Flexible insulation film mica based
Guerzoni is the official distributor of Mica produced by Sweco, one of the most innovative and modern companies in the production of Mica-based insulation material. Mica is a mineral formed by parallel sheets of silicate tetrahedra on each side of an octahedral layer. Depending on the elements and their position in this structure, a great variety of micas have been established. Two of them are mainly used by electromechanical market: the most prevalent type is Muscovite (light colored mica), in which aluminum is a major component of the octahedral layer;
The other grade of mica is Phlogopite (darker colored mica), which contains magnesium as a major component of the octahedral layer.
Furthermore, mica is incombustible and withstands temperatures of 600° to over 1000° C.
Depending on the use and application of the end customer and based on the dielectric characteristics, the mica is used:
- For conductor insulation: This mica tape is used for insulation of cables and copper conductors for high voltage motors and generators. It has excellent flexibility which bonds well to copper conductors.
- For VPI (Vacumm pressure impregnation): Dry type was developed for vacuum pressure impregnation of electric motors. Its impregnation is very good as it contains small amounts of adhesive. It can be made with various adhesives, supporting materials and accelerators, according to specific requirement. SKF,SRF type contains Aramid fibre in the mica and has an excellent resin impregnation without spreading the mica particles.
- For Resin rich type: Prepreg mica tape is made of calcined muscovite mica paper impregnated with heat resistant epoxy resin and bonded with various supporting materials, such as glasscloth, polyester film and polyerter fleece.
When prepreg mica tape is subjected to heat and pressure, the resin flows and cures to void-free insulating materials. The SR854T has excellent cut-through resistance which makes it suitable to be used as a conductor insulation materials.