Semi-welded plate heat exchangers are used for handling aggressive media, such as ammonia and other refrigerants, which cannot be readily sealed by conventional elastomer gaskets.

Individual plate cassettes, which consist of two plates laser welded together, are installed as a plate pack inside of a frame. Each adjacent pair of cassettes is fitted with a specially designed port gasket to isolate the aggressive media from contact with the utility media. This arrangement confines the aggressive media inside a welded channel with minimum exposure to gasketing.

Plate Concepts semi-welded plate exchangers are available in stainless steel and titanium. Gasketing includes NBR, EPDM and chloroprene and Teflon.