Replacing Metals with PEEK: An Interview with John Walling at Victrex plc.

The inherent low specific gravity of VICTREX PEEK (1.3 g/cm3) is less than half that of aluminium and one sixth that of steel. Carbon or glass fibers are added as structural reinforcements in PEEK compounds that have high strength and modulus properties similar to aluminium, but still much lower in density. This results in a superior strength-to-weight ratio so VICTREX PEEK-based compounds can offer equivalent strength and stiffness with up to 70% weight reduction.