How much time (in a minute) is usually required for the passing of Co2 through the mould?(a) One(b) Two(c) Five(d) SevenThe question was asked during a job interview.My question comes from CO2 Process topic in section Special Casting Techniques of Casting-Forming-Welding I

How much time (in a minute) is usually required for the passing of Co2

1.	How much time (in a minute) is usually required for the passing of Co2 through the mould?(a) One(b) Two(c) Five(d) SevenThe question was asked during a job interview.My question comes from CO2 Process topic in section Special Casting Techniques of Casting-Forming-Welding I
Answer» The correct choice is (a) ONE To elaborate: In CO2 moulding, mould of sand is hardened by passing of Co2 for about one minute. The Co2 gas FORMS a WEAK acid that hydrolyzes the sodium silicate (Na2O, SiO2) solution to FORM amorphous silica gel which acts as the bond and sodium silicate itself also provides some bonding action.

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How much time (in a minute) is usually required for the passing of Co2 through the mould?(a) One(b) Two(c) Five(d) SevenThe question was asked during a job interview.My question comes from CO2 Process topic in section Special Casting Techniques of Casting-Forming-Welding I

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