Limit molecular formulas and target formulas determination for feldspar porcelain glazes

The paper is with a view to glazes designed for industrial glost fast firing of feldspar porcelain. In this case, limit “molecular” formulas have to assure a transparent glaze obtaining, for glost fast firing (10 °C/min, 5 h from cold to cold) at maximum temperature, in range between 1360 and 1390 °C, what is realised through the entire “molecular” formulas balancing. There were settled limit “molecular” formulas and guidelines for feldspar porcelain glazes, starting from a relative large number of working recipes developed by feldspar porcelain industry, each oxide range has been rationalised. Target formulas reveal oxides categories and variation range of each oxide to produce a transparent feldspar porcelain glaze.