we can supply high quanlity mica sheets: R-5660-H series of Rigid Mica Plate is mica laminates designed for providing outstanding electrical insulation at high temperature, which consist of approximately 90 % Muscovite (or Phlogopite) and 10% high temperature resistant silicone resin. Excellent resistance to heat up to 1000°C . R-5660-H series have unique temperature resistance, the maximum working temperature for the Muscovite Mica Plate and Phlogopite Mica Plate are approximately 500 and 750 respectively, Peak work temperature are 750 and 1000 respectively. 1. Excellent electrical insulation. R-5660-H series have excellent dielectric properties, the maximum dielectric is more than 20KV/mm. 2. Excellent punchability. R-5660-H series have good flexural strength and can be cut very precisely using die-stamping. 3. Environmentally safe. R-5660-H series generate very little smoke even at excessive temperatures.