Polyethylene and Polypropylene are thermoplastic polymers made by the chemical industry and used in a wide variety of applications, including packaging, textiles (e.g. ropes, thermal underwear and carpets,woven bages), stationery, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, automotive components, and polymer banknotes.

Polyethylene is the most widely used plastic, classified into several different categories based mostly on its density and branching, such as
HDPE, used in products and packaging such as milk jugs, detergent bottles, margarine tubs, garbage containers and water pipes.
LDPE, used for both rigid containers and plastic film applications such as plastic bags and film wrap.
LLDPE, used predominantly in film applications due to its toughness, flexibility and relative transparency, and is used in packaging, particularly film for bags and sheets, Cable covering, toys, lids, buckets, containers and pipe.Lower thickness may be used compared to LDPE.

Polypropylene PP is normally tough and flexible.Most commercial polypropylene is isotactic and has an intermediate level of crystallinity between that of low density polyethylene (LDPE) and high density polyethylene (HDPE)

Polystyrene and Polyster are also other well known and demanded polymers.