There are various ways to classify plastics:
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Classified by usage characteristics: divided into general plastics, engineering plastics, and specialty plastics.
Universal plastics: with large production volume, low price, and wide applications, such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), etc.
Engineering plastics: can be used as engineering materials and as a substitute for metal in manufacturing machine parts, such as polyimide, polyphenylene sulfide, polysulfone, etc.
Special plastics: It has special functions and is used in aviation, aerospace and other special applications, such as reinforced plastics and foam plastics.
Classified by aggregation method: divided into additive plastics and condensed plastics.
Additive polymerization plastics: produced through addition polymerization reactions, such as polyethylene (PE), polypropylene (PP), polystyrene (PS), etc.
Classified by structural characteristics: divided into linear polymer plastics, branched polymer plastics, and cross-linked polymer plastics.
Classified by thermal performance: divided into thermoplastic and thermosetting plastics.
Thermoplastic: Plastic that can be repeatedly heated to soften and cooled to harden, and can be recycled, such as ABS, PP, POM, PC, PS, PVC, etc.
Thermosetting plastics: substances that become non melting when heated and cannot be recycled, such as phenolic resins, epoxy resins, etc.
Other classification methods include classification based on crystal morphology, translucency, hardness, etc.