AbstractThis article presents some test results of 83Pb17Li eutectic properties. This eutectic was produced by induction melting in the form of ingots with a volume of 30 l. It should be noted that inhomogeneity of eutectic composition and structure was revealed within one and the same ingot. Annealing at temperatures below melting point changes the micro structure i.e. increasing of the size of the β′-phase-particles takes place. The following values of eutectic thermal-physical properties were determined: enthalpy, specific heat capacity, thermal expansion, latent heat of melting. Some peculiarities of eutectic mechanical properties changing in the temperature range of 293 K to 473 K were investigated.