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Spotlight

Water-glass binders for casting ship propellers

Industrialisation and globalisation are driving a steady increase in the volume of goods traversing the seven seas. Growth in sea freight, combined with the rise in popularity of passenger cruises, has boosted demand for seawater-resistant castings, from ship propellers to pump and valve housings. 

Ship propellers, for example, are extremely high-value castings which are made of high-quality alloys (bronze). Impeccable casting is therefore of the essence here.
A tried-and-tested moulding and core manufacturing methods for ship components is the polyurethane-isocyanate or Pentex® process.

The Zollern GmbH foundry relies on the Pentex® process from HA for the production of ship components. Here are the benefits of the process at a glance:

  • Short curing times despite a relatively long processability time
  • Low binder addition levels
  • Unsurpassed flowability
  • Smooth, firm mouldings
  • Good mould release
  • Low odour

Water-glass ester process for ship propellers

Due to the specially curved geometry of ship propellers, demoulding presents a challenge.

This is precisely where a water-glass binder with a special module comes into its own. Because this develops its highest strength slowly, the model can be demoulded while the mould is still “soft”.

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