This paper reports the density and viscosity of aqueous diisopropanolamine (DIPA) solutions at five temperatures in the range 25 degreesC to 70 degreesC over the whole concentration range. The results are compared with data published in the literature. The derived excess molar volumes, partial molar volumes, the partial molar volumes at infinite dilution, and viscosity deviations were correlated as a function of composition.