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The level of protection is determined by the FFP rating: FFP2 is 92% and FFP3 is 98% efficient, based on the total inward leakage of air around the edges of the mask. Higher levels of efficiency are achieved with a better face seal, though this will depend upon the concentration of contaminants. These masks use electrostatic material and are disposable; designed for eight hours of use. When not in use store in a sealed bag away from direct sunlight. Leaving the mask in sunlight will cause the straps to dry out and deteriorate.