How much silica do silica refractories usually contain?
How much silica do silica refractories usually contain? Correct Answer 95 – 97%
Silica is a common type of acid refractory material containing high amounts of silica and low amount of alumina. It contains about 95 – 97% of SiO2, 0.2 – 1.0% of Al2O3, 1.8 – 3.5% of CaO, and 0.3 – 0.9% of Fe2O3. It has an approximate fusion temperature of 1700oC.