For indoor and outdoor use
Thick, rigid polycarbonate plastic has permanently bonded 10 mil photoluminescent film with printed surface10+ hr glow rating meets ASTM 'safety grade markings' and 'wayfinding' standards to see the message in the darkImpact and UV-resistant, has rounded corners and 3/16 in mounting holes for installation
OSHA 29 CFR 1910.37(b)(2), 1910.145