Introduction
Class 105 Polyvinyl Acetal Film-Insulated Rectangular Aluminum Magnet Wire is a specialized winding conductor widely used in electrical equipment requiring moderate thermal resistance, excellent winding performance, and cost-effective electrical conductivity. As industries continue to pursue lightweight designs and improved manufacturing efficiency, aluminum magnet wire has become an increasingly attractive alternative to traditional copper conductors.
Among various insulation systems, Polyvinyl Acetal (PVA) enamel coating remains a reliable solution for low- and medium-temperature applications due to its excellent flexibility, adhesion, and dielectric properties. When combined with rectangular aluminum conductors, it creates a magnet wire that offers optimized space utilization, reduced weight, and competitive performance.
This article explores the structure, characteristics, manufacturing process, technical advantages, applications, and selection considerations of Class 105 Polyvinyl Acetal Film-Insulated Rectangular Aluminum Magnet Wire.
Specifications
| Insulation materials | Polyvinyl Acetal Film |
| Thermal Class | 105 |
| Bare Wire Dimensions | width: 2mm-25mm, thickness: 0.8 – 10mm |
| Insulation thickness(mm) | Heavy: width:0.064-0.114, thickness:0.076-0.127 Quad:width:0.102-0.152, thickness: 0.127-0.178 |
| Certificate | UL |
| Standard | MW-18-A |
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 |