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==Origin==
==Origin==
alteration of ''refractary'', from [[Latin]] ''refractarius'', irregular from ''refragari'' to oppose, from ''re''- + -''fragari'' (as in ''suffragari'' to [[support]] with one's [[vote]])
alteration of ''refractary'', from [[Latin]] ''refractarius'', irregular from ''refragari'' to oppose, from ''re''- + -''fragari'' (as in ''suffragari'' to [[support]] with one's [[vote]])
*[http://en.wikipedia.org/wiki/17th_century 1606]
*[https://en.wikipedia.org/wiki/17th_century 1606]
==Definitions==
==Definitions==
*1: resisting [[control]] or [[authority]] : stubborn, unmanageable
*1: resisting [[control]] or [[authority]] : stubborn, unmanageable
*3: [[difficult]] to [[fuse]], corrode, or draw out; especially : capable of enduring high [[temperature]]
*3: [[difficult]] to [[fuse]], corrode, or draw out; especially : capable of enduring high [[temperature]]
==Description==
==Description==
A '''refractory''' [[material]] is one that retains its [[strength]] at high [[temperatures]]. [http://en.wikipedia.org/wiki/ASTM_International ASTM] C71 defines refractories as "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)".
A '''refractory''' [[material]] is one that retains its [[strength]] at high [[temperatures]]. [https://en.wikipedia.org/wiki/ASTM_International ASTM] C71 defines refractories as "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, [http://en.wikipedia.org/wiki/Kiln kilns], incinerators and [http://en.wikipedia.org/wiki/Nuclear_reactor_technology reactors]. They are also used to make [http://en.wikipedia.org/wiki/Crucible crucibles].[http://en.wikipedia.org/wiki/Refractory]
Refractory materials are used in linings for furnaces, [https://en.wikipedia.org/wiki/Kiln kilns], incinerators and [https://en.wikipedia.org/wiki/Nuclear_reactor_technology reactors]. They are also used to make [https://en.wikipedia.org/wiki/Crucible crucibles].[https://en.wikipedia.org/wiki/Refractory]
[[Category: General Reference]]
[[Category: General Reference]]