Polychloroprene contains about 40% chlorine in a thermally stable backbone structure. It has a long history of use for applications requiring flame retardancy, such as conveyor belts, mass transit vehicle interiors, electrical insulation and jackets. A book was published by DuPont in 1963 on Neoprene. Typically, the formulation will contain 5-15 phr antimony trioxide, 5-15 …