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. 2022 Oct 4;12(44):28318–28340. doi: 10.1039/d2ra04713f

Chemical–physical properties, sources, and average quantities produced annually (2020) of the common microplastic wastes.

Plastic class Specific gravity Percentage production Products and typical origin
Polypropylene PP 0.83–0.85 19.7 Food packaging and wrappers, caps, microwave containers, pipes, automotive parts, etc.
Low-density polyethylene PE-LD 0.91–0.93 17.4 Reusable bags and containers, agricultural film, food packaging film, etc.
High-density polyethylene PE-HD 0.94 12.9 Milk bottles, toys, shampoo bottles, houseware, etc.
Poly(vinyl chloride) PVC 1.38 9.6 Window frames, profiles, floor and wall covering, pipes, cable insulation, garden hoses, etc.
Polyethylene terephthalate PET 1.37 8.4 Bottles for water, soft drinks, juices, cleaners, etc.
Polyurethane PUR 1.05–1.28 7.8 Building insulation, pillows and mattresses, insulating foams for fridges, etc.
Polystyrene PS 1.05 6.1 Food packaging, building insulation, electrical and electronic equipment, eyeglasses frames, etc.
Other plastics 7.4 Phenolic resins, epoxide resins, melamine resins, urea resins, etc.
Other thermoplastics 10.7 Hub caps (ABS); optical fibres (PBT); eyeglasses lenses, roofing sheets (PC); touch screens (PMMA); cable coating in telecommunications (PTFE); aerospace components, medical implants, surgical devices, membranes, protective coatings, etc.