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The densities and viscosities of ethyl heptanoate and ethyl octanoate were measured at temperatures ranging from 303 to 353 K and at pressures ranging from 0.1 to 15 MPa. The expanded uncertainties of density and the relative expanded uncertainty of viscosity are better than 5 kg·m–3 and 0.015, respectively. Experimental results show that the densities and viscosities of the two fatty acid ethyl esters increase with the increasing pressure and decrease with the increasing temperature. The density data were correlated using the Tait equation, and the viscosity data were correlated using the Andrade–Tait model. The average absolute relative deviations between the experimental data and the calculated results for the densities and viscosities were less than 0.03% and 0.47%, respectively.

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Blending methyl ester biodiesel and ethyl ester biodiesel can improve the properties of biodiesel. The densities and viscosities of the mixtures of methyl dodecanoate plus ethyl octanoate with various compositions were reported at temperatures from 303.15 to 323.15 K and at pressures up to 15 MPa. Experimental data show that the densities and viscosities of the mixtures of methyl dodecanoate plus ethyl octanoate will increase when temperature decreases or pressure increases. Ethyl octanoate can effectively reduce the viscosity of methyl dodecanoate with a small change in density. Correlations for the data of density and viscosity were proposed with maximum absolute relative deviations less than 0.04 and 5.8%, respectively.