Mica has been used because of the following reasons.

  • Thermal insulation – Mica has excellent thermal insulation properties. Due to which, heat transfer to copper conductor has been reduced, thereby reducing the chances of softening of copper.
  • Fire resistance – Mica has a high melting point of over 1000°C, thereby preventing risk of fire.
  • Low thermal expansion – it has very less thermal expansion. So it remains stable under severe temperature.
  • Dielectric strength – Mica has high dielectric strength approx. 10 times than PVC.

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