Question

_________________ binders are used for large dry sand cores.

(a) Sulfate Binders

(b) Pitch

(c) Dextrin

(d) Gelatinalized Starch

The question was asked in semester exam.

This interesting question is from Types of Binders in the Moulding Sand, Types of Base Sand in portion Casting Processes of Foundry and Forging

Answer 1

Right choice is (a) Sulfate Binders

The best I can explain: Sulfate Binders are compounds of wood sugars produced in paper pulp process. It is being used (up to 15%) in the large and dry sand cores as an ingredient of the Pitch as it contains the specified qualities required.