Lead-Bismuth Eutectic or LBE is a eutectic alloy consisting of 45 percent lead and 55 percent bismuth. It is foreseen as a possible coolant for Generation IV nuclear reactor systems. The most interesting properties of LBE in comparison with lead and water are presented in Table 1. A principal advantage of LBE over lead is the low melting point of 125 ░C, rather than lead's 327 ░C. If the heat source in a nuclear system is shut down, then it is much easier to avoid freezing of the coolant.