Experimental data of physical properties such as density in binary mixtures are of important from the fundamental and practical point of view. Thermophysical properties are required for the design of industrial processes. In this work, densities of [C4mim][PF6] (1) + 1-propanol (2) mixtures were determined via a vibrating tube densimeter at temperatures from 313 to 343 K and pressures up to 15 MPa. A 6-parameter Equation was used to correlate the Experimental Data. This Equation represents data within the experimental uncertainty of 0.2 kg/m3. Obtained Densities of this work were compared with those from literature were available.