gases and vapors with a boiling point above 65°C. These may include solvents, hydrocarbons, and other organic compounds, as well as particulate matter (P3).