This market and technical analysis of Wood-Plastic Composites (WPCs), basically consists of two parts. Part one focuses on current markets and expected market trends, a listing of WPC manufacturers, state of the art product portfolio and prod-uct trends for WPCs in Europe and North America. Part two shows the technical performance of three commercialized WPCs for outdoor decking use versus com-modity plastics and selected types of wood. This comparison is based on the key engineering properties density, flexural modulus of elasticity, flexural strength and water absorption after immersion in water for 24 hours. Furthermore a ranking of materials regarding the properties stiffness at low density and stiffness at low cost is given by the use of material indices.