[[Imagen:Condorhuasi de relleno1.jpg|thumb|250px|Este horno, está realizado a partir del diseño del horno condorhuasi, con relleno refractario poroso.]] A refractory material is one that retains its strength at high temperatures. ASTM C71 defines refractories as "non-metallic materials having those chemical and physical properties that made them applicable for structures, or as components of systems, that are exposed to environments above °F ()". Refractory materials are used in linings for furnaces, kilns, incinerators and reactors. They are also used to make crucibles.
[[Imagen:Condorhuasi de relleno1.jpg|thumb|250px|Este horno, está realizado a partir del diseño del horno condorhuasi, con relleno refractario poroso.]] A refractory material is one that retains its strength at high temperatures. ASTM C71 defines refractories as "non-metallic materials having those chemical and physical properties that made them applicable for structures, or as components of systems, that are exposed to environments above °F ()". Refractory materials are used in linings for furnaces, kilns, incinerators and reactors. They are also used to make crucibles.