"Tianhai" EVA (ethylene-vinyl acetate copolymer) waterproof board is produced by domestic advanced two-stage co-extrusion single-screw extrusion method. The raw material resin EVA is added with reinforcing agent, antioxidant, heated and melted, plasticized and extruded. Formed after traction. The product has the characteristics of anti-UV, anti-aging, anti-corrosion, anti-puncture, pollution-free and fast construction.