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Plastic is a high molecular compound (macromolecules) made from monomers through polymerization by addition or condensation reactions. Microplastics can harm human health.  Its resistance to deformation is medium, between fiber and rubber, consisting of synthetic resin and fillers, plasticizers, stabilizers, lubricants, pigments and other additives.
The main component of plastic is resin. Resin refers to the high molecular compound that has not yet been mixed with various additives. The term "resin" originated from the resin secreted by plants and animals, such as pine resin and insect resin. Resin accounts for 40% to 100% of the total weight of plastic. The basic properties of plastic are mainly determined by the inherent properties of the resin, but additives also play an important role. Some plastics are basically composed of synthetic resin and contain little or no additives, such as organic glass.
In April 2023, an international research team discovered a new form of plastic pollution: plastic waste film chemically bonded to rocks.