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Hollow glass industry

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Glass is heated for processing. Contact points with other materials arise in the production process wherever hot glass is cast, moulded, held or conveyed. Tongs, slides or deflectors, mandrels and guides are therefore utilised at the hot end when handling hollow glass products. These are required to withstand the high temperatures involved for as long as possible and without altering their characteristics. They also should not bear any impurities and not scratch or damage the surface of the glass, despite the high wear stress involved. Heat dissipation in glass should also be prevented from occurring over materials in an uncontrolled manner, as even minimal differences in the temperature profile can seriously disrupt the production process.

Graphite conforms perfectly to these characteristics. The risk of cracks caused by tension occurring is considerably lower, due to the low thermal conductivity when compared to metals. Less heat is also dissipated from the glass. This has also led to a considerable limitation in the use of asbestos in recent years. Adherences need not be feared, due to the positive chemical resistance, and good temperature resistance ensures that wear is minimised. In addition to graphite materials, CFC composite materials can also be recommended for components subject to severe mechanical stress. Resistance to oxidation can be enhanced by coatings of pyrocarbon or silicon carbide.

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