Commutator Mica Sheets - Natural Muscovite Mica Splittings, High Dielectric Strength And Thermal Stability, Rigid Insulation For Electric Motors

Laminated Mica or Mica products are employed in electrical engineering already since the turn of the century. Micanite is the name given to sheet material which is made up of fine mica lamellae, called "splittinga s", bonded together by a variety of bonding agents such as Shellac, epoxy, alkyd or silicone, in order to obtain particular characteristics for specific uses. Variations can be made in the method of manufacture, the types of Mica, and the type of quantity of bonding material used to form thick or thin, stiff or flexible products in the form of sheets, webs or ribbons and also molded articles. Commutator Mica Sheets are made of natural muscovite mica splittinga s bonded with a minimum amount of resins in compact, dense and rigid flat plates by means of multiple high temperature pressing primarily for use as insulation between copper segments or bars of commutators used in traction motors as well as other electric motors and turbo-generators. The resin is cured for several hours at high temperature to preclude any oozing or slippage of the mica. The natural cohesive forces between the mica platelets combined with the bonding strength of the rigid thermosetting binder makes these plates adequately resistant to high heat and pressure encountered in the commutators. These plates have high dielectric strength, high thermal stability, good voltage endurance and excellent mechanical and electrical properties.