Norbornene by Topas Advanced Polymers (Polyplastics) is bicyclo-[2.2.1] heptane (Synonyms: 2-Norbornylene, 2-Norbornene and Norcamphene). It is made by the Diels-Alder reaction of cyclopentadiene and ethylene, two readily available hydrocarbons. The resulting molecule, a bicyclic olefin, is a bridged six-membered ring with a double bond on one side. Used in high-damping rubber and in the manufacture of COC polymers. It is listed in EINECS Number 207-866-0, SWISS Number G-4815, TSCA, NDSL, AICS, ENCS Number 4-1763 (MITI) and PICCS. Norbornene is used in adhesive bonding applications, gaskets and seals.