Abstract: The advantages and disadvantages of PET,PVC and PMI as sandwich foams for wind turbine blades are compared from the static mechanical properties,fatigue properties,water absorption,resin absorption,heat resistance,safety,environmental protection,flame retardancy,combustion smoke concentration,toxicity and price,which provides a direction for the selection of sandwich foam for wind turbine blades.

Key words: wind turbine blade, sandwich foam, PET, PVC, PMI