Insulation

Thermal

Class (IEC)

Properties

Application

Polyvinylacetal

120

High resistance to abrasion

Excellent flexibility and adherence very resistant against hydrolysis very good thermal resistance

Distribution and power transformers, supply meters electrical equipment.

THEIC-modified

polyesterimide

180

Excellent resistance against solvents and other chemicals very good flexibility

Control systems, electrical equipment, air-cooled and cast resin dry type transformers, welding transformers

THEIC-modified

Polyesterimide

+ polyamide imide

200

Excellent thermal characteristics outstanding chemical resistance

Very good resistance to abrasion

AC and DC motors up to class H, oil immersed and dry type transformers, hermetic motors, magnet coils.

Polyamide imide

220

Excellent thermal characteristics and ageing resistance very good resistance to abrasion

AC and DC motors up to class H, oil immersed and dry type transformers, magnet coils and other electromagnetic applications

Polyvinyl acetale

With epoxy bond coat

120

(base coat)

Optimum curing is achieved between 120℃ and 130℃.

The bond coat hardens during the usual vapour phase process for drying of the coil.

Oil immersed transformers up to operating temperature 130℃

Polyvinyl acetale

with epoxy bond coat

120

(base coat)

Optimum curing is achieved between 110℃ and 120℃.

The bond coat hardens during the usual vapour phase process or hot air drying of the coil.

Oil immersed transformers up to operating temperature 130℃

Polyamide imide

with aromatic

polyamide bond coat

220

(base coat)

The temperature range between 180℃ and 230℃ is ideal for curing. Pressing of the coil during bonding increases the bond strength.

Dry type transformers and generators up to class F