This casting mold was made and sold the 1930s. Aluminum Silicon Bronze
Silicon Aluminum Bronze: What It Is and How It's Used A comparison of silicon bronze vs brass rod This new alloy combines the higher mechanical properties of the aluminum bronzes with a high machinability rating generally only found in alloys with lower Interested in TIG brazing silicon bronze? Get all the tips and tricks you need from welder/fabricator Josh Welton. TIG brazing with Aluminum Welding Rods: What You NEED to Know ...