The commutator mica board is a hard insulating material made by bonding powdered mica paper with epoxy resin adhesive and then baking and pressing it. The product has uniform thickness and high electrical properties. It is suitable for insulation between the copper sheets of a DC motor commutator operating at a temperature of 130℃.

Mica boards offer excellent insulation properties and high-temperature resistance, allowing for long-term use at temperatures up to 1000°C. They are widely used in industries such as metallurgy, chemical engineering, and household appliances, including hair dryers, electric irons, heating coils, curling irons, electric combs, industrial furnaces, medium-frequency furnaces, arc furnaces, steelmaking furnaces, mineral furnaces, iron alloy furnaces, electrolytic aluminum cells, and injection molding machine motors. These are hard or soft board insulation materials made by bonding mica paper with high-performance silicone resin through bonding, heating, and pressing. The mica content is approximately 90%, with the silicone resin content at 10%.