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Pillow plate is a metal heat exchanger formed by inflating.

Pillow plates are generally made of two spaced thin steel sheets, (laser) welded to each other. The space between the plates is pressurized to deform one or both plates in order to provide a space in which a heating (or a cooling) medium can circulate. Creating the single or double embossed plates.

Pillow plate can be produced with different metals. Appearance in industry is Stainless steel 80%, Normal steel 10%, Aluminium and Titanium 5% other materials 5%.

Herman Oonk, with his company OMEGA Thermo Products [1], invented the laser welded machines to weld plates together with a spot pattern. He named the welded plates, Pillow Plates. Because Oonk was a pure technician with any interest in marketing, he never registered the name Pillow Plate. Other companies also began to manufacture Pillow Plates and used the name. Nowadays pillowplate or pillow plate is a general term.