Class 220 Polyester (Amide)(Imide) Overcoated with Polyamideimide Film-Insulated Round Aluminum Wire is a specific type of wire used in electrical applications.
Insulating Material: The conductor shall be coated with a dual film. The underlying coating is based on polyester (amide)(imide) resins. The superimposed coating is based on polyamideimide resins.
Dimensions:
| Insulation thickness | Diameter |
| single | 14-28 AWG min: 0.02mm-0.041mmmax:0.356mm-1.692mm |
| heavy | 8-24AWGmin: 0.041mm-0.081mmmax: 0.373mm-1.732mm |
Adherence And Flexibility: No cracks visible in the film coating
Elongation: Not less than 12%
Heat Shock: No cracks visible in the film coating after conditioning at 240ºC
Dielectric Breakdown: 4-7.5 AWG: not less than 3500V
8-23.5 AWG: not less than 2470V
10-28 AWG: not less than the 1100v
Continuity:
| BuildSelf-Bonding | SingleType 1 | Heavy Type 2 | Triple Type 3 | Quad |
| 14-24 AWG | 750 | 1500 | — | — |
| 24.5-28 | 500 | 1000 | — | — |
| Maximum Fault Count per 100 ft. | 25 | 10 | — | — |
Periodic Conformance Tests:
Solubility: Specimens immersed in xylene and 50/50 xylene/butyl Cellosolve shall not soften sufficiently to expose the bare conductor.
Dielectric Breakdown At Rated Temperature:
Average not less than 75% of the value required at room temperature.