Traffic signs and highway billboards

Traffic signs (stop signs, speed limit signs, direction signs) and highway billboards must withstand intense sunlight, acid rain, dust, snow, and even vandalism with spray paint. Reflective FRP sheets with an epoxy or polyester coating are a modern alternative to aluminum sheets. These sheets are produced by pultrusion, and then a reflective layer is applied using pressure-sensitive adhesive.

Advantages of FRP sheets include light weight (one-third of aluminum), no corrosion in salty air (coastal areas), and high flexural strength (no deformation under strong winds). Additionally, the long-term total cost is lower because there is no need for repainting. Alborz Organic Materials Company supplies clear resins with very high photostability (less than 5% yellowing after 5 years) and pre-colored (pre-impregnated) FRP sheets for highway signs.