Disposable Respirators (Respirators) are safety devices that cover the nose and mouth and helps protect the wearer from breathing in some hazardous substances. A particulate mask filters particles out of the air as you breathe. Use the Disposable respirator even if you can't see the particles because they may be too small to see.  Note: Use the right mask for the job: General Industrial, Healthcare, Welding, Odor Removing or Osha Substance Specific and NIOSH approved. N95 - 95% Protection against non-oil particulates. N99-N100 - 99% Protection against non-oil based particulates. R95 - 95% Resistant against oil based particulates. If oil aerosols are present limit to 8 hours use. P95-P100 -  Protection against oil based particulates. If used in environments containing only oil aerosols, dispose of respirator after 40 hours or 30 days, which ever occurs first.