Glas- und Glaskeramikplatten mit erhöhter thermischer Beständigkeit sowie Verfahren zu ihrer Herstellung

摘要

After quenching, glass or glass-ceramic plates produced by conventional methods are subjected to zone tempering. The plate is divided into two zones subjected to different temperatures. The higher temperature is applied to the zone in which in the finished plate - for a particular application of the plate - compr-essive stresses are formed under nonuniform heating.