Viscosities, ultrasonic velocities, and refractive indices (at 298.15 K) of binary mixtures of 2,4,6-trimethyl-1,3,5trioxane with dimethyl carbonate, diethyl carbonate, and propylene carbonate have been measured at (288.15 and 298.15) K. From these measurements, viscosity deviations (δη), excess molar isentropic compressibilities (K S,m E ), and refractive index deviations (∆n D ) were calculated. These results were fitted to the Redlich-Kister polynomial. The results were discussed in terms of molecular interactions.