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__________ additives improve the permeability of the molds.

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in Engineering Material & Metallurgy by (773k points)
__________ additives improve the permeability of the molds.

(a) Sawdust

(b) Seacoal

(c) Cereals

(d) Silica flour

The question was posed to me in class test.

Origin of the question is Mold Making topic in division Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

1 Answer

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Best answer
The correct answer is (a) Sawdust

Best explanation: Additives are added to the molding sand to improve the properties of the mold. Seacoal is a finely powered bituminous coal used to obtain smoother and cleaner surfaces of castings. Sawdust used in dry conditions improves the permeability and deformability of the molds.

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