Mechanical fatigue strength of micaeous composite insulation

Mica has been used favorably as the main barrier material for machine coil insulation. Recent extension of the mica paper (reconstituted mica) is due to advantages relative to economy, homogenous quality and development of synthetic resins for use in a reliable composite insulation. Several kinds of mica papers are presently available. These mica papers are produced by different processes and from different raw materials. It is natural that they have different flake size and surface properties which may affect the final properties of the composite insulation.