End-piece and plate heat exchanger comprising, and method of making, such end-piece

A plate heat exchanger comprising an end-piece and a package of heat transfer plates, the package of heat transfer plates possessing a first surface,

• the end piece comprising:
• a frame part that is extruded and includes an inner portion, an outer portion and an intermediate portion arranged between the inner and outer portions, an outer wall surface of the inner portion of the frame part facing the first surface of the package of heat transfer plates, the first surface including a center portion and a peripheral portion encircling the center portion, the intermediate portion of the frame part comprising a number of cavities extending in an extrusion direction of the frame part, the extrusion direction being parallel to an axis of the frame part, the outer wall surface of the inner portion possessing outer dimensions at least as large as outer dimensions of the center portion of the first surface of the package of heat transfer plates.