Sandwich plate system

Not to be confused with Sandwich panel.

Sandwich Plate System (SPS) is the name of a patented structural composite material. It offers an alternative to traditional stiffened steel and reinforced concrete in various heavy engineering projects. An SPS element typically consists of two metal face plates (usually steel, but can also be high tensile steel, stainless steel, or aluminium) bonded together by a solid, continuous core of polyurethane elastomer. This elastomer core is injected as a two-part thermosetting liquid into the cavity between the metal plates, which solidifies to create a strong bond.

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