What is a Mica Tube?
A mica tube is a cylindrical insulating component made from layered mica paper—typically muscovite or phlogopite—bonded with high-temperature resistant resins and wound or molded into a tubular shape. These tubes provide excellent thermal insulation, electrical resistance, and mechanical strength, making them ideal for harsh operating environments that involve high heat and electrical stress.
Mica tubes are widely used in electrical equipment, heating elements, motors, transformers, and high-temperature industrial applications.
Production Process
Mica tubes are usually manufactured through spiral winding or molding processes using layers of resin-impregnated mica paper. The layered structure provides dimensional stability and high insulation performance under thermal and electrical stress.
Mica Paper Preparation
Natural mica is ground into flakes and made into thin, flexible paper sheets.
Resin Impregnation
Mica paper is impregnated with high-temperature binders like silicone or epoxy resin.
Winding or Molding
The mica paper is spirally wound or compression molded into tubes over mandrels to achieve the desired diameter and wall thickness.
Hot Pressing and Curing
Tubes are cured under heat and pressure to solidify the structure.
Finishing
The ends are trimmed, and the tubes are machined to required dimensions. Surface treatments or coatings may be applied upon request.
Key Properties
Thermal Resistance: Withstands continuous temperatures of up to 1000°C (phlogopite)
Electrical Insulation: Dielectric strength of 15–20 kV/mm
Non-flammable: Rated Class A for fire safety
Chemical Stability: Resistant to acids, alkalis, oils, and solvents
Mechanical Strength: High rigidity and impact resistance
Machinable: Ends and diameters can be lathed, drilled
Muscovite Mica Tubes
- Higher dielectric strength
- Better chemical resistance
- Stable up to 300–500°C
- Transparent to silver-gray in color
Phlogopite Mica Tubes
- Working temperature 700℃，peaks of 1000°C
- Ideal for thermal shock applications
- Brown or golden in color
- Used in metallurgy and furnace insulation
Applications of Mica Tubes
Mica tubes are trusted components across power electronics, heat-intensive systems, and rotating electrical machines, including:
| Category | Applications |
|---|---|
| Electrical Equipment | – Insulating sleeves for transformer windings – Internal insulation for motors and generators – Terminal bushings in high-voltage systems |
| Heating Elements | – Housing for ceramic or resistance heating wires – Electric furnaces and coil insulation – Supporting structure for heating rods or tubes |
| Industrial Applications | – Thermal barriers in metallurgy and foundries – Arc shielding in welding equipment – High-voltage cable insulation |
| Aerospace & Automotive | – Fire-resistant tubes in electric propulsion systems – Insulation in battery modules and control units |
Why Choose Our Mica Products?
Goldenmica provide high-quality muscovite and phlogopite mica tailored for demanding industrial applications. Our products ensure:
✔ Superior dielectric performance
✔ Exceptional thermal and mechanical stability
✔ Customizable forms (sheets, films, precision-cut components)
✔ Compliance with international industry standards
Discover how our mica solutions can enhance your industrial processes—contact us today!