3M 2135 for use in concentrations of particulates upto 20x Workplace Exposure Limit (WEL) when fitted to a 3M half mask or up to 40x WEL when fitted to a 3M full face mask. These are suitable for use with all 3M reusable respirators, including the 3M 6000 Series Half Mask Respirators; 3M 6000 Series Full Face Respirators and 3M 7500 Series Respirators. These are P3 Filters which are suitable for providing the highest levels of protection against Particulates including Asbestos and Silica Dusts. Particulate Filters 3M 2135 protect against solids and liquid particles P3R. Suitable for use with 3Mâ„¢ 6000 and 3Mâ„¢ 7000 Series Half Face and Full Face Masks. Bayonet fitting allows filters to be clicked into place for ease of fitting.