Bayer Aktiengesellschaft

Ferro Corporation

Bayer S.p.a.

Peter Thometzek

Bernhard Freudenberg

Christian Schlegel

Lead-free ceramic frits for producing glazes with intrinsic opacity, and methods of coationg ceramic substrates with the ceramic frits, wherein the ceramic frits have the following composition:

High-gloss ceramic frits

A frit composition for ceramic glazes is disclosed which is free of lead, cadmium and also barium. The composition contains SiO.sub.2, B.sub.2 O.sub.3, Al.sub.2 O.sub.3, alkali metal oxide, CaO, ZnO, and optionally MgO, SrO, TiO.sub.2, Bi.sub.2 O.sub.3, P.sub.2 O.sub.5 or ZrO.sub.2.

Lead-, cadmium- and barium-free frits for ceramic glazes

A ceramic raw material mixture with improved processing properties comprising at least two chemically different raw material components, wherein at least two of the raw material components have the same type of cation on the surface thereof, at least one of the raw material components being coated with said type of cation and the coating, calculated as cation oxide, amounting to 0.01 to 6% by weight, based on the coated component, and all the raw material components having a surface with an isoelectric point of .ltoreq.pH 7.

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Spezzano di Fiorano, Italy

Peter Thometzek