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by microscopic flow in response to the intense stresses they introduce internally. The piece then heat-soaks until its temperature is even throughout and the stress relaxation is adequate. The time necessary for this step varies depending on the type of glass and its maximum thickness. The glass then is permitted to cool at a predetermined rate until its temperature passes the strain point (? = 10^14.5 Poise), below which even microscopic internal flow effectively stops and annealing stops with it. It then is safe to cool the

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