3M Half Mask Organic Vapor/Acid Gas is NIOSH approved against certain organic vapors and acid gases. Use in a variety of applications, including pharmaceutical, petrochemical, utilities, aluminum reduction, chemical manufacturing, laboratories, and pulp and paper. When properly fitted, helps provide respiratory protection from certain organic vapors, chlorine, hydrogen chloride, sulfur dioxide, or hydrogen sulfide (escape only) or hydrogen fluoride at concentrations up to 10 times the Permissible Exposure Limit (PEL). Not for use in environments that are immediately dangerous to life or health (IDLH).