All of our aluminum used in the manufacturing of interstate highway guide and regulatory warning signs goes through a chemical etching and corrosion treatment process. In Interstate SignWays’ 169,000 square foot facility, we house our own chemical etching and corrosion treatment tanks. This allows us to maintain a higher level of quality control and production capacity. Each piece of flat sheet, increment and extruded panel aluminum is dipped into a chemical bath. This process etches the aluminum panel’s service to ensure better adhesion of the guide sign sheeting as well as provides increased corrosion protection.