ELECTRIC INSULATING VARNISH KO-921FEATURESVarnish KO-921 is a clear homogenous solution of polymethylphenylsiloxane resin in organic solvents. Polymethylphenylsiloxane resin is obtained by hydrolytic co-condensation of phenyltrichlorsilane and dimethyldichlorsilane with further polymerization.

APPLICATIONS

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Varnish KO-921

Glass winding of wires and cables

impregnation. It is also used as impregnating and coating varnish, operating at 250°C.

As a protective coat for metal forms for baking bread and

biscuits.

In food industry, the varnish is used as release agent for

metal forms for baking meat.

The electric machines and

apparatus protection from mold and fungi.

Advantages

Low drying temperatureGood dielectric propertiesGood heat resistant (up to +250°С)Protects the electric machines and apparatus from mold and fungiSafe for food industry using (as a release coating for baking metal molds)

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PHYSICAL AND CHEMICAL PROPERTIESNAME OF PARAMETER AND UNIT OF MEASURE STANDARD

Mass content of nonvolatile substances, % 50 ± 2

Viscosity at 20°C, by viscometer VZ-246 with orifice Ø 4 mm, s 17-27

Dryout time, 3rd degree, (200±5)°C, minutes, max. 15

Weight of Si-bound hydrogen, %, max. 0,001

Thermoelasticity at 200°C, h, min. 75

Optical density, max. 0,5

Dielectric properties Test conditions

R,М(15-35С) 45-75% R,M(180С) <20% 28,5-32,5

Varnish coat volume resistivity, Ω•m, min. 1,0×1012 1,0×1010 1,0×1011

Electric strength, MV/m, min. 75 35 35

SAFETY INFORMATIONThe polymerized varnish coat is nontoxic, fire-safe. GUARANTEED SHELF LIFE 12 MONTHS GOST 16508-70 AMENDMENT 1-5

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