MM4M Particle Respirators FFP1, FFP2 and FFP3 are not reusable, so it is advised that their use should not last more than one working day. For more information such as: application and limitations, meaning of the color code, verification before use, adjustment and placement, usage, storage, meaning of symbols, use of the equipment in explosive atmospheres, use in oxygen deficiency or highly contaminated environments, please see leaflet inside the box.