C5-F(A123) is an aliphatic hydrocarbon resin which applicable for Rubber Compounding. Which don’t contain arene, which have good compatibility with synthetic rubber of various kinds, polyethylene, polypropylene, styrene polymer, EVA, etc. as well as reinforcing resin. In rubber mixing, it is applicable to adhesive, reinforcing agent, filler for its improvement in tensile strength, tensile stretch, anti-avulsion and the ideal auxiliary agent for high-grade soles, rubber products, inner tube, strap and light rubber products.