Abstract: Ceramic material has high thermal conductivity and high mechanical strength. Therefore, ceramic material has application potential in SF₆ insulated high voltage DC electrical equipment. The electrical conductivity, surface charge, mechanical properties and acid corrosion resistance of a new type of ceramic material were explored in this paper, and were compared with engineering epoxy-based material. It is found that the volume resistivity of ceramic at room temperature and low field is 4.5×10¹⁵Ω·m, and its temperature dependence is lower than epoxy-based material; under positive and negative DC voltages, the ceramic surface accumulates positive surface charges, and the maximum charge density is only 0.21pC/mm², which is 54% lower than epoxy-based material; in addition, the ceramic material shows better mechanical and acid corrosion resistance. According to the electrical conductance mechanism model based on the physical and chemical structure and the calculation results of the electric field of the supporting insulator under the temperature gradient, the excellent characteristics and great application potential of ceramic were verified. The research results provide a new idea for improving the surface insulation performance of SF₆ insulated HVDC electrical equipment, and provide a theoretical basis for the engineering application of this new type of ceramic material.