Plastic is a material made of synthetic or natural organic polymers that are shaped or molded to be able to maintain a certain form under different conditions. Plastic is widely used in daily life and industrial manufacturing because it is lightweight, durable and malleable.

       The main characteristics of plastic:
Lightweight: Plastic is lighter than materials such as metal and glass, so it is widely used to reduce the weight of products.
Plasticity: Under certain temperature and pressure, plastics can be processed into various shapes.
Corrosion resistance: most plastics have good corrosion resistance to water, acids, alkalis and other substances.
Insulation: plastics have good electrical insulation properties and are suitable for electrical and electronic equipment.
Easy to process: they can be mass-produced by injection molding, extrusion, compression and other processes.

      Classification of plastics：

 Plastics are usually classified into two categories based on their chemical composition and processing methods:

      Thermoplastics: These plastics can be softened by heating, hardened by cooling, and reused many times. Common thermoplastics include polyethylene (PE), polypropylene (PP), polybutylene terephthalate (PBT), polyoxymethylene (POM), and polyamide (PA).

      Application of plastics:
Plastics are used in a wide range of applications, covering almost all industries. For example:

Packaging materials: food, daily chemical packaging (such as plastic bags, cling film)
Building materials: PVC pipes, plastic window frames
Electronic and electrical appliances: insulation for wires and cables, housing for electronic products
Automotive industry: lightweight parts
Medical: syringes, medical device housings.

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