The composition of moulding sand for foundry

摘要

"The composition of moulding sand for foundry.Pieces of gray or nodular cast iron, comprising approximately: 78 to 86.7% of sand; 10 to 12% and bentonite sodium; 1 to 5% of phenolic compounds with organic and inorganic powders loads usually obtained from pieces of bakelite and decorative or electric; and 2.5 5% water.