Respirator features a comfortable, flexible facepiece and lightweight cartridges for an unobstructed view of your project. The high-efficiency filters are pleated for extra surface area adding long life while filtering 99.97% of dust 0.3 microns and larger. Approved by NIOSH under the NIOSH 42 CFR 84 respirator certification regulations, approved for the P100 filter classification. Use replacement cartridge 10023960 (Sku #782.7280). | MSA Toxic Dust Respirator