Abstract: A glass-ceramic component is provided that has a low average coefficient of thermal expansion (CTE) and a high CTE homogeneity. The use of such a component and a process for producing such a component are also provided.

Abstract: A glass-ceramic component is provided that has a low average coefficient of thermal expansion (CTE) and a high CTE homogeneity. The use of such a component and a process for producing such a component are also provided.

Abstract: The method measures the thickness of a hot glass body without direct contact with the glass body and is based on chromatic aberration. This method includes focusing a light beam from a light source on the hot glass body using a focusing device immediately after formation; conducting reflected light from the glass body into a spectrometer to obtain a reflected light spectrum; finding two wavelengths of the reflected light from the front side and the rear side of the glass body respectively at which reflected light intensities are maximum; determining the thickness of the glass body from the difference between the two wavelengths; maintaining the focusing device at a temperature below 120° C. during the measuring of the thickness and substantially preventing heat radiation from reaching the focusing device using at least one heat-blocking filter.

Abstract: A borosilicate glass, having a spectral edge wavelength in a UV range of 280 to 325 nm, which can be set in a simple and defined manner, with the composition in percent by weight on an oxide basis of 60–75% SiO2, 10–15% B2O3, 5–15% Na2O, 5–10% K2O, 0–5% Li2O, 0.1–1 CaO, 0.5–3% BaO, >0–1.7% TiO2, 0–0.5% Sb2O3, and normal refining agents.

Abstract: The invention relates to a meltdown device for the production of high-UV transmittive glass types, comprising a meltdown tank for a melt bath a feed opening for the supplying or laying-in of highly pure raw material for the melt bath a draw-off opening for the drawing-off of material melted in the melt tank a cover arranged above the melt tank, in which the infeed opening to the melt tank is arranged above the melt bath in the region of the cover the draw-off opening is arranged in the zone of the bottom of the melt tank a heating arrangement. The heating arrangement comprises heating elements, in particular electrodes that are arranged on the melt tank in the zone of the melt bath, as well as an agitating arrangement for stirring of the melt bath and uniform intermixing and sub-mixing into the melt of material from the mixture lying on the melt surface.

Abstract: The method measures the thickness of a hot glass body without direct contact with the glass body and is based on chromatic aberration. This method includes focusing a light beam from a light source on the hot glass body using a focusing device immediately after formation; conducting reflected light from the glass body into a spectrometer to obtain a reflected light spectrum; finding two wavelengths of the reflected light from the front side and the rear side of the glass body respectively at which reflected light intensities are maximum; determining the thickness of the glass body from the difference between the two wavelengths; maintaining the focusing device at a temperature below 120° C. during the measuring of the thickness and substantially preventing heat radiation from reaching the focusing device using at least one heat-blocking filter.

Abstract: A borosilicate glass, having a spectral edge situation in a UV range of 280 to 325 nm, which can be set in a simple and defined manner, with the composition in percent by weight on an oxide basis of 60-75% SiO2, 10-15% B2O3, 5-15% Na2O, 5-10% K2O, 0-5% Li2O, 0.1-1 CaO, 0.5-3% BaO, >0-1.7% TiO2, 0-0.5% Sb2O3, and normal refining agents.

Abstract: A melting tank with a batch loading channel, with a channel covering having an exhaust gas flue and a loading opening that can be closed by a loading door or flap during operation of the melting tank and the loading opening can be opened for loading the batch. Emissions and service life improvements can be achieved because during operation of the melting tank, a constant air stream is introduced into the loading channel by nozzles in the closed loading door or flap. While loading the batch, the loading door or flap is moved sufficiently far so that the nozzles are moved out of the region of the loading channel, and the loading door or flap covers the region underneath the channel covering with a suction device. A region of the loading opening underneath the channel covering is opened for a loading device.

Abstract: A melting tank with a batch loading channel, with a channel covering having an exhaust gas flue and a loading opening that can be closed by a loading door or flap during operation of the melting tank and the loading opening can be opened for loading the batch. Emissions and service life improvements can be achieved because during operation of the melting tank, a constant air stream is introduced into the loading channel by nozzles in the closed loading door or flap. While loading the batch, the loading door or flap is moved sufficiently far so that the nozzles are moved out of the region of the loading channel, and the loading door or flap covers the region underneath the channel covering with a suction device. A region of the loading opening underneath the channel covering is opened for a loading device.

Abstract: The invention relates to a meltdown device for the production of high-UV transmittive glass types, comprising