1) Composite material 
Royalex is a composite material, comprising an outer layer of vinyl and hard acrylonitrile butadiene styrene plastic (ABS) and an inner layer of ABS foam. The layers are bonded by heat treatment. It is used for manufacture of durable, mid-priced canoes. ==Development== Royalex was developed by Uniroyal in the 1970s. In 2000 the Spartech Corporatio...