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Thin glass has increased problems in a tempering process. Thinner glass needs a higher temperature and higher heat transfer coefficient to get tempered glass. At the same time, bending stiffness of glass plate decreases and the possibility of faults in visual quality increases. Numerical modeling is needed to understand how different tempering parameters and support of glass affect tempering and visual quality. In the paper, the reasons for higher temperature and higher heat transfer coefficients for thin glass are shown. The traditional way of supporting glass with rollers is studied and the effect of different parameters on deformations is shown.