Janz and Tomkins (1981) suggested two correlations for FLiNaK thermal conductivity. These authors explained in their review a decrease in the measured values for the property (about 20-30%) after an extended experiment, due to the contact with the containing material (Inconel). Ewing et al. (1962) also reported a similar behavior: because of the solution of container materials during the experiment, the measurement of transmission coefficients showed a clear decrease. (See also .Thermal properties global comparison. in the Uncertainties for FluZirK section)