The densities and viscosities of binary mixtures of paraldehyde + propylene carbonate have been measured at (288.15, 293.15, 298.15, 303.15, and 308.15) K. From these measurements, excess molar volumes (V-E) and viscosity deviations (delta(eta)) were calculated. These results were fit to a Redlich-Kister polynomial. The results were discussed in terms of molecular interactions.