OnGuard 240S safety glasses are certified safe for a variety of work environments by the American National Standards Institute, whose ratings are approved by the federal Occupational Safety and Health Administration. The glasses carry the ANSI Z87.1 and CSA Z94.3 (Canadian Standards Association) ratings for protective eyewear to be worn in industrial settings and a range of occupations. ANSI’s rating is based on the eyewear’s ability to pass several key tests of everyday workplace hazards, including protection from chemical splashes and droplets, blunt impacts, dust, fine dust and radiation. OG 240S glasses meet the standards for withstanding high impacts, flames, corrosion and radiation.