Plastic is a monomer as raw material, through the polymerization or condensation reaction polymerized polymer compounds (macromolecules), can freely change the composition and body style, by synthetic resins and fillers, plasticizers, stabilizers, lubricants, color and other additives.

The main ingredient of plastic is resin. Resin refers to a polymer compound that has not been mixed with various additives. Resin This noun was first named by the lipids secreted by animals and plants, such as rosin, Shellac and so on. Resins account for about 100% of the total weight of plastic 40%~. The basic properties of plastics are mainly determined by the nature of resins, but additives also play an important role. Some plastics are basically made up of synthetic resins that do not contain or contain less additives, such as plexiglass, polystyrene, etc.