#BromineMarket Bromine's main market has been the flame retardant market. Since they primarily work in the vapour phase by inhibiting the flame chemistry, halogen-containing flame retardants are not polymer-specific like phosphorus-containing flame retardants. 9-Bromine-containing substances prevail because they are not only more effective than their chlorine-containing counterparts, but also because most organobromine compounds include a significant mass percentage of bromine due to its high atomic weight.