Fire resistance refers to the ability of refractory materials to resist high temperatures without melting under no load. Fire resistance is the basis for determining whether a material can be used as a refractory material. The International Organization for Standardization defines inorganic non-metallic materials with a fire resistance of 1500 ℃ or higher as refractory materials. The meaning of refractoriness is different from melting point. The fire resistance cannot be used as the operating temperature for refractory materials. The basic factor determining the fire resistance is the chemical mineral composition and distribution of the material. Various impurities, especially those with strong flux effects, can seriously reduce the fire resistance of the product.
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