Polypropylene, also known as PP or polypropene, is a polyolefin or saturated polymer. It is a low-density thermoplastic with good resistance to heat. Other characteristics of PP include: chemical resistance, elasticity, toughness, fatigue resistance, and electrical insulation capability. 

Carbon fiber reinforced composite (CFRP) is composed of carbon fiber as a reinforcement material and resin as a matrix material, and early carbon fiber composite materials are mainly used in the military field. With the improvement of material properties, molding process and price cost, carbon fiber composite materials are more and more used in general industry and sports and leisure fields.