This work is a continuation and refinement of a general model developed at the Separations Research Program at The University of Texas at Austin (SRP II model) for the prediction of the height equivalent to a theoretical plate and pressure drop for distillation columns filled with metallic structured packings. It contains three parts. In the first part, the general model is briefly described and the participating equations are summarized. In the main part, the parameters needed for applying the general model for structured packings made of ceramic and plastic are presented and discussed. In the third part, we try to correct the model in order to get good predictions at low and high pressures.