NO. 66 ALLOY contains components that absorb oxygen and other gasses during the melting cycle of Nickel Silvers, eliminating spongy and porous castings. 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 produce the desired effect. In a tilting furnace, the degassifier should be dropped into the stream after the transfer ladle is approximately 20 percent full. No. 66 is manufactured in ingot form.