The firing temperature of the German and French bodies in our product range is in the range of 1200-1250 ºC; accordingly, they are considered as soft porcelain (vitreous china). Unlike regular hard porcelain the firing of vitreous china needs no reductive atmosphere, therefore they can be fired in electric furnaces as well. The porosity and mechanical strength of the fired objects are nearly as high as those of conventional hard porcelain products. Some types (e.g. PM 402, PC 975) contain a minor amount of cobalt colouring material, resulting in fired china of blueish-white hue. The masses are produced by spray drying. They already contain all or some of the liquefying agent.