PP, or polypropylene, is a thermoplastic polymer made from the propylene monomer. Resistant to acids bases, and solvents, PP is used to make textiles, stationery, car parts, packaging materials, and reusable containers. HDPE stands for high-density polyethylene. This polyethylene thermoplastic is made when intense heat is applied to petroleum. HDPE is used in various applications like wood-plastic composites, composite wood, in landfills as cell lining, plastic surgery applications, and natural gas pipes.
Polypropylene plastic is a strong and rigid material that can effectively retain its strength across a variety of different applications. In fact, polypropylene plastic is so strong, that pound-for-pound, products made from the material are on average, three times stronger than those made with steel.