Face mask respirator, more commonly referred to as particulate respirators or dust masks, are sold in the half-face variety and are typically used for protection against airborne particles.
Reusable respirators, on the other hand, are available in both the half-face and full-face variety and can offer protection not only against airborne particulates, but gases, fumes and vapors as well. For most reusable respirators, you will need to purchase cartridges or filters to attach to the facepiece. The type of cartridges or filters you will need to purchase is dependent on the level of protection you desire.