Carboxymethlycellulose used in ceramic glazes Part III: Influence of CMC characteristics on glaze slip and consolidated glaze layer properties

In the third part of this study, glaze slips were prepared with CMCs having different molecular mass and/or degrees of substitution. Raising the molec ular mass or lowering the degree of substitution increased the viscosity of the slip. Rheological behaviour was also found to change from dilatant to pseudoplastic behaviour as the CMC concentration increased. The glaze slips were applied to porous tile bodies, and the resulting consolidated glaze l aver was characterised. The results showed that the CMCs with the highest m olecular mass needed longer surface drying times, while exhibiting better c ohesion and bonding to the body. The opposite tendency was found for the de gree of substitution. Depending on glaze requirements, different types of C MCs are used in industry, dictated by the process and type of product invol ved. The effect of CMC molecular mass and degree of substitution was quanti fied in the study. The data were used to produce glazes whose characteristi cs satisfactorily meet pre-set requirements.