The ceramic products made of Fused silica are characterized by excellent thermal shock resistance, low thermal conductivity, small expansion coefficient, high temperature resistance, good thermal stability, corrosion resistance, etc. The products are not only resistant to sudden changes of temperature but also have excellent thermal insulation performance; the Fused silica materials are processed into lightweight thermal insulation products with a thermal insulation effect unmatched by other refractory lightweight thermal insulation products, which have been successfully applied to the metallurgy, building materials, chemical engineering, national defense, scientific research and other departments.