Polypropylene, abbreviated as PP, is a polymer formed by the addition reaction of propylene. It is a white waxy material with a transparent and lightweight appearance. The chemical formula is (C3H6) n, with a density of 0.89-0.91g/cm3. [1] It is flammable and has a melting point of 164-170 ℃. [17] It softens at around 155 ℃ and can be used at temperatures ranging from -30 to 140 ℃. It can withstand corrosion from acids, alkalis, salt solutions, and various organic solvents below 80 ℃, and can decompose under high temperature and oxidation.
