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Litz Film Insulations

Insulation Rating AWG Advantages Considerations
Polyvinyl Formal Class 105
MW 15-C
14 - 50
  • Excellent abrasion resistance
  • Excellent compatibility with transformer oils
  • Good electrical properties
  • Used in Cryogenic Applications
  • Must be stripped before soldering
  • Should be annealed before application of varnish
Polyurethane Class 155
MW 79-C

Class 180
MW 82-C
30 - 50


24 - 50
  • Excellent electrical properties for high Q coils
  • Easily solderable 390°C/360°C
  • Excellent film adhesion & flexibility
  • Good moisture & chemical resistance
  • Not recommended for applications with the possilbility of severe thermal overload
Polyurethane-Nylon Class 155
MW 80-C

Class 180
MW 83-C
10 - 46


25 - 46
  • Good electrical properties
  • Easily solderable 430°C/39°C
  • Excellent film adhesion & flexibility
  • Improved chemical & mechanical resistance from nylon topcoat
  • Nylon overcoat provides low coefficient of friction
  • Not recommended for applications with the possiblity of severe thermal overload
  • Nylon topcoat is hygroscopic
Solderable Polyester Class 180
MW 77-C
14 - 50
  • Solderable 470°C
  • Excellent thermal properties
  • Good electrical properties
  • Good compatibility with varnishes & solvents
  • Improved thermal overload
  • Good moisture resistance
  • Low abrasion resistance compared to Nylon & amide imide topcoat materials
  • Preheat before varnishing is recommended
Solderable Polyester
Nylon
Class 180
MW 78-C
14-50
  • Solderable 470°C
  • Excellent thermal properties
  • Good electrical properties
  • Good compatibility with varnishes & solvents
  • Improved thermal overload
  • Good moisture resistance
  • Nylon overcoat provides low coefficient of friction
  • Nylon topcoat is hygroscopic
  • Preheat before varnishing is recommended
Polyester(amide)(imide) Class 200
MW 74-C
34 - 44
  • Excellent flexibility & abrasion resistance
  • Excellent thermal overload
  • Excellent dielectric strength
  • Excellent moisture resistance
  • Good chemical resistance
  • Must be stripped before soldering
  • Not recommended for use in oil-filled transformers
  • Preheat before varnishing
Polyester/Poly-amideimide
Overcoat
Class 200
MW 35-C
8 - 33
  • Excellent flexibility & abrasion resistance
  • Excellent thermal overload
  • Excellent dielectric strength
  • Excellent moisture resistance
  • Good chemical resistance
  • Must be stripped before soldering
  • Preheat before varnishing
Polyimide Class 240
MW 16-C
10 - 30
  • Excellent flexibility
  • Excellent thermal overload
  • Excellent radiation resistance
  • Excellent chemical compatibility
  • High dielectric strength
  • Adequate abrasion resistance
  • Low outgas
  • Must be stripped before soldering
  • Must be annealed before varnishing
  • Will solvent craze