AC - Casting Alloy (Pewter) An excellent casting pewter that contains approximately 92% Tin, 7.75% Antimony and .25% Copper. The copper makes the metal more ductile so that it can be formed easier with a hammer if necessary. This is consistent with old fashion English pewter (Britannia 8) International standard for lead free pewter. Melting temperature is 563-650 F. Each ingot weighs about 1 pound and measures approximately 3/4" x 1-1/2" x 4". Our lead-free pewters are used for the finest jewelry, gifts, collectibles, novelty items, accessories, awards, and decorations. These alloys can also be used to cast into plaster of paris, sand, and rubber molds.