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Barro, Hierro & Cristal
Glas
In order to make glass, a blend of
silicon dioxide, boroxide, sodium oxide, potassium oxide and aluminium oxide is
melted in basins heated electrically or with gas to a temperature of
approximately 1,650 °C. Glass receives its final form in moulds made of steel on
rotating, air-blowing machines. After 12 to 24 forming steps, it finally reaches
the cooling down process. The results are symmetrical, unstressed glass bodies,
which can be used as glasses or containers.