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What is the difference between flexible mica sheet and rigid mica sheet?
Rigid board contains less binder, has higher strength and does not deform easily; it is mainly used for structural supports or spacers. Flexible sheet contains more binder, or uses a special flexible resin, and can be bent at room temperature; it is mainly used to wrap cylindrical bodies, such as the barrel of a hair dryer or motor slot insulation.
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What are the main uses of mica tape?
Mica tape is mainly used for fire-resistant cables and for coil insulation in large motors. In a fire, ordinary plastic insulation melts, whereas mica tape keeps its structural integrity inside the flame so that the circuit can continue to conduct for a period of time.
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What are mica products made of? Do they contain asbestos?
The raw material is natural mica ore (mainly a silicate mineral), processed by splitting, coating and lamination. Genuine mica products contain absolutely no asbestos. Mica is an environmentally friendly mineral, non-toxic and odourless, and complies with international environmental standards such as RoHS and REACH — it is entirely different from carcinogenic asbestos.
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What is the dielectric strength of mica products?
Typically above 20 kV/mm. This means a 1 mm thick mica sheet can withstand at least 20,000 volts without breakdown, which makes mica an excellent high-voltage insulating material.
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What thickness tolerance can be expected for mica sheet?
Industry-standard tolerances are typically between ±0.05 mm and ±0.1 mm. Because mica is built up by stacking and pressing layers, micron-level precision comparable to metal machining is not achievable.
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Which is better, synthetic mica or natural mica?
It depends on the application. Synthetic mica is purer, contains no impurities and withstands higher temperatures (above 1000°C), which makes it suitable for high-end optical or extreme high-temperature environments. Natural mica offers better value for money and suits the vast majority of industrial insulation requirements.
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What temperature can mica sheet withstand?
It depends on the type of mica:
- Muscovite — continuous service to about 500–600°C, short-term up to 800°C.
- Phlogopite — continuous service to about 700–850°C, short-term up to 1000°C.
- Synthetic mica — can exceed 1000°C.