Schott Ag

Wolfgang Zettl

Stephan Tratzky

Erhard Dick

Johann Collignon

The glass-metal bond for a tube collector includes a glass tube and metal part bonded to the glass tube. In order to match the thermal expansion properties, the glass tube has the following composition: SiO, 73-77 wt. %; BO, 6-&#x3c;8 wt. %; AlO, 6-6.5 wt. %; NaO, 5.5-7 wt. %; KO, 1-3 wt. %; CaO, 0.5-3.2 wt. %; MgO, 0-2 wt. %; FeO, 50-150 ppm; and TiO0-&#x3c;100 ppm. The ratio of the sum of the alkaline-earth metal oxides (in mol %) to the sum of the alkali metal oxides (in mol %) is &#x2266;0.6. The metal part is preferably made of metal material no. 1.3981 according to DIN 17745. The glass composition itself is also part of the invention.

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Mitterteich, Germany

Wolfgang Zettl