The main component of PVC is polyvinyl chloride, which is yellowish translucent and lustrous. Transparency is better than polyethylene and polypropylene, but worse than polystyrene. With the different dosage of additives, it can be divided into soft and hard polyvinyl chloride. Soft products are flexible and flexible, and feel sticky. Hardness of hard products is higher than that of low density polyethylene, while lower than that of polypropylene, whitening will occur at the bending point.