This P100 cartridge works with the 3M Respirators. Can provide protection against contaminants up to 10 times the permissible exposure level (PEL) when used with half facepiece respirators or up to 50 times the PEL when used with full facepiece respirators. Approval: 99.97 percent efficient against solid and liquid aerosols including oil. Cartridge can only be used alone.