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

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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 %
Answer» C. 6 to 10 %

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