UPVC, also known as PVCU, is usually called rigid polyvinyl chloride. It is an amorphous thermoplastic resin composed of vinyl chloride monomer and some additives (such as stabilizers, lubricants, fillers, etc.). ). UPVC is easy to decompose due to its high melt viscosity, and the decomposed products have corrosive effects on metals, so its injection molding must have special plasticizing parts and temperature control system.

PE double-walled corrugated pipe is a new type of lightweight pipe made of polyethylene by extrusion and special molding process, with smooth inner wall and corrugated outer wall.