Aluminum: .040 Rust resistant aluminum. Painted with baked on enamel finish, Resists marring, corrosion and humidity. Furnished with rounded corners and 4 mounting holes. Best choice for indoor and outdoor applications. Lightweight and easy to install.
OSHA STANDARD 1910.97 NON-IODIZING RADIATION
(a) (3) Warning symbol. (i)
The warning symbol for radio frequency radiation hazards shall consist of a red isosceles triangle above an inverted black isosceles triangle, separated and outlined by an aluminum color border. the words "Warning-Radio-Frequency Radiation Hazard" Shall appear in the upper triangle