This work investigated the effects of bentonite, cassava starch,and yam starch binders on foundry moulding sand. The threebinders were applied separately to River Niger bank silica sandin different proportions. The effects of these various additionson foundry moulding sand were investigated by conductingout various tests as permeability, moisture content, greencompressive strength, dry compressive strength, mouldability,shatter index as well as the AFS of the sand. The results showedthat bentonite had better binding characteristics as compared tocassava starch and yam starch. The green and dry compressivestrength of the three binder’s increases as the percentage binderaddition increased. Mouldability of the three binders on the sandequally increases as the percentage binder additions increases.Permeability and shatter index for the three binders decreased asthe quantity of binder increased. The sieves analysis results withAFS number 45 shows that the grain fineness index falls withinthe acceptable range which is suitable for foundry application.
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