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In technical glass production, molten glass is pressed and rapidly cools as it is removed from the mold. This rapid cooling creates internal stresses within the glass piece. Annealing is the controlled process of slowly cooling glass to relieve these internal stresses. Kopp's annealing process provides the solution for the elimination of these stresses in technical glass lenses. Kopp develops proprietary annealing schedules for each unique product design to ensure maximum stress removal. Factors influencing these schedules include glass composition, coefficient of thermal expansion and glass thickness.

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