This paper presents a new predictive method for the sublimation pressures of heavy lt-alkanes from C20H42 to C35H72 in the temperature range 308-348 K. The peculiar behavior of solid n-alkanes in terms of their heats of solid transitions is reviewed briefly. Also, the behavior of heat capacities of the n-alkanes through the solid-solid transitions is discussed, and the relative importance of this behavior is evaluated. Finally, the new expression for the sublimation pressures of n-alkanes is compared with other available correlations.