The 2135 series Disc Filter Particulate provides lightweight filter option for 3M™ half and full face respirators. This series filter has been classified as a P3 particulate filter and is thus able to be used for protection from mechanically and/or thermally generated particulates i.e. it provides protection against dusts, mists and fumes, as well as for toxic materials like beryllium. This can be used with all 3M 6000, 3M 7000 and 3M 7500 series half masks and full face masks. Advanced Electret media for maximal filtration efficiency and is light weight Lighter than conventional filters that provide comparable protection Durable, water-resistant and flame retardant Bayonet fitting ensures precise and safer locking Low breathing resistance.