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Fascination Glass

A valuable shell

The functional, distinct and versatile glass packaging can – against the background of saving the environment – be entirely recycled and therefore be reused preserving natural resources. Glass containers protect the environment the climate and health. Source: http://www.petzi-kristall.de/Glasherstellung/glasherstellung.htm Raw materials needed for glass production Glass is mostly made up of quartz sand. Only fine-grained, purely white noble sands are used in the process of producing glass that are as free from any contamination as possible. In Germany, these quartz sands can predominantly be found in the Weser-Elbe region, in the Cologne Lowland and Saxony. The quartz sand is melted; the melting point being somewhere between 1.700°C and 1.800°C. However, the usual melting temperature inside the glass furnace is approximately only 1.450°C. To liquefy the glass under these conditions sodium carbonate, potassium carbonate, dolostone and feldspar are put to use as so-called melter. Sodium carbonate and potassium carbonate are produced industrially. Lime stabilizes the glass. It provides hardness, shine and durability. Lime exists naturally in many German regions. For the glass production, the lime has to be cleaned and ground. Source: http://www.bvglas.de/der-werkstoff/glasbestandteile/ Glass melt Glass is formed by combining the raw materials quartz sand, sodium carbonate or potassium carbonate and lime while exposing them to high temperatures. The resulting mass solidifies during the cooling down process without crystallizing. Depending on the preferred properties of the future glass product, different recipes are composed. The raw materials are melted under 1.400°C in the glass furnace. The melting process requires a lot of heat. After further heat input, the full melting temperature lies between 1.400°C and 1.500°C. Upon completion of the melt, the mass' high temperature and viscosity have to decrease until they reach working temperature and the state necessary for treatment.
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