3M 8514 respirator particulate mask provides at least 95% filter efficiency against particulate contaminants free of oil. Welding mask 3M 8514 respirator is ideal for welding, soldering and other metal fume applications including welding on galvanized and stainless steel. Includes a carbon layer to help remove nuisance level organic vapors and ozone. Features include advanced electric media, 3M Cool Flow Exhalation Valve and adjustable straps. Filter material is resistant to caking. Not NIOSH approved for ozone. NIOSH 42 CFR 84 classification of N95. (95% efficient, not resistant to oil). The 3M n95 mask is great for: welding, soldering, grinding, sanding, bagging and other dusty/hot environments, foundry operations, lab settings, undercoating and petrochemical activities. Box of 10.