Schott Ag

Arne Riecke

Markus Ollig

Ulrich Lange

Rainer Erwin Eichholz

Andreas Langsdorf

Ulrich Fotheringham

Volker Trinks

Stephan Tratzky

Peter Naß

Susanne Krüger

Thomas Lenz

Christoph Gross

Fabian Etzold

Wolfgang Wallat

Reinhard Gmeiner

Wassilis Bagaris

Rainer Schmid

Sebastian Stark

Detlef Köpsel

A glass tube, such as a glass tube for the production of containers for storage of pharmaceutical compositions, facilitates production of pharmaceutical containers with high quality. The glass tube has a relative cross-sectional area deviation defined as is less than k*x+t. QFis the highest cross-sectional area and QFis the lowest cross-sectional area of at least two cross-sections of the glass tube, the cross-sections being spaced apart from each other along a length of the glass tube, and k is 0.0023 m, t is less than 0.15 mm/m and x is

Glass tube

An apparatus for forming glass tubes is provided. The apparatus includes a Danner-pipe, a heating device, and a heating chamber having the Danner-pipe and the heating device arranged therein. The Danner-pipe is inclined with respect to a horizontal plane by a Danner-angle. The heating device is inclined with respect to the horizontal plane by a heating-angle. The Danner-angle and/or the heating angle are in a range of 1° to 45°.

Apparatus for forming glass tubes, a heating chamber and a process for the manufacture of an apparatus for forming glass tubes

The invention relates to glass articles, such as for example glass tubes or flat glasses, where the material at the surface by a targeted process control has gradient material properties which in turn result in a compressive prestress of the surface. The invention also relates to a method for the production of the glass articles as well as their use.

Prestress by use of a gradient material

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Waldsassen, Germany

Arne Riecke