Densities, viscosities, and refractive indices of the ternary mixture consist of (2-methyl-2-butanol (1) + tetrahydrofuran (THF) (2) + propylamine (3)) at a temperature of 298.15 K and related binary mixtures were measured at temperatures of (288.15, 298.15, and 308.15) K at ambient pressure. Data were used to calculate the excess molar volumes and the deviations of the viscosity and refractive index. The Redlich-Kister and the Cibulka equations were used for correlating binary and ternary properties, respectively. The ERAS-model has been applied for describing the binary arid ternary excess molar volumes and also Peng-Robinson-Stryjek-Vera (PRSV) equation of state (KIS) has been used to predict the binary and ternary excess molar volumes and viscosities. (C) 2010 Elsevier Ltd. All rights reserved.