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
Square Copper Magnet Wire
General Requirements
| Properties | Requirement |
| DIMENSIONS | Square Wire:Radii in accordance with 0.40-1.00mmThickness and width tolerances in accordance with 1.628-7.348mm Dimensions and increase in thickness: a. Single Polyester Glass Fiber Covered: in accordance with 1.628-8.252mm b.Double Polyester Glass Fiber Covered: in accordance with 1.930-8.738mm |
| 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: Square: 1.930-8.738mm |
| 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 Polyester Glass Fiber Covered: Square: 1.654-8.329mm Double Polyester Glass Fiber Covered: Square: 1.930-8.738mm |