WPC boards show good set of performance but monolithic composite sheets are relatively heavy (most often heavier than pure plastics) which limits their use to applications where low weight is not enssential. WPC in a sandwich-structured composite form allow for combination of benifits of technology. WPC sandwich boards consist of wood polymer composite skins and usually low density polymer core which leads to a very effective increase of panel's rigidity. Wpc sandwich boards are used mainly in automotive, transportation and building applications, but furniture applications are also being developed. New efficient and often in-line integrated production proccesses allow to produce stronger and stiffer WPC sandwich boards at lower costs compared to traditional plastic sheets or monolithic WPC panel.