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Macor
Macor is the trademark for a machineable glass-ceramic developed and sold by Corning Inc. It is a white material that looks somewhat like porcelain. Macor is a good thermal insulator, and is stable up to temperatures of 1000 °C, with very little thermal expansion or outgassing. It can be machined into any shape using standard metalworking bits and tools. ==Composition== Macor is made up of fluorphlogopite mica in a borosilicate glass matrix. Its composition is roughly: *46% silica (SiO2) *17% magnesium oxide (MgO) *16% aluminium oxide (Al2O3) *10% potassium oxide (K2O) *7% boron trioxide (B2O3) *4% fluorine (F)
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