Hydrogen Bromide HBr CAS No.: 10035-10-6 EINECS No.: 233-113-0 UN No.: UN1048 Purity: 99.99%-99.999% Dot Class: 2.3 Appearance: Colorless Grade Standard: Electron Grade,Industrial Grade Chemical: 1) Hydrogen bromide and hydrobromic acid are important reagents in the production of inorganic and organic bromine compounds. 2) HBr is used to open epoxides and lactones and in the synthesis of bromoacetals. Additionally, HBr catalyzes many organic reactions. Electronic: HBr has been proposed for use in a utility-scale flow-type battery. - -