Mica Tape Electrical Insulation

Mica tape is an interesting product that has multiple uses both for industrial and residential purpose. Chemically, micas can be given the general formula –

X₂Y_4-6 Z₈O₂₀(OH, F)₄

In which:

• X is K, Na, or Ca or less commonly Ba, Rb, or Cs;
• Y is Al, Mg, or Fe or less commonly Mn, Cr, Ti, Li, etc;
• Z is chiefly Si or Al, but also may include Fe3+ or Ti.

Structurally, micas can be classed as dioctahedral (Y = 4) and trioctahedral (Y = 6). If the X ion is K or Na, the mica is common mica, whereas if the X ion is Ca, the mica is classed as brittle mica.

• Mica tape is used mainly in the electronic and electrical industries.

• High-quality block mica is processed so that it is possible to create gauge glasses of high-pressure steam boilers. This can be done because of the high flexibility, transparency, and resistance to heat and chemical attack nature of Mica tapes.

• Mica sheets are used to provide structure for heating wire (such as in Kanthal or Nichrome) in heating elements and can withstand up to 900 °C (1,650 °F).

Advantages of mica tape: –

• Good dielectric strength
• Inorganic content
• Does not support corona
• Thermal conductivity
• Low dissipation factor
• Easily impregnated with resin