is the core part of the lightning arrester. It uses zinc oxide as the main component, adding a small amount of bismuth oxide, cobalt oxide, chromium oxide, manganese carbonate, antimony oxide and other trace additives, and is sintered at high temperature. The microstructure of metal oxide resistors is mainly composed of zinc oxide grains, grain boundary layer and spinel phase.

The manufacturing process of resistors is a very important aspect to ensure the performance of resistors. In commonly used formulas, additives only account for about 5% to 10% of the total weight. To mix additives and Zn0 evenly, the particles of additives should be fine and organic. Composition and content are crucial to the uniformity of the mixed slurry, and the uniformity of the slurry is one of the guarantee factors affecting the uniformity of the composition and structure of the porcelain body.