Gilsonite as a Carbonaceous Laboratory tests were performed to determine the effect of five commonly used carbonaceous additives on new sand mixes. The additives evaluated were seacoal, pitch, petroleum asphalt, Gilsonite of a “coarse” and “fine” grind, and blown asphalt. The tests comprised evaluating physical properties of new sand mixes at approximately 1% volatile at 900°F (482.2°C) […]
Foundry Sand Additives and Additive I. Purpose of a Carbonaceous Additive A. Reduce imperfections due to the rapid reaction between the silica sand mold and the oxidized surface of molten iron. B. Improve sand peel from casting at shakeout. C. Produce smoother, cleaner casting surface. D. Minimize imperfections, casting losses, scrap. II. Additive Theories A. […]
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