Model: 2091(2040) (pair)"NIOSH / MSHA approved for dusts, fumes, mists, asbestos and radionuclides (TC-21C-488). Lighter weight than most filters - enhances worker comfort, fiberglass free - flame-retardant - water resistant to improve breathability. For use up to 10 X PEL with half mask - 50 X PEL with full faceplate or applicable OSHA limit. DO NOT USE FOR: paint spray, gases or vapors, or sandblasting. This respirator does not supply oxygen.