Measurements on density and viscosity at atmospheric pressure for the ternary system 1,2,3,4-tetrahydronaphthalene (1) + isopropylcyclohexane (2) + cyclopropanemethanol (3) and three corresponding binary systems from (293.15 to 343.15) K have been carried out over the whole composition range. The excess molar volumes (V m E) and viscosity deviations (Δη) of the ternary system have been derived from the experimental data and then fitted to the Cibulka, Singh, Redlich–Kister, and Nagata–Tamura equations, respectively. The binary subsystems were correlated by Redlich–Kister equation. For the system of 1,2,3,4-tetrahydronaphthalene + isopropylcyclohexane, the curve of the V m E reveals a wing shape. The V m E values are positive for the other two binary systems of 1,2,3,4-tetrahydro­naphthalene + cyclopropane­methanol and isopropyl­cyclohexane + cyclopropane­methanol. While the value of Δη for all three binary systems is negative over the entire composition range. The results are interpreted with molecular interactions and structural effects.

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