For the concentration of solutions containing substances with high corrosive potential, such as hydrochloric acid or hydrofluoric acid, which are not compatible with the special materials (e.g. SUPER DUPLEX SAF 2507) used in the construction of our plants, IWE can produce vacuum evaporators with heat exchangers in GRAPHITE or SILICON CARBIDE and with boiling boilers enamelled or internally coated with fluorocarbon resin (Halar® ECTFE).