A class of inorganic non-metallic materials having a refractoriness of not less than 1580 °C. Refractoriness refers to the Celsius temperature of a refractory cone specimen that resists high temperatures without softening and melting without a load. Refractory materials are widely used in metallurgy, chemical, petroleum, machinery manufacturing, silicate, power and other industrial fields. They are the largest in the metallurgical industry, accounting for 50% to 60% of the total output.
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