The raw materials are delivered in powder form and stored in silos.
Batch mixing is fully automated and uses precise scales as well as automatically controlled conveying and mixing devices. This ensures that errors in the composition can be excluded. DURAN® cullet is added to powdered raw material. This batch is then fed to the melting unit (tank).

The melting process is the main phase in glass production. The batch is melted at a temperature of some 1,600 °C. The glass melting units are electrically heated and continuously operated. Next the liquid glass is manually or mechanically further processed.

There are a wide range of precision finishing processes for DURAN® glass, amongst which blowing, pressing and the press and blow process are used in particular in the production of hollow glassware:

Dependent on geometry and batch size, the blowing of hollow glass can be carried out manually by a glass maker or automatically by blowing machines. Here liquid glass is blown into a mould.
For example, beakers or coffee jugs are produced using this process.

A further important manufacturing process is the pressing of DURAN® glass. Liquid glass is formed into the desired geometry using a plunger and mould. For example desiccator bases are manufactured in this way.