The Honeywell HSP MC/P100 Medium (RWS-54031) is a reusable half mask respirator that comes with MC/P100 cartridges and filters. It is a thermoplastic elastomer half mask that is latex free and NIOSH approved for use against organic vapors, ammonia, methylamine, formaldehyde, and acid gas. It can be used for sanding, welding, painting, vapor protection, pesticide application, lead, saw dust, and asbestos.