SAFETY WORKS Multi-Purpose Replacement Cartridge, Filter Rating: P100, Magenta, Suitable for: SWX Series Full Face pieces or Half-Mask Face pieces RespiratorLong-life cartridges are approved to the NIOSH P100 Class, so they are at least 99.97% efficient against oil- and non-oil based contaminants, and are oil-proof so they have no time use limitationThe cartridges are also NIOSH Approved against Chlorine, Hydrogen Chloride, Hydrogen Sulfide, and Organic VaporsThe cartridges include integral high efficiency (99.97% against 0.3 micron particles) filters and an impregnated bed of special activated carbonThe cartridges are certified by NIOSH with P100/OV/CL/SD/HC approvalsThese cartridges are only compatible with SWX series Full Facepieces or Half-Mask Facepieces