The 3M 5935 P3R Particulate Filter protects against solids and liquid particles. Suitable for 3M 6000 and 3M 7000 Series Half Face and Full Face Masks. Typical industrial applications for filters are pharmaceutical, powdered chemicals, construction, quarrying ceramics, refractory materials, foundries, agriculture, woodworking and food industry. Standard: EN143 Approval: CE marked 1 BOX = 20 FILTERS (NOT PAIRS)