Polypropylene combines high corrosion resistance, high temperature resistance (Melting point is 320°F), and great tensile strength.
It maintains its stiffness at elevated temperatures and displays incredible resistance to organic solvents, degreasing agents, and electrolytic attack. In addition, the material is lightweight, and stain and moisture resistant.
Because of the incredible chemical resistance, Polypropylene can not be bonded or glued together. Polypropylene must be hot welded or the use of sonic welding to attach pieces together. This process, while outside of the norm, is quite common for the polyolefin family of plastics. The other polyolefin material with the same welding requirements is Polyethylene. FRP-3 is a specialty type of fire resistant polypropylene.