Babbitting is a metal alloy coating that goes on a base metal to protect it from wear. Typically, the Babbitting process is used on investment castings, which are made of cast iron. As part of the Babbitting process, the relatively soft bearing material bonds to a much stronger base metal, giving it support. Even though lead-base alloys enjoy a cost advantage, but we at AJR use tin-based alloys for environmental and longevity issues.