M

Mr. Dubey • 52.30K Points
Coach 

Q. Co2 moulding is mainly used for the increase in strength and hardness of the moulds and cores.

(A) true
(B) false
(C) ---
(D) ---
Correct : Option (A)

Explanation: 
 mould is prepared by adding sodium silicate binder. co2 gas is supplied to the mould for sufficient time. it reacts with sodium silicate and produces silica gel which has better bonding properties. due to this strength and hardness of the large sized moulds and cores can be increased.

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