Centrifugal pumps designed for corrosive fluids, suitable for crystallizing liquids or those with suspended solids. Constructed with an external casing in cast iron, internal volute, and impeller made of PVDF, polypropylene, Teflon-PFA, or Teflon-FEP. Some smaller models feature an integral non-metallic casing. Available with single or double mechanical seals, equipped with a dry spring and connections for vapor quenching or external flushing. Fitted with a thermosiphon system for double seal versions. Semi-open impeller and stainless-steel shaft with a non-metallic sleeve.