Insulating Material
The fiber covering shall consist of a combination of polyester and glass fibers. The glass fibers shall be electrical-grade continuous-filament glass yarn. The polyester fiber shall be a high-grade yarn resulting from the linear polymerization of ethylene glycol and terephthalic acid.
The maximum content by weight of polyester fiber in the yarn shall not exceed 50%. If underlying film coating is used, it shall have at least a class 130 rating and comply with the applicable specification of Polyester Film-Insulated Rectangular and Square Copper Magnet Wire Thermal Class 155. The polyester glass fiber covering shall be wrapped firmly, closely, evenly, and continuously around the wire. The polyester glass fiber covering shall be unvarnished and fused.
Thermal Class
155℃
Conductor
Rectangular Copper Magnet Wire
General Requirements
| Properties | Requirement |
| DIMENSIONS | Rectangular Wire: Radii in accordance with 0.51-0.99mm (Full Rounded Edge) Thickness tolerances in accordance with ±0.001mmWidth tolerances in accordance with ±0.025-0.076mm Dimensions and increase in thickness in accordance with: —Single Covering of Polyester Glass Fiber: 0.0045-0.0070 inches —Double Covering of Polyester Glass Fiber: 0.0095-0.0135 inches |
| ADHERENCE AND FLEXIBILITY | Double without underlying film: Not less than 75 V/mil (2950 V/mm) of mini- mum thickness of the polyester glass fiber covering on one side NOTE—The minimum thickness of the polyester glass fiber covering is 35% ofthe maximum increase in dimensions calculated from: —Single Covering of Polyester Glass Fiber: 0.0050-0.0080 inches —Double Covering of Polyester Glass Fiber: 0.0110-0.0160 inches |
| ELONGATION | Not less than 32% for a thickness of 0.049 in. (1.25 mm) and greater, or 30% for a thickness less than 0.049 in. (1.25 mm) |
| SPRINGBACK | Polyester glass fiber covered bare: not greater than 5º |
| DIELECTRIC BREAKDOWN | Not less than 90 V/mil (3543 V/mm) of the minimum thickness of the glass fiber covering on one side NOTE—The minimum thickness of the glass fiber covering is 35% of themaximum increase in dimensions calculated from: Single Covering of Polyester Glass Fiber: rectangular: 0.0050-0.0080 inches Double Covering of Polyester Glass Fiber: rectangular without underlying film: 0.0110-0.0160 inches |