Mica electrical insulating materials. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Mica electrical insulating materials. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electricity for beginners

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In the development of natural mica and in the manufacture of electrical insulating materials based on plucked mica, a large amount of waste remains. Their utilization makes it possible to obtain new electrical insulating materials - mica. Such materials are made from mica paper, pre-treated with some kind of adhesive (resins, varnishes).

Solid or flexible mica electrical insulating materials are obtained from mica paper by gluing with adhesive varnishes or resins and subsequent hot pressing. Adhesive resins can be introduced directly into the liquid mica mass - mica suspension.

Among the most important mica materials, the following should be mentioned.

Collector slyudinite is a solid sheet material, calibrated in thickness. It is obtained by hot pressing sheets of mica paper treated with shellac varnish. Collector mica is produced in sheets ranging in size from 215 x 400 mm to 400 x 600 mm.

Cushioning mica is a solid sheet material obtained by hot pressing sheets of mica paper impregnated with adhesive varnishes. Gasket mica is produced in sheets 200 x 400 mm in size. Solid gaskets and washers are made from it for electrical machines and apparatuses with normal and increased overheating.

Forming glass mica is a solid sheet material in a cold state and flexible in a heated state. It is obtained by gluing mica paper with fiberglass substrates.

Molding heat-resistant glass mica is a solid sheet material molded in a heated state. It is made by gluing sheets of mica paper with fiberglass using a heat-resistant silicone varnish. It is available in sheets of 250 x 350 mm or more. This material has increased mechanical tensile strength.

Slyudinite flexible - sheet material, flexible at room temperature. It is obtained by gluing sheets of mica paper, followed by hot pressing. Polyester or organosilicon varnish is used as a binder. Most types of flexible mica are pasted over with fiberglass on one or both sides.

Flexible (heat-resistant) glass mica is a sheet material that is flexible at room temperature. Produced by gluing one or more sheets of mica paper with fiberglass or glass mesh using silicone varnishes. After gluing, the material is subjected to hot pressing. It is covered with fiberglass on one or both sides in order to increase mechanical strength.

Mica is a roll or sheet material, flexible when heated, obtained by gluing one or more sheets of mica paper with telephone paper 0,05 mm thick, used as a flexible substrate.

The scope of this material is the same as that of micafolium based on plucked mica. Sludinitofolium is produced in rolls 320-400 mm wide.

Mica tape is a rolled heat-resistant material, flexible at room temperature, consisting of mica paper, glued on one or both sides with fiberglass mesh or fiberglass.

Mica tapes are produced mainly in rolls with a width of 15, 20, 23, 25, 30 and 35 mm, less often in rolls.

Glass-boom-mica tape is a rolled, cold-flexible material consisting of mica paper, glass mesh and mica paper, glued and impregnated with epoxy-polyester varnish. From the surface, the tape is covered with a sticky layer of the compound. It is produced in rollers with a width of 15, 20, 23, 30, 35 mm.

Glass mica electrocardboard is a sheet material that is flexible at room temperature. It is obtained by gluing mica paper, electric cardboard and fiberglass with varnish. Is issued in sheets of 500 x 650 mm in size.

Author: Smirnova L.N.

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