Ett refraktiskt material behåller sin styrka vid höga temperaturer. ASTM International C71 definierar refraktorer som "non-metallic materials having those chemical and physical properties that make them applicable for structures, or as components of systems, that are exposed to environments above 1,000 °F" (538 °C).

Ett refraktiskt material behåller sin styrka vid höga temperaturer. ASTM International C71 definierar refraktorer som "non-metallic materials having those chemical and physical properties that make them applicable for structures, or as components of systems, that are exposed to environments above 1,000 °F" (538 °C).