155 grade polyester glass fiber coated insulated square magnet wire consists of conductor (copper), polyester insulation layer and glass fiber coating layer.
Insulation material:
The fiber coating layer should be a combination of polyester and glass fiber. The glass fiber should be electrical grade continuous filament glass yarn. The polyester fiber should be a high-grade yarn produced by linear polymerization of ethylene glycol and terephthalic acid. The maximum content of polyester fiber in the yarn shall not exceed 50% by weight.
Table1 Characteristic:
| Adhesion and flexibility: | Single or Dual Layer with Primer: No visible cracks in the film insulation after 20% elongation. Inspect with normal vision without removal of the polyester fiberglass cover. Dual Layer Unprimed Film: Minimum thickness of the polyester fiberglass cover on one side not less than 75 V/mil (2950 V/mm) Note: Minimum thickness of the polyester fiberglass cover is 35% of the maximum dimension incrementRectangle: Table 3 |
| Elongation | 32% or more for thicknesses 0.049 in. (1.25 mm) and above 30% or more for thicknesses less than 0.049 in. (1.25 mm) |
| Springback | Polyester fiberglass covered bare wire: not more than 5ºPolyester fiberglass covered thick film insulation: not more than 5.5º |
Table2 Dielectric breakdown：
| Single | Double | ||||
| Thick film coated single layer polyester glass covering | Minimum Increase/mm | 0.178mm-0.229mm | BareDouble Glass Covered | Minimum Increase/mm | 0.203mm-0.305mm |
| Maximum Overall/mm | 1.930mm-8.661mm | Maximum Overall/mm | 1.930mm-8.738mm | ||
| Heavy Film-Insulated Double Glass Covered | Minimum Increase/mm | 0.279mm-0.381mm | |||
| Maximum Overall/mm | 2.507mm-8.865mm | ||||
Table 3
| Square AWG Size | 1-14AWG | |
| Bare wire size | Minimum/mm | 1.603mm-7.275mm |
| Nominal/mm | 1.628mm-7.348mm | |
| Maximum/mm | 1.654mm-7.422mm | |
| Radius (±25%) nominal | 0.40 ±25％ -1.0±25％ | |