Electric Insulating Lacquers

Electric Insulating Lacquers

Used for impregnation of cables, transformers, electrical motors and apparatus.

Lacquer KO-921


Lacquer KO-921 is a clear homogenous solution of polymethylphenylsilxane resin in organic solvents. Polymethylphenylsiloxane resin is obtained by hydrolytic co-condensation of phenyltrichlorosilane and dimethyldichlorosilane with further polymerization.
    • Lacquer KO-921 is distinguished by its low drying temperature, good dielectric properties, moisture and heat resistance.
    • The product serves for impregnation of glass winding of wires and cables. It is also used as impregnating and coating lacquer, operating at 250ºC.
    • The product is widely used for protection of electric machines and apparatus from mold and fungi.
    • In food industry, the lacquer is used as release agent for metal forms for baking meat as well as protective coat for metal forms for baking bread and biscuits.
  • The polymerized lacquer coat is nontoxic, fire-safe.
  • Shelf life - 12 Months

Physical and chemical properties

Weight of non-volatiles, %   50 ± 2  
Viscosity, 20 ºC, by viscometer VZ-246 with orifice Ø 4 mm, s   17-27  
Dryout time, 3rd degree, (200±5)ºC, mins, max.   15  
Weight, of Si-bound hydrogen, %, max.   0,001  
Thermo elasticity, 200 ºC, hrs, min.   75  
Optical density, max.   0,5  
Dielectric properties   Test
M(15-35C) 45-75%
Volume resistivity, Ω·m, min. 1,0×1012 1,0×1010 1,0×1011
Dielectric strength, MW/m, min. 75 35 35