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glass annealing furnace

A furnace, generally electrically heated, with a control system capable of following a cam by which the temperature can be made to go through a definite cycle over a period of days, or even weeks, if the glass is massive. Glass has a softening temperature above which it can be easily bent or molded to shape, and an annealing temperature below which the properties of the glass remain fixed down to room temperature. Between these two points is the annealing range in which it is essential to cool the glass very slowly to remove all strain and to drive the refractive index up to its stable maximum value.
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