Long term durability constructions of the glass

The durability of glass can be witnessed in most cities with ancient churches.  Unless broken by excessive loads glass will remain for very long periods.  The glass may be pitted by the weather but still it provides service through the centuries of use.  The early producers of glass treated the production like alchemy but modern glass is fairly uniform and the properties governed to provide consistent performance in use.  Apart from mechanical stress there are only a few factors that damage glass.

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