The PVTx properties of the refrigerant mixtures of R1234yf and R152a with a mass fraction of R1234yf from 0.600 to 0.900 were measured using the method of Burnett's isothermal expansions. The temperature range was from 288.15 to 328.15 K with a temperature interval of 10 K. The standard uncertainties of the experimental setup were estimated to be 8.1 mK for temperature and 1.73 kPa for pressure. The relative uncertainties were 0.0008 for the compressibility factor and 0.006 for density. According to the obtained experimental data of densities and compressibility factors for the mixtures, gaseous virial equations of state and their second and third virial coefficients were fitted. This would be helpful for the use of R1234yf/R152a mixtures as new environmentally friendly refrigerants.

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