Ceramics-Silikáty 37, (2) 105 - 108 (1993)

The regression model of temperature and composition dependence of glass viscosity was developed by nonlinear regression analysis. A minimalisation of weighted sum of squared deviations included 753 viscosity points from 257 compositions of industrially produced container glasses. The temperature dependence of viscosity was described by Fulcher's equation with free volume theory term. The composition dependence of coefficients A, B, T₀ was expressed by linear polynomials of mole fractions of oxides MgO, CaO, Al₂O₃, Na₂O and K₂O. The statistical methods were used to verify the reliability of the proposed model. Practical use of the regression model was shown by the calculation of glass composition with required values of viscosity curve.