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Heat
strengthened glass is made in a horizontal
furnace, which is heated electrically. Uniform
temperature of approximately 660°C is
maintained to heat the glass.
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Like,
tempered glass here too glass is conveyed
by ceramic rolls through these furnace at
a speed which regulates temperature.
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The
heat strengthening process is generally
similar to that tempered glass with the
exception of heat temperature being lower
and the cooling cycle being less rapid.
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Heat
strengthened glass has a breaking resistance
approximately twice as high as annealed
glass.
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Heat
strengthened glass breaks into larger pieces
and remains in the window frames.
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Heat
strengthened glass with its lower processing
temperature results in the facade having
less optical distortion.
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