Dicyclopentadiene (DCPC) is a dimer of cyclopentadiene. Cyclopentadiene is first heated to copolymerize into dicyclopentadiene, and dicyclopentadiene is separated from other light components (boiling point <45°C) by distillation, and then other required dienes, monoolefins and saturated hydrocarbon components are separated by solvent extraction. High-purity dicyclopentadiene is a colorless crystal at room temperature. When it contains impurities, it is a light yellow oily liquid with a pungent camphor smell. It is insoluble in water, but soluble in organic solvents such as alcohol and ether.