Film insulations

Insulation

Temperature Rating

AWG Sizes Available

Advantages

Limatations

Polyvinyl Formal (Formvar)

Class 105℃

MW15-C

10 - 30

1. Very good resistance to abrasion and solvents.
2. Good electrical properties.

1. Must be stripped before soldering.

Polyurethane

Class 155℃

MW79-C

30 - 44

1. Solderable at 750℉ to 800℉.
2. Good film flexibility.
3. Good moisture and chemical resistance.
4. Excellent electrical properties, contributing to the manufacture of high "Q" coils.

1. Lower abrasion resistance than Polyvinyl Formal, Polyurethane with Nylon overcoat or Polyester, Polyester-amide-imide.

Class 155℃

Class 130℃

MW28-C

1. Solderable at 750℉ to 800℉.
2. Excellent film flexibility and abrasion resistance.
3. Good electrical properties.

1. Not recommended for use in hot transformer oil freon gases.

Polyester-imide Solderable

Class 180℃

MW77-C

1. Solderable at 800℉ to 850℉.
2. Good electrical properties.
3. Compatible with most varnishes and solvents.

1. Lower abrasion resistance than Polyurethane with Nylon overcoat or Polyester-amide-imide.
2. Not recommended for use in hot transformer oil or freon gases.

Polyester-amide-imide

Class 200℃

Class 200℃

MW74-C

1. Good flexibility and abrasion resistance (windability).
2. High solvent resistance.
3. Superior dielectric strength.
4. Excellent electrical properities and excellent moisture resistance.

1. Not recommended for use in oil-filled power and distribution transformers containing paper or other cellulosic materials.
2. Must be stripped before soldering.

Polyimide (ML)

Class 220℃

MW16-C

1. Excellent flexibility.
2. Adequate abrasion resistance.
3. High dielectric strength.

1. Will solvent craze.
2. Must be annealed 30 to 60 minutes at 175℃ to 200℃ before varnish teatment.
3. Must be stripped before soldering.