Stanley Personal Protection Saf-T-Fit Plus P100 Disposable Respirator RST-64020 may be disposable, but it acts like a permanent, professional-grade respirator. These comfortable and effective lab safety masks are equipped to handle a wide range of chemicals and irritants with their P-100 filters, including lead, dust, adhesive fume, and much more. In fact, these Stanley laboratory safety masks meet EPA, HUD, and OSHA filtering requirements for lead exposure. Stanley Personal Protection Saf-T-Fit Plus P100 Boomerang Face Masks are 99.97% effective against both oil and non-oil particulates, giving you constant protection against nearly everything, and an exhalation valve makes it incredibly easy to breathe with the face mask. Stanley Personal Protection has outfitted the mask with a boomerang nose seal, a soft molded cup, and adjustable suspension straps for a maximum of comfort, and the mask is latex-free. For a comprehensive filtering system that can be tossed in the garbage when you're finished, choose the Stanley Personal Protection P100 Disposable Respirator Mask.