Fluorine-containing lead- and cadmium-free glazes

Details Fluorine-containing lead- and cadmium-free glazes Fluorine-containing lead- and cadmium-free glazes

C - Chemistry, Metallurgy

03

C

C03C 8/02 (2006.01) C03C 3/118 (2006.01) C03C 8/06 (2006.01)

Patent

CA 2141378

This invention is directed to a glass frit composition essentially free from lead and cadmium exhibiting a linear coefficient of thermal expansion (25°C-300°C) between about 75-85 × 10-7 /°C, good flow at temperatures between about 950°- 1000°C, a softening point between about 650°-725°C, and excellent resistance to attack by alkaline detergent and hydrochloric acid, said frit consisting essentially, expressed in terms of weight percent on the oxide basis (except for the fluorine content), of SiO2 49-55 MgO 0-2 B2O3 13-20 CaO 1-7 Al2O3 4.5-7 SrO 0-8 Na2O 5-8.5 BaO 0-11 K2O 5-8.5 ZnO 0-2 Na2O+K2O 11-16 F 0. 25-3.

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