NO. 77 ALLOY addresses problems that occur when melting Aluminum Bronze and Silicon Bronze alloys. Gas is absorbed during the melting cycle and released as the castings solidify, creating small “worm” holes. Typically, additions of ½ to one percent, introduced several minutes prior to pouring and plunged to the bottom of the melt using an iron stirring rod, will degasify the melt and greatly improve fluidity. In a tilting furnace, the degassifier should be dropped into the stream after the transfer ladle is approximately 20 percent full. This alloy is produced in ingot form.