The main component of plastic is synthetic resin. Synthetic resin determines the properties of plastic, but synthetic resin is not the same as plastic, it is just a primitive "polymer". To become a high-quality and low-cost plastic, the following materials must be added to the synthetic resin: fillers to increase the strength of the plastic, plasticizers to increase the plasticity and softness of the plastic, stabilizers to prevent the decomposition of the synthetic resin, and coloring of the plastic. Agents, lubricants that make plastic surfaces smooth, and antioxidants that prevent plastics from oxidizing and cracking. After these substances are mixed and processed to a certain extent, plastic is obtained.

The main component of plastic is resin. Resin refers to a polymer compound that has not been mixed with various additives. The term resin was originally named after the lipids secreted by animals and plants, such as rosin, shellac, etc. Resin accounts for approximately 40% to 100% of the total weight of plastic. The basic properties of plastics are mainly determined by the nature of the resin, but additives also play an important role. Some plastics are basically composed of synthetic resins with no or less additives, such as plexiglass.