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  • For the preparation of the glass according to the invention the preferable procedure is to melt suitable starting materials, such as e.g. carbonates, oxides and fluorides, at a temperature in the range of 1350??? C. to 1650??? C., preferably 1400??? C. to 1600??? C., over a period of time of 30 minutes to 4 hours, preferably 1 hour to 2.5 hours, with formation of a homogenous melt.
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