Thermal stress can impair the mechanical and thermal resistance of glass. This results in the glass mat likely breaking during chilling, storage, transportation, and usage. To avoid this, glass goods must be annealed once they are formed. Annealing is a process of heat treatment in which the glass is heated to a given temperature range and then held or cooled slowly for a considerable amount of time. This process assists in eliminating the need to reheat the glass in the event its thermal stress levels are high or lowering them to allow tolerance to improve the quality of the glass.
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