What Is Polypropylene

Polypropylene, referred to as PP, is a polymer made of propylene through the addition polymerization reaction. It is a white waxy material with a transparent and light appearance . The chemical formula is (C3H6)n, the density is 0.89~0.91g/cm3,  It is flammable, the melting point is 164~170℃,  It softens at about 155℃, and the use temperature range is -30~140℃  . It can resist the corrosion of acids, alkalis, salt liquids and various organic solvents below 80℃, and can decompose under high temperature and oxidation. Polypropylene is a thermoplastic synthetic resin with excellent properties. It is a colorless, translucent thermoplastic lightweight general-purpose plastic with chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high-wear resistance processing properties. [5], widely used in the production of clothing, blankets and other fiber products, medical equipment, automobiles, bicycles, parts, transportation pipelines, chemical containers, etc., and also used in food and pharmaceutical packaging. 
On October 27, 2017, the World Health Organization's International Agency for Research on Cancer released a preliminary reference list of carcinogens. Polypropylene is included in the list of Class 3 carcinogens.