Hot Sale Class 105 Polyvinyl Acetal Film-Insulated Rectangular Aluminum Magnet Wire Fot Transformer Winding

Hot Sale Class 105 Polyvinyl Acetal Film-Insulated Rectangular Aluminum Magnet Wire Fot Transformer Winding

The Class 105 Polyvinyl Acetal Film-Insulated Rectangular Aluminum Magnet Wire is a popular choice for transformer winding applications due to its reliable insulation properties and efficient thermal performance.

 

Rated for a thermal class of 105°C, this magnet wire is suitable for moderate-temperature applications where stable performance and cost efficiency are key. The polyvinyl acetal film insulation provides good mechanical strength, durability, and resistance to abrasion, ensuring that the wire maintains integrity during winding and operation.

 

The rectangular aluminum structure enhances winding density and improves space utilization within transformers, making it an economical option for compact and efficient designs.

 

This wire is widely used in low- to medium-power transformers, electric motors, and other electrical devices that require dependable insulation at a lower cost compared to copper alternatives. Its popularity in the market is driven by its balance of performance, durability, and affordability, making it an excellent choice for a variety of electrical applications.

 

Insulation materials: Polyvinyl Acetal
Thermal Class: 105
Bare Wire Dimensions: width: 2mm-25mm, thickness: 0.8 – 10mm
Certificate: UL
Standard: MW-18-C

Formvar enameled flat copper wire Characteristics

Oil Resistance

Heat Shock Resistance

Mechanical Strength

Application Fields

Insulating Material

The coating is based on a blend of polyvinyl acetal and phenolic resins.

NOTE-Polyvinyl acetal in this case refers to the condensation product of polyvinyl alcohol and an aldehyde and includes polyvinyl formal (Formvar).

Table 1 Dimensions

Insulation materials	Polyvinyl Acetal
Thermal Class	105
Bare Wire Dimensions	width: 2mm-25mm, thickness: 0.8 – 10mm
Certificate	UL
Standard	MW 18-C

Table 2 Properties

Adherence and flexibility	No cracks visible in the film coating
Minimum Percent Elongation	MW Specification:18, 20, 36, 38, 64, 84T ≥ 0.049: 32T < 0.049:30
Heat shock	No cracks visible in the film coating after 30% elongation followed by conditioning at 150 ±3°C.
Springback	Not greater than 5°

Table 3 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-C 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 4a) At least three of the five flexibility specimens shall show no cracks visible in the film coatinga) Elongation specimens shall show no swelling or blistering in the filmcoating
Thermoplastic flow	Median not less than 180ºC, when tested as MW 15-C Heavy Build

Table 4 Dielectric Breakdown, Film-Insulated Rectangular and Square Magnet Wire

Film Insulation	Minimum Breakdown Voltage
	Any Three of Four Values	Fourth Value
Heavy	1500	500
Quad	2500	900

 

Materials:
Single enameled conductor
Polyvinyl acetal enameled rectangular copper conductor, index 120,155
Polyvinyl acetal over coated bondable epoxy resin rectangular copper conductor, index 120
Polyvinyl acetal enameled,hardened rectangular copper conductor
Polyvinyl acetal over coated bondable epoxy resin,hardened rectangular copper conductor
Polyesterimide enameled rectangular copper conductor, index 180
According to different electric insulation requirement to select Grade 1 enamel 0.08-0.11mm or Grade 2 enamel 0.12-0.16mm. Generally, epoxy resin increase of epoxy enameled rectangular wire is about 0.03-0.05mm.
Our company adopts medium wearing instrument (tgδ) to filter enameling technics, makes enamel solidify more perfect.
If special enamel thickness required or use other types enameled wire, please contact with us.
Soft copper used for enameled rectangular wire shall conform to GB5584.2-85,the resistivity is not more than 0.01724Ω?mm2/m at 20°.According to different mechanical strength, below proof stress Rp0.2is recommended:
C1 Rp0.2(>100~180)N/ mm2
C2 Rp0.2(>180~220)N/ mm2
C3 Rp0.2(>220~260)N/ mm2