Glass & Oxides

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2 3 3 Template verre 2 GLASS-FIVES Fives in Induction

Some oxides and salts have thermal and electrical insulating properties at room temperature and become conducive at high temperatures. Due to ionic conduction, the electrical resistance of oxides (1-10 Ω.cm at 1,500°C) means they can be heated and melted by induction. 

Because they have weak thermal conduction at low temperatures and their resistivity decreases as the temperature goes down, the self-crucible direct induction technique can be applied using an equal skin depth to radius of load ratio.

A self-crucible is when a melt is kept inside an insulating shell (gangue) made of the same solid material to be melted. The bath can reach temperatures of 2,500°C without any contact between the bath and the inductor (no product contamination). 

There are various startup techniques:

  • Radiant load
  • Gas burner
  • Inductive load

Self-crucible direct induction melting is an ideal solution for continuous or batch melting processes with overflow or bottom tapping (induction spout). 

This high-performance technology is industry-ready, flexible and can effectively be used to melt a wide range of workpieces with excellent energy efficiency. 


• Crystal melting

• Special or technical glass melting

• Refractory oxide melting, developing phosphates

• Waste vitrification (residue from fume purification of household waste incineration, asbestos, etc.).


  • High melting temperatures above 2,500°C 
  • Maximum energy efficiency (1-1.5 kWh/kg of glass cast)
  • Low maintenance, no wearing parts
  • Easily adjustable
  • Wide use range (50-1,000 kg/production hour) with inductive powers of 100-2,000 kW
  • Good thermal consistency for bath (no hot points and includes a cold roof)
  • Flexible enough for production changes (load changes) 




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