GENERAL PURPOSE CASTABLE REFRACTORY
Refractory material is one that retains its strength at high temperatures. 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 (811 K; 538 °C).
Refractory materials are used in linings for furnaces, kilns, incinerators and reactors. They are also used to make crucibles and molds for casting glass and metals and for surfacing flame deflector systems for rocket launch structures. Today, the iron- and steel-industry uses approximately 70% of all refractories produced.