Silicon
In addition, the silicon film coatings have high resistance to water and resistant to electric sparks (enamel KO-99). Lac EF-3 is available in two grades: EF-BSA and EF-ZBSU, differing only in heat resistance (Thermo). Heat resistance of films of varnish EF-ZBSU on average twice the value of this Specifications for varnish EF-BSA. Lac EF-5 is available in three grades: the EF-5T; EF-BT *! and EF-5B, different concentrations (EF and EF-5T-5T! -40% probability, and the EF-5B - 60% concentration), solvents (EF and EF-5T-5T1! - toluene, and EF-5B - petrol) and their appointment (EF-5T is used for gluing in the production of mica and micanite steklomikalenty; lacquer EF-5T! - to impregnate the glass with adhesive tape). Lac EF-5B is used for gluing of mica in the production of special types of flexible mica isolation. Varnishes and enamels on the basis of PVC and vinyl chloride resins lane are resistant to water, hot oils, acid and alkaline chemical agents, so they are used to protect windings against moisture, oils and other agents. Keep in mind the weak adhesion (adhesion) and PVC-vinyl perhlor lacquers and enamels to metals. Recent initially covered with a layer of soil (based on glyptal and other resins), and then varnish or enamel on the basis of PVC resins or perchlorovinyl.
Drying of lacquers and enamels produced at 20 C. The disadvantages of PVC and perchlorovinyl coatings are their low operating temperature (70-80 C). Varnishes epoxy resins and polyesters are highly adhesive and cementing ability and high thermal stability (up to 155 C). Water-emulsion paints are stable emulsion lacquer bases in tap water. Lacquer bases' are made of synthetic resins, as well as drying oils (linseed, tung) and mixtures thereof. Water-emulsion paints fire and explosion, as they do not contain flammable organic solvents. Because of the low viscosity aqueous emulsion paints have very good impregnating ability. These paints are widely used to impregnate the stationary and rotating windings of electrical machines and apparatus, continuously operating at temperatures up to 105 C (Class A). The main characteristics of insulating varnishes and enamels, are widely used in electrical engineering.