Tempered glass must have good strength and visual quality. This is achieved with proper heat transfer control during tempering. Measurement of stresses in tempered glass and temperature measurement during the process are difficult but with simulation the effect of the different process parameters which affect the tempering results and deformations can be studied. A detailed understanding of the process helps to increase the quality of the tempered glass and to decrease the energy consumption of the process. In order to understand the tempering process a theoretical knowledge of heat transfer, mechanics and glass behavior is needed. In the paper the theory of residual stresses is presented and its suitability for use in improvement of the process is discussed.
