The specific conductivities (kappa) of the H2SiF6 + HF + H2O ternary system have been measured in a wide range of compositions, 8 < 100w(H2SiF6) < 45 and 0 < 100w(HF) < 12, at 25 and 35 degrees C by an automated system for conductimetric titration based on the "electrodeless conductivity" technique. An empirical model of the type kappa = f(100w(H2SiF6), 100w(HF)), which correctly fits the results at the two temperatures studied, is also presented.