Experimental high-pressure density data for the binary mixture of methyl nonafluorobutyl ether + hexane were determined. The pressure range considered was 0.1 to 25 MPa, and densities were measured along three isotherms, at temperatures of (283.15, 298.15, and 313.15) K. An Anton Paar DMA 4500 vibrating-tube densimeter, connected to a high-pressure measuring cell, was used for density measurement. Experimental data for the mixture were fitted using a modified Tait equation. Excess molar volumes were as well calculated and correlated, using a modified Redlich-Kister equation, which includes a temperature- and pressure-dependent factor.