ResinTech BSM-50 is a borate form hybrid anion resin selective for silica and antimony. BSM-50 contains hydrated iron oxide crystals monotonically dispersed throughout the polymer. It absorbs antimony, silica, and other contaminants by a combination of ion exchange and adsorption. BSM-50 is intended for removing trace levels of antimony and can also be used to remove silica from borated process waters. BSM-50 is supplied in the borate form.