Dicyclopentadiene, aka DCPD or C10H12, is an artificial chemical compound used in a closed mold process. DCPD resin is characterized by its low viscosity and its resistance to heat, impact, and corrosive chemicals. Parts made of DCPD allows them to be large, strong, and lightweight and are thus used in applications like: protective coverings, shields, hoods as well as the outer bodies of cars, trucks and machinery.