3M™ 2138 P3R Filters protect against solids and liquid particles, with extra protection against organic and acid gases, vapours under limit, as well as ozone up to 10 x TLV. Additionally against organic vapour and acid gases below OEL. Suitable for 3M™ 6000 Series and 3M™ 7000 Series Half and Full Face Masks. Typical industrial applications for filters are pharmaceutical, powdered chemicals, construction, quarrying ceramics, refractory materials, foundries, agriculture, woodworking and food industry. Pack of 20.