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Glass or glass ceramic glazing, hanging or decorative glass composition containing no lead and cadmium, and method for producing glass ceramic coated with the glass composition
Glass or glass ceramic glazing, hanging or decorative glass composition containing no lead and cadmium, and method for producing glass ceramic coated with the glass composition
A lead- and cadmium-free borosilicate glass, having a specified composition and having a low thermal expansion coefficient, is new. A low thermal expansion coefficient lead- and cadmium-free glass, for glass coating, enameling and decorating glasses or glass-ceramics, has the composition (by wt.) 0-6 % Li2O, 0-5 % Na2O, 0 to less than 2 % K2O, 2-12 % Li2O + Na2O + K2O, 0-4 % MgO, 0-4 % CaO, 0-4 % SrO, 0-1 % BaO, 0-4% ZnO, 3 to less than 10 % Al2O3, 13-23 % B2O3, 50-65 % SiO2, 0-4 % TiO2, 0-4 % ZrO2, 0-4 % F (substituting for oxygen) and up to 30 % firing temperature resistant pigment. An Independent claim is also included for processes for producing a glass-ceramic which is coated, enameled and decorated with the above glass.
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