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Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar. Its properties are similar to polyethylene, but it is slightly harder and more heat resistant. It is a white, mechanically rugged material and has a high chemical resistance. Polypropylene is the second-most widely produced commodity plastic (after polyethylene) and it is often used in packaging and labeling. In 2013, the global market for polypropylene was about 55 million tonnes.
PPH
Polypropylene homopolymer
PPC
Polypropylene copolymer
PPR
Random copolymer polypropylene
Polyethylene or polythene is the most common plastic. As of 2017, over 100 million tonnes of polyethylene resins are produced annually, accounting for 34% of the total plastics market. Its primary use is in packaging (plastic bags, plastic films, geomembranes, containers including bottles, etc.).
LDPE
Low density polyethylene
LLDPE
Linear low density polyethylene
HDPE
High density polyethylene
MDPE
Medium density polyethylene