An insulating refractory brick should have high porosity and low therm – McqOptions

MCQOPTIONS

1.	An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?
A.	Cork
B.	Saw dust
C.	Sand
D.	Chemically prepared foam
Answer» D. Chemically prepared foam

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