What is Refractory?
[[File:Torpedo car refractory bricks.JPG|thumb|Refractory bricks in [[United States]]]] A '''refractory''' is a [[material]] that can stand high [[temperature]]. It is used in [[furnace]]s, [[kiln]]s, [[incinerator]]s and [[reactor]]s. Materials to make refractory must be [[Chemical substance|chemically]] and physically stable at high temperature, such as [[Aluminium oxide|alumina]], [[silica]], [[magnesia]] and lime. == Types of refractory == === Based on material === * Acidic refractory * Neutral refractory * Basic refractory === Based on ways to manufacture === * Dry press process * Fused cast * Hand molded * Formed * Unformed * Unformed dry vibratable === Based on operating temperature === * Normal refractory * High refractory * Super refractory [[Category:Materials]] {{sci-stub}}