MAGNET WIRE

• P.U. (Polyurethane) 130° C
  
• P.I. (Polyesterimide) 180° C
  
• API (Armoured Polyesterimide) 220°C
  
• Application Guide

P.U. (Polyurethane) 130° C

Transwire's PU is manufactured with an improved type of modified polyurethane film coating which has many desirable properties such as solderability, low loss at high frequencies and superior corona resistance.

Characteristics

1. Solderable without prior removal of film at 375°C (680°F)
2. Good abrasion resistance.
3. Compatible with many varnishes and impregnating compounds.
4. Good heat shock resistance and retention of flexibility after heat ageing.
5. Excellent dielectric strength.
6. Superior dielectric loss properties at high frequencies.
7. Superior moisture resistance.
8. Good solvent resistance
   
9. Abrasion resistance not sufficient for some high speed automatic winding applications.
10. Susceptible to solvent crazing (will self-heal).

Typical Applications†

• Field, ignition, regulator, horn, meter, and miscellaneous electronic coils (R.F. flyback, choke, etc.)
  
• Ballasts (fluorescent).
  
• Miscellaneous small transformers (appliances, controls, etc.).
  
• Open motors (fractional and smaller)
  
• Electric valve coils
  
• Telephone and switching equipment relays.

P.I. (Polyesterimide) 180°C

PI is based on a modified Polyesterimide resin developed for magnet wire use without the amide-imide topcoat. It is not recommended for use in oil-filled transformers.

PI has excellent electrical properties, windability, abrasion resistance, solvent resistance, and meets the heat shock requirements at 200°C.

Characteristics

1. Thermal stability allows use at 180°C.
2. Good windability.
3. Good heat shock resistance.
4. High thermoplastic flow temperatures.
5. Good overload resistance.
6. Extremely high dielectric strength, even when exposed to moisture.
7. Tends to hydrolyze in presence of water at elevated temperatures and is, therefore, not recommended for totally enclosed systems.
8. Susceptible to solvent crazing (will self-heal).

Typical Applications†

• Motors and dry type transformers and all coils requiring high temperature ratings.

API (Armoured Polyesterimide) 220°C

API magnet wire is based on polyesteramide-imide resin designed for excellent high temperature performance.

API has all of the basic properties required for winding and performance plus added thermal characteristics rendering it suitable for continuous service up to 220°C

1. Thermal stability allows use at 220°C.
2. Good windability.
3. Very good heat shock resistance.
4. High thermoplastic flow temperatures.
5. Good overload resistance.
6. Extremely high dielectric strength, even when exposed to moisture.
7. Susceptible to solvent crazing (will self-heal).

Typical Applications†

• Automotive alternators
• Ballasts (mercury)
• Distribution, and power transformers - class 220°C
• Open (fractional and smaller) motors hermetically and totally enclosed motors (fractional and smaller), and integral motors
• Start windings
• Generators
• Solenoid, and brake coils

Application
Guide