A chemical also know as Halon-2402 which has the chemical formula C2F4Br2. It is a known ozone depleting chemical and is listed as a Class I ozone depleting chemical in the United States Clean Air Act amendments of 1990. It is commonly used as a fire extinguishing agent. The reason it has so much ozone depleting potential is because it contains bromine, which has many times the ozone depleting potential of chlorine. [Biochemical Pharmacology; v22; 2843-2851; 1973.] [Science; v272; 1763-1768; 1996.]