Commutator mica

Commutator Mica Sheets are made of natural muscovite mica splitting’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. Besides they have extremely low compressibility as is essential in maintaining the commutator's dimensional stability under large centrifugal stresses in operation. Their other properties are smooth surfaces, uniform thickness, great resistance to crushing and excellent machinability. Commutator mica sheets bonded with shellac resins provide excellent overall properties. Epoxy and alkyd yield dimensional stability with ability to withstand extreme compression stress.

Hot moulding mica

Hot-Molding Mica sheets are produced from natural muscovite mica splitting’s bonded with a thermoplastic resins shellac, epoxy or alkyd-vinyl by applying adequate heat and pressure. The amount of bond content range from 18% to22% depending on type of product demanded. The relatively high amount of bond facilitate the mica to slip relative to each other during the molding process as necessary in assuming the desired contour.

These sheets are rigid at room temperature but soften when heated at temperature between 100° C to 140° C and could easily be molded into practically any shape upon the application of either hot or cold process. With further cure, the sheets form into rigid well-bonded structure retaining the shape of their molded forms. Molding sheets bonded with shellac provides optimum moldability having excellent overall properties and have been traditionally most popular, while epoxy or alkyd-vinyl bonded sheets offer toughness and durability under severe mechanical stress applications.

Heater mica

HEATER MICA SHEETS are produced from natural muscovite mica splitting’s bonded with synthetic, epoxy or silicone resins suitable for thermal class 'B', 'F', and 'H' into a rigs sheets under high heat, and pressure conforming to IEC Standards371.3.3. These sheets are hard and dense and could readily be punched to any specified shape and designs providing and excellent overall properties. They have high dielectric strength, flexural strength, and thermal stability, low moisture absorption and good arc resistance properties. They are superior product in intensity, waterproof ability, incombustibility and electrical insulating properties.

Flexible mica

FLEXIBLE MICA SHEETS are produced from natural Muscovite mica splitting’s bonded with polyester or silicone resins. The controlled low binder content assures a thoroughly cured product in which the binder will not ooze or flow from the mica structure. They possess excellent flexibility and adhesiveness to permit winding or wrapping of the sheets at room temperature without heating. They can be formed or bent readily to any shape and will not become brittle and stiff.

They can be applied to unusual configuration without tear. They remain flexible at room temperature, rigid at high temperature, develop increased tenacity and are fully oil resistant. Besides they do not react with copper. They have high moisture and heat resistance, high dielectric strength, excellent chemical resistance and electrical insulating properties. They have long shelf life and thus eliminates inventory problems normally encountered with conventional electrical insulating products.