Class 155 polyurethane overcoated with polyamide self-bonding round copper magnet wire is a specialized type of enameled wire designed for high-performance solderable applications.
Specifications
| Insulation materials | The conductor shall be coated with a multiple film. The underlying coating is based on polyurethane. The intermediate coating is based on polyamide. The superimposed coating is based on resins that are self-bonding in character. |
| Dimensions | Type 1: 14-44 AWG in accordance with 0.067mm-1.732mm Type 2: 14-44 AWG in accordance with 0.074mm-1.773mm |
| Certificate | MW 136-C |
| Thermal Class | 155 |
Properties
| Adherence and flexibility | No cracks visible in the film coating |
| Elongation | Not less than the value in 5-38 |
| Heat shock | No cracks visible in the film coating after conditioning at 175ºC |
| Springback | Not greater than the value in Type 1 42-66；Type 2 46-70 |
| Dielectric breakdown | 14-23.5 AWG: not less than the value in Type 1 2470v-3170v；Type 2 4440v-5690v 24-37 AWG: not less tham the value in Type 1 610v-1220v；Type 2 1020v-2190v 38-44 AWG: not less than the value in Type 1 275v-450v；Type 2 550v-850v (polyamide col.) *Polyamide column |
| Continuity | Max number of discontinuities in accordance with Type 1 350-1000；Type 2 500-1500 |
Solderability
Covered with continuous film of solder after immersion within the time and temperature specified:
| AWG Size | Temperature | Type 1 | Type 2 |
| 14-19.5 | 430ºC | 8 seconds | 10 seconds |
| 20-23.5 | 430ºC | 6 seconds | 8 seconds |
| 24-29.5 | 390ºC | 5 seconds | 6 seconds |
| 30-36 | 390ºC | 4 seconds | 5 seconds |
| 37-44 | 390ºC | 3 seconds | 4 seconds |
Periodic conformance tests
| Thermoplastic Flow | Median not less than 200ºC |
| Dielectric breakdown at rated temperature | Average not less than 75% of the value required at room temperature |
| Bond strength at room temperature | 18, 26 AWG: no break in the coil specimen when subjected to the load specified in table 1 36 AWG: no separation of turns other than the first or last turn |
| Bond strength at elevated temperature | Bond conditions and strength requirements as agreed between customer and supplier |
Table 1
| AWG | Mandrel Diameter* | Maximum | Test Load* | |||||||
| Winding Tension | Bonding Load* | After Heat Bonding | After Solvent Bonding | |||||||
| inches | mm | grams | newtons | grams | newtons | kilograms | newtons | kilograms | newtons | |
| 18 | 0.250 | 6.35 | 1220 | 12.0 | 408.0 | 4.00 | 9.0 | 88.3 | 4.5 | 44.1 |
| 26 | 0.157 | 3.99 | 200 | 2.0 | 76.0 | 0.75 | 1.6 | 15.7 | 0.80 | 7.85 |