Definitions for "Annealing Point"
The temperature of about 35 to 40 degrees F. overt the strain point where internal stress in glass is quickly reduced.
Temperature at which stresses are removed.
The temperature at which internal stresses in glass are significantly reduced. In the annealing operation, glass is gradually cooled from above the annealing point temperature to below the strain point temperature. This slow cooling relieves residual thermal stresses that would develop if the glass were allowed to cool in an uncontrolled manner.