The PET foam board is a closed cell thermoplastic renewable polymer foam. It has excellent fire protection, smoke prevention and anti-virus properties. Excellent mechanical and fatigue resistance, chemical stability, UV protection, low water absorption. Under high temperature and post curing conditions, the chemical properties are stable, no post expansion, and its mechanical properties are greatly enhanced. It is suitable for all resins and processing technologies, especially the shear elongation has been improved unprecedentedly. Pet foam board can be used as sandwich materials in wind turbine blades, rail transit, ships, building materials, decoration materials and industrial applications.