Glazes Pm – series are matt coloured opaque glazes, based on frits. Within recommended firing limits 960 – 1020 °C they create a noble satin finish because of wollastonite crystallisation from glass saturated by the calcium oxide. The matt effect is not so stable as in case of zinc oxide based glazes and the glazes fired between 1020 and 1100 °C have semi-matt or glossy surface.
The glazes contain no lead, antimony, arsenic, cadmium oxides or any other toxic substances (except Pm 965 91 – Sb, Pb and exceptions marked in % in the chart) and they are suitable for the production of dinnerware and tiles. They are coloured by ceramic pigments where the contained metals are fixed and there is no danger or their getting loose.
The glazes are suitable to be used on white as well as coloured body with the CTE alfa > 65 x 10-7 (K-1), otherwise they craze. All techniques of glazing are to be recommended.