Polypropylene (PP) has a density between 0.895 and 0.92 g/cm³. PP is normally tough and flexible, especially when copolymerized with ethylene, allowing PP to be used as an engineering plastic. Furthermore, PP is known to have good fatigue resistance. The melting point occurs at a range from 130 to 171 °C. PP can be used for a wide variety of applications such as packaging and labeling, textiles, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers and automotive components.