The 3M 60923 Organic Vapor/Acid Gas Filter is NIOSH approved and used in applications such as laboratories, pharmaceutical, petrochemical, and chemical manufacturing. These cartridges provide respiratory protection from hazardous gases and vapors like chlorine, hydrogen chloride, sulfur dioxide, hydrogen fluoride, hydrogen sulfide, and particles at 10 times concentrations beyond the Permissible Exposure Limit. The 3m 60923 personal filters are within compliance of Occupation Safety and Health Administration (OSHA) and within PPE standard (29 CFR 1910.132). This cartridge/filter can help reduce inhalation exposures of hazardous airborne biological particles. Sold in Pairs and best fitted with the 3M Half Mask.