Polypropylene (Polypropylene, or PP) is a semi-crystalline thermoplastic plastic. High impact resistance, strong mechanical properties, resistance to a variety of organic solvents and acid and alkali corrosion. There are a wide range of applications in industry, including packaging materials and labels, textiles (e.g., ropes, thermal underwear and carpets), stationery, plastic parts and various types of reusable containers, thermoplastic polymer equipment used in laboratories, loudspeakers, automotive parts, and polymer paper money, which is one of the commonly used polymer materials. In 2013, the global market for polypropylene was about 55 million tons.