PVC (Polyvinylchlorid) pipe is a synthetic material formed by extruding polyvinyl chloride resin with stabilizers, lubricants, etc. through a hot pressing process. As the second largest synthetic material used globally, it is mainly divided into three types: PVC-U pipe, PVC-M pipe and PVC-O pipe. The melting temperature range is 185~205℃. The hard PVC pipe accounts for approximately two-thirds, featuring corrosion resistance and low price, it is suitable for drainage, water supply and chemical fluid transportation.