How much percentage of sodium silicate (Na2SiO3) is added to the sand mixture in Co2 moulding?(a) 0 to 2 %(b) 2 to 6 %(c) 6 to 10 %(d) 10 to 14 %The question was posed to me in an international level competition.The doubt is from CO2 Process in division Special Casting Techniques of Casting-Forming-Welding I

How much percentage of sodium silicate (Na2SiO3) is added to the sand

1.	How much percentage of sodium silicate (Na2SiO3) is added to the sand mixture in Co2 moulding?(a) 0 to 2 %(b) 2 to 6 %(c) 6 to 10 %(d) 10 to 14 %The question was posed to me in an international level competition.The doubt is from CO2 Process in division Special Casting Techniques of Casting-Forming-Welding I
Answer» Correct ANSWER is (b) 2 to 6 % Best explanation: No other things like clay, water and resins are added to the sand except sodium silicate, which reacts with the sand MIX to increase the flow-ability to fill up corners and INTRICATE contours. Then the Co2 is supplied to the mould and reaction takes PLACE as follows: Na2SiO3 + Co2—–>SiO2 + Na2Co3 Where, SiO2 is having gelling action (Silica gel).

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