Glass is heat-treated by heating annealed glass to a temperature of approximately 1,150ºF (621°C), then rapidly cooling it. The glass is cooled by a carefully controlled airflow (also known as quenching), which uniformly cools all glass surfaces simultaneously. High airflow rates produce tempered glass and much lower airflow rates produce heat-strengthened glass.
Heat-treated. Fully Tempered Glass
Glass is heat-treated by heating annealed glass to a temperature of approximately 1,150ºF (621°C), then rapidly cooling it. The glass is cooled by a carefully controlled airflow (also known as quenching), which uniformly cools all glass surfaces simultaneously. High airflow rates produce tempered glass and much lower airflow rates produce heat-strengthened glass.