Porosity is induced in insulating refractories by adding Options: A . &nbsppowdered naphthalene. B . &nbspammonium chloride/sulphate. C . &nbspcalcium phosphate. D . &nbspall (a), (b) and (c).

Porosity is induced in

Question

Porosity is induced in insulating refractories by adding

Options:

A . powdered naphthalene.

B . ammonium chloride/sulphate.

C . calcium phosphate.

D . all (a), (b) and (c).

Answer: Option D

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