Molded from pure silicon rubber material with no extra additives. The most comfortable, quickest to clean up and durability provides long service life. . suitable for Oil & Non Oil Based Particulate Aerosols including Silica Dust, Lead Dust and Fumes, Break Dust, Exotic Welding, Glass Fibers, Asbestos(Note: specific limitations apply for asbestos removal, see OSHA 1910.1001) andNuisance Levels of Organic Vapors below the Permissible Exposure Levels (PEL) in Ziplock Bag