As a consequence of the regulatory announcement by the European Chemical Agency regarding the complete withdrawal of polyfluoroalkyl substances, which include HFE fluids, new dielectric fluids are being proposed by several companies. However, manufacturers do not provide the fluids' properties as functions of temperature. This work investigates the thermophysical properties, such as density, specific heat, kinematic viscosity, and surface tension of two novel dielectric fluids, namely Thermasolv IM1 and Thermasolv CF2. Density was determined by the buoyancy method, specific heat by the differential scanning calorimetry method, viscosity by the modified Couette method, and surface tension by the Wilhelmy plate method. Density, kinematic viscosity, and surface tension were studied in the temperature range from 273.15 to 328.15 K and in the range from 273.15 to 373.15 K for Thermasolv IM1 and Thermasolv CF2, respectively. The specific heat was investigated in the range from 263.15 to 313.15 K for Thermasolv IM1, and in the range from 273.15 to 348.15 K for Thermasolv CF2. The study proved that fluids' properties differ from the manufacturer's data. Moreover, the influence of applying the proposed property models to dimensionless numbers was investigated. The investigation showed that the error committed by using the producer data instead of temperature-dependent data is substantial. Furthermore, the study reveals that Thermasolv IM1 is a close thermophysical replacement for HFE-7100. Meanwhile, the differences between Thermasolv CF2 and HFE-7300 or HFE-7500 are too high to be considered as replacement fluids.
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