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The use of CO2 was to __________ the sand mould.

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in Foundry and Forging by (110k points)
The use of CO2 was to __________ the sand mould.

(a) Harden

(b) Soften

(c) Dry

(d) Clean

The question was posed to me in a job interview.

I'm obligated to ask this question of Carbon Dioxide Mould topic in chapter Moulding Machines & Special Moulding Processes of Foundry and Forging

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Best answer
Right option is (a) Harden

Best explanation: The idea of hardening sand moulds by gassing it with carbon-di-oxide was conceived. However, the CO2 molding has been adopted for a wide range and scale for modern core making.

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