Specific conductivities (kappa) of concentrated aqueous solutions of several fluorine containing electrolytes, fluoroboric acid (HBF4), fluorosilicic acid (H2SiF6), and fluorotitanic acid (H2TiF6), at mass percents (100w(Ac)) from 10 to 50 at 15, 25, 35, and 45 degrees C have been measured by making use of an automatic system based on the "electrodeless conductivity" technique. The results have been analyzed in terms of the well-established Casteel-Amis equation and by polynomial equations in the concentration. As a result, empirical models of the type kappa = f(100w(Ac))(t) have been proposed, which reproduce the results of each chemical system with an overall precision of about +/-0.3% and enable the interpolation of conductivity at each temperature in the whole range of concentration studied.