Why can WPC doors be waterproof?

The molecular-grade resin powder contained in WPC door, after high-temperature foaming, completely wraps the wood powder to isolate water molecules. The water absorption rate of wood is about 12%, and the water absorption rate of WPC doors is less than 1%. Basically does not absorb water. The water absorption rate of BLOSSOM CHEER's WPC door is 0.3%, which is absolutely waterproof, and can even be used directly in water for a long time.