Class 155 Polyester Glass Fiber Covered Heavy Film-Insulated Square Copper Magnet Wire

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 specification of Polyester Film-Insulated 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

Dimensions

Table 1 Heavy and Quad Film-Insulated Square Magnet Wire Increase in Dimensions Due to Film Coating (mm)

Radii (±25%)Nominal	Heavy		Quadruple
	Minimum Increase	Maximum Overall	Minimum Increase	Maximum Overall
1.00	0.080	7.549	0.127	7.600
1.00	0.080	6.736	0.127	6.787
1.00	0.080	6.012	0.127	6.063
1.00	0.080	5.367	0.127	5.418
1.00	0.080	4.793	0.127	4.844
0.80	0.080	4.282	0.127	4.333
0.80	0.080	3.828	0.127	3.879
0.80	0.080	3.424	0.127	3.475
0.67	0.080	3.061	0.127	3.112
0.67	0.080	2.741	0.127	2.791
0.50	0.080	2.456	0.127	2.507
0.50	0.080	2.205	0.127	2.256
0.40	0.080	1.981	0.127	2.032
0.40	0.080	1.781	0.127	1.831

Table 2 Single/Double Polyester Glass Fiber Covered, Bare or Heavy Film-Insulated Square Copper Magnet Wire—Minimum Increase and Maximum Overall Dimensions Due to Insulation (mm)

Heavy Film-Coated SinglePolyester Glass Covered		Heavy Film-Insulated DoubleGlass Covered
Minimum Increase	Maximum Overall	Minimum Increase	Maximum Overall
0.229	8.661	0.381	8.865
0.229	7.747	0.381	7.950
0.203	6.909	0.381	7.137
0.203	6.198	0.381	6.426
0.203	5.563	0.381	5.766
0.203	4.978	0.356	5.182
0.203	4.445	0.356	4.674
0.203	3.988	0.330	4.191
0.203	3.581	0.305	3.759
0.203	3.226	0.305	3.404
0.178	2.870	0.279	3.048
0.178	2.591	0.279	2.743
0.178	2.337	0.279	2.489
0.178	2.134	0.279	2.261
0.178	1.930	0.279	2.057

General Requirements

Properties	Requirement
DIMENSIONS	Square Wire:Radii in accordance with 0.40-1mm (±25%)Thickness and width tolerances in accordance with Table 1Dimensions and increase in thickness in accordance with Table 2
ADHERENCE AND FLEXIBILITY	Single or Double with underlying film: no cracks visible in the film insulation after 20% elongation. Examine with normal vision and without removing the polyester glass fiber covering.NOTE—The minimum thickness of the polyester glass fiber covering is 35% of the maximum increase in dimensions calculated from: Table 2
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 Heavy film-insulated: not greater than 5.5º
DIELECTRIC BREAKDOWN	Not less than 90 V/mil (3543 V/mm) of the minimum thickness of the glass fiber covering on one side plus the minimum breakdown given in Table 36 for the film-insulated wire, if applicable.NOTE—The minimum thickness of the glass fiber covering is 35% of the maximum increase in dimensions calculated from: Table 2