A process designed to eliminate or limit the internal stresses of the cooling of glass. Under normal conditions, the surface of glass will cool more rapidly than the center causing internal stresses which may cause the glass sheet to crack, shatter, or even explode. By submitting the glass to controlled cooling in a special oven known as a “lehr”, the glass is allowed to cool to a temperature known as the “annealing point”. When the glass reaches this point, the temperature is stabilized for a specific length of time, to allow stresses in the glass to relax