Class 105 Polyvinyl Acetal Film-Insulated Square Aluminum Magnet Wire

Polyvinyl Acetal Film-Insulated Square Aluminum Magnet Wire is a special type of magnet wire, which is mainly characterized by its good oil resistance and hydrolysis resistance, making it widely used in the manufacturing of oil-immersed transformer windings.

Insulation materials

The conductor part of the Formvar enameled wire is usually pure aluminum metal, that has been annealed, and the surface is covered with an insulating film, which is typically made of polymer materials like polyvinyl formal (PVAl).

Specifications

Insulation materials	Polyvinyl Acetal
Thermal Class	105
Bare Wire Dimensions	Awg 1/0 – Awg14
Certificate	UL
Standard	MW-18-A

Heavy and Quad Film-Insulated Square Magnet Wire Increase in Dimensions Due to Film Coating

Square AWGSize	Bare Wire Dimensions			Radii (±25%)Nominal	Heavy		Quadruple
					Minimum Increase	Maximum Overall	Minimum Increase	Maximum Overall
	Minimum	Nominal	Maximum
1	7.275	7.348	7.422	1.00	0.080	7.549	0.127	7.600
2	6.477	6.543	6.609	1.00	0.080	6.736	0.127	6.787
3	5.768	5.827	5.885	1.00	0.080	6.012	0.127	6.063
4	5.138	5.189	5.240	1.00	0.080	5.367	0.127	5.418
5	4.575	4.620	4.666	1.00	0.080	4.793	0.127	4.844
6	4.074	4.115	4.155	0.80	0.080	4.282	0.127	4.333
7	3.630	3.665	3.701	0.80	0.080	3.828	0.127	3.879
8	3.231	3.264	3.297	0.80	0.080	3.424	0.127	3.475
9	2.878	2.906	2.934	0.67	0.080	3.061	0.127	3.112
10	2.563	2.588	2.614	0.67	0.080	2.741	0.127	2.791
11	2.278	2.304	2.329	0.50	0.080	2.456	0.127	2.507
12	2.027	2.052	2.078	0.50	0.080	2.205	0.127	2.256
13	1.803	1.829	1.854	0.40	0.080	1.981	0.127	2.032
14	1.603	1.628	1.654	0.40	0.080	1.781	0.127	1.831

Properties

Adherence and flexibility	No cracks visible in the film coating
Minimum Percent Elongation	MW Specification:18, 36, 64T ≥ 0.049: 15T < 0.049:15
Heat shock	No cracks visible in the film coating after conditioning at 175°C

Periodic conformance tests

Solubility	Specimens immersed in xylene shall not soften sufficiently to expose the bare conductor
Dielectric breakdown rated temperature	Average not less than 75% of the value required at room temperature, when tested on MW 15-A Heavy Build
Toluene / ethanol compatibility	No swelling or blistering in the film coating
Transformer oil resistance	No swelling or blistering in the film coatinga)Dielectric breakdown values shall average not less than the values in Table 36b)At least three of the five flexibility specimens shall show no cracks visible in the film coatingb) Elongation specimens shall show no swelling or blistering in the film coating