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Our recently developed model for the viscosity of silicate melts is extended to describe and predict the viscosities of oxide melts containing boron. The model requires three adjustable parameters to reproduce the viscosity of B 2 O 3 –SiO 2  melts and two parameters for each B 2 O 3 – M O   x   melt, where  M O  x   is a basic oxide other than an alkali oxide. All available experimental data have been collected for binary melts formed by B 2 O 3  with SiO 2 , Al 2 O 3 , CaO, MgO, ZnO, PbO to calibrate the model. The viscosities of the B 2 O 3 -containing ternary and higher-order subsystems of the B 2 O 3 –CaO–MgO–PbO–ZnO–SiO 2  system and of the B 2 O 3 –CaO–MgO–PbO–ZnO–Al 2 O 3  system are then predicted by the model without any additional adjustable parameters. Experimental data were found for only five such subsystems: B 2 O 3 –PbO–SiO 2 , B 2 O 3 –CaO–SiO 2 , B 2 O 3 –PbO–ZnO, B 2 O 3 –PbO–Al 2 O 3  and B 2 O 3 –CaO–Al 2 O 3 . Predictions of the model are compared to these experimental data.

A model to calculate the viscosity of silicate melts: Part IV: Alkali-free borosilicate melts