SIGMATWIN corrugation

The SIGMATWIN double-wall plate heat exchanger has been specifically designed to meet specific requirements for a heat exchanger as a safety plate.

Contruction and Functional Concept

Instead of a single SIGMA plate we apply a SIGMATWIN plate pair, which has been moulded together and put into each other. The sealing of the gap is realised with flat ring gaskets or laser welded.

This prevents a contamination of the two fluids / products which are engaged in the heat exchange process in the event of a leakage. A leakage escapes into the gap between the two plates and can be seen during an inspection.

SIGMA plate heat exchangers equipped with SIGMATWIN double-wall plates can be opened like standard plate heat exchangers for inspection, or maintenance purposes.


  • Applicable for volume flow rates up to 320 m3/h
  • Plate thickness of the SIGMATWIN double-wall plates
  • 2 x 0,3 mm           or            2 x 0,4 mm
  • Stainless steel 1.4404 and others
  • Elastomer gaskets NBR / EPDM (FDA-compliant)

SigmaTwin Series Numbers

  • SIGMATWIN ​​​​​​​M37 DW
  • SIGMATWIN ​​​​​​​M66 DW
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