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drops to 10¹³ Poise (10¹³ dyne-second/cm²). For most kinds of glass, this annealing temperature is in the range of 454 - 482 C, and is the so-called stress-relief point or annealing point of the glass. At such a viscosity, the glass is still too hard for significant external deformation without breaking, but it is soft enough to relax internal strains

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