Mica tubes are widely used as electrical and thermal insulation components in motors, transformers, household appliances, and heating equipment. Their unique properties—high dielectric strength, excellent heat resistance, and mechanical stability—make them indispensable in demanding industrial environments. But how exactly are mica tubes manufactured?

The production process begins with mica paper, which is made from natural or synthetic mica flakes. This paper is combined with a heat-resistant binder, usually silicone resin, to improve flexibility and bonding. To reinforce the structure, a layer of alkali-free fiberglass cloth is often added, giving the final product higher mechanical strength.

Next, the prepared mica paper is rolled onto a mandrel (a cylindrical mold) in multiple layers. Each layer is carefully overlapped to ensure uniform thickness and reliable insulation performance. The rolling direction, pressure, and winding technique all play an important role in determining the tube’s density and durability.

After winding, the tube undergoes a high-temperature curing process. During curing, the binder resin hardens, and the mica paper layers become permanently bonded. This step gives the tube its final rigidity and excellent thermal stability. Depending on customer requirements, the tube can then be cut, polished, or machined into specific dimensions.

The finished mica tube can withstand temperatures up to 1000 °C (depending on mica type) and offers reliable insulation under high voltage. This makes it suitable for electric heaters, arc chutes, cables, and a wide range of industrial applications.

In summary, mica tubes are produced by layering mica paper with resin and fiberglass reinforcement, rolling it onto a mandrel, and curing it at high temperature. Through this precise process, manufacturers create a product that combines thermal endurance, electrical insulation, and mechanical strength for critical applications.