C9 cold polymerized petroleum resin is a petroleum resin synthesized by cracking C9 raw material and forming carbon positive ion active center under the action of catalyst to trigger chain polymerization, which is not a polymer, but an oligomer with molecular weight between 300-3000. C9 cold polymerized petroleum resin is not used alone, but used as accelerator, modifier, and other resins together. C9 cold polymerized petroleum resin should be stored indoors at an ambient temperature of not more than 35℃ and relative humidity of not more than 85%. The product can be transported by car, ship or train. Pay attention to fire prevention, sun protection, rain protection and hand hook protection, and the packaging should use 25kg multi-layer composite paper bags, or large bags with net weight of 500kg or 1000kg.