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KOROZE SKLA A ZACHÁZENÍ S ARCHEOLOGICKÝM SKLEM

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Rohanová D. , Hradecká H. , Kozáková R.

Študijné zvesti

2009

nr 46

163 - 169

Glass is non-crystalline inorganic material with unique optical properties such as transparency. Deterioration of glass (dulling and loss of transparency) is affected by low chemical durability of glass and by adverse effects of an ambient atmosphere. Glass corrosion is caused by diffusion of alkaline ions (Na+, K+) contained in the glass material towards a glass surface. It’s followed by their reaction with the liquid phase (moisture) at the interface. In the case of retention of the alkali products on the glass surface there is a formation of a thin layer with good chemical durability in comparison to the original glass. In the other case it could start total destruction of a glassy network. The corroded layers then step by step delaminate from the glass surface and by reason of an ambient atmosphere it could start a precipitation of alkali silicates, sulphates, carbonates, etc on this surface. This paper is focused on an appropriate treatment of ancient glass, which could be corroded, from the archaeological point of view. Storage of ancient glass needs stabile conditions without sudden changes of temperature or relative humidity (RH).