Difference between revisions of "Heat-resistant glass"
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== Description == | == Description == | ||
| − | Glass that is dimensionally stable during large heat fluctuations. Four types of heat-resistant glass are: [http://cameo.mfa.org/materials/fullrecord.asp?name=borosilicate | + | Glass that is dimensionally stable during large heat fluctuations. Four types of heat-resistant glass are: [http://cameo.mfa.org/materials/fullrecord.asp?name=borosilicate%20glass borosilicate], [http://cameo.mfa.org/materials/fullrecord.asp?name=alumina%20glass alumina glass], alkaline-free [http://cameo.mfa.org/materials/fullrecord.asp?name=silica silica] and [http://cameo.mfa.org/materials/fullrecord.asp?name=quartz quartz]. Borosilicate glass typically contains silica (81%), [http://cameo.mfa.org/materials/fullrecord.asp?name=boric%20oxide boric oxide] (13%), [http://cameo.mfa.org/materials/fullrecord.asp?name=soda soda] (4%) with some [http://cameo.mfa.org/materials/fullrecord.asp?name=alumina alumina]. It has a very low thermal expansion coefficient and a high softening point (>600C). Examples of borosilicate glass are [http://cameo.mfa.org/materials/fullrecord.asp?name=Pyrex%C2%AE Pyrex®], Duran and Kimax. Alkaline-free silica glass also has high thermal resistance. A normal glass mixture is softened then leached in an acid bath to remove alkalis followed by heating to 1100C to fill voids. This produces a hard glass, such as Vicor, that can be used up to 870C. [http://cameo.mfa.org/materials/fullrecord.asp?name=Quartz%20glass Quartz glass], or pure fused silica, also provides excellent thermal stability. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
| − | heat resistant glass; verre | + | heat resistant glass; verre résistant au chaud (Fr.); Duran; Kimex [Owens Illinois]; Pyrex [Corning Glass]; Vicor [Corning Glass] |
== Authority == | == Authority == | ||
| − | * | + | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 361 |
| − | * | + | * Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 06:37, 24 July 2013
Description
Glass that is dimensionally stable during large heat fluctuations. Four types of heat-resistant glass are: borosilicate, alumina glass, alkaline-free silica and quartz. Borosilicate glass typically contains silica (81%), boric oxide (13%), soda (4%) with some alumina. It has a very low thermal expansion coefficient and a high softening point (>600C). Examples of borosilicate glass are Pyrex®, Duran and Kimax. Alkaline-free silica glass also has high thermal resistance. A normal glass mixture is softened then leached in an acid bath to remove alkalis followed by heating to 1100C to fill voids. This produces a hard glass, such as Vicor, that can be used up to 870C. Quartz glass, or pure fused silica, also provides excellent thermal stability.
Synonyms and Related Terms
heat resistant glass; verre résistant au chaud (Fr.); Duran; Kimex [Owens Illinois]; Pyrex [Corning Glass]; Vicor [Corning Glass]
Authority
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 361
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993