Question

______________ is used as an abrasive in the shot blasting method.

(a) Zircon

(b) Coal tar

(c) Chilled iron grit

(d) Molasses

I have been asked this question in quiz.

Asked question is from Fettling and Cleaning of Castings in chapter Concept of Gating and Risering of Foundry and Forging

Answer 1

Correct choice is (c) Chilled iron grit

The best explanation: Chilled iron grit or grit is made by crushing shot. It has irregular sharp edges which act as thousands of tiny chisels and produce more of the scrubbing action than shots in a shot blasting method.