Thermal properties of cross-linked and uncross-linked low-density polyethylene (LDPE)/Fischer-Tropsch wax blends were investigated in this paper. For cross-linked blends, the gel content was determined. It was observed that the gel content increases with an increase in DCP concentration. The degree of crystallinity decreased with an increase in DCP concentration. The wax and LDPE were not mutually miscible at higher wax concentrations in the crystalline phase, as well as in the melt. The thermal stability of the blends decreased with an increase in wax content, and no direct correlation between thermal stability and cross-link density was observed.