HDPE
Thermoplastic polymer produced from the monomer ethylene.
Its main advantages are stiffness and strength. It is resistant to impact, tension, and both high and low temperatures. It is not attacked by acids or solvents. It is colorless and almost opaque.
Common uses: pipes, bottles, jugs, caps for medicines and cosmetics, and even furniture.
Its Plastic Identification Code for recycling is 2.