Class 240 Polyimide Film-Insulated Round Copper Magnet Wire adopts aromatic polyimide resins and 99.5% – 99.9%pure copper conductor. It is widely used in special motors, nuclear industry, generators, automotive windings, aviation and aerospace windings, medical equipment and other fields.
Table 1 Specifications
| Insulation materials | aromatic polyimide resins |
| Thermal Class | 240 |
| Dimensions | Single and Heavy 14-50 AWG |
| Insulation thickness | Single, Heavy |
| Certificate | UL |
Table 2 Properties
| Adherence and flexibility | No cracks visible in the film coating |
| Elongation | Not less than the value 7-33 |
| Heat shock | No cracks visible in the film coating after conditioning at 280°C |
| Dielectric breakdown | 14-23.5 AWG: not less than the value in 2470V -5690V 24-37 AWG: not less than the value in 1220V -4380V 38-56 AWG: not less than the value in 80V -850V |
| Continuity（V） | 14-44 AWG: max number of discontinuities in accordance with 350±5% – 1500±5% 45-50 AWG: max number of discontinuities in accordance with 10-25 |
| Springback | 14-30 AWG: Maximum Degrees per Turn: not greater than the value in 46- 70 Mandrel Diameter (mm): not greater than the value in 82.6±0.127 – 19.0 ±0.127 Tension (±2%): not greater than the value in 4.45 ±2% – 0.56 ±2% |
Table 3 Periodic conformance tests
| Solubility | Specimens immersed in xylene or 50/50 xylene/butyl Cellosolve shall not soften sufficiently to expose the bare conductor |
| Dielectric breakdown after R22 conditioning | 14-24 AWG: average not less than the value required at room temperature |
| Scrape resistance | Lowest grams-to-fail load for any one of three tests, and the average of the three tests shall not be less than the values in 260-740 |
| Toluene / ethanol compatibility | No swelling or blistering in the film coating |
| Thermoplastic flow | Median not less than 450°C |
| Rated temperature | 14-37 AWG: average not less than 75% of value in 1220V – 5690V |
| Refrigerant R22 extraction | 14-24 AWG: not greater than 0.25% of weight of film insulation |
Features
Radiation resistance
Solvent resistance
Cryogenic resistance
electrical properties
Highest thermal stability (> 20000 hrs. at 243 ℃)
Exceptional resistance to chemicals
Outstanding mechanical properties
Stable electrical properties over wide range of temperature (25 ℃ to 250 ℃)
Withstands excessive overloads and cut through, repeated thermal shocks, prolong exposure to solvents of varnish.
Excellent adherence and flexibility of film coating