✓ ISO 9001:2015 Certified

Enamelled Aluminium Wire

 BMI manufactures enamelled aluminium wire from EC-grade aluminium rod — in Class B and Class F thermal grades across a broad SWG range. The cost-effective, weight-saving alternative to enamelled copper wire for transformer windings, motor coils, and other winding applications where material budget and weight are critical design factors.

 
Enamelled Winding Wire
Product Overview

What Is Enamelled Aluminium Wire — And When Is It the Right Choice?

Enamelled aluminium wire is an electrical-grade (EC-grade) aluminium conductor coated with a continuous polymer enamel insulation — typically polyester, polyesterimide, or polyamide-imide. Like enamelled copper wire, the enamel film insulates adjacent conductor turns in a tightly wound coil, enabling efficient electromagnetic energy conversion in motors, transformers, and coils. The key distinction is the conductor material: aluminium instead of copper.

Also referred to as aluminium magnet wire or aluminium winding wire, enamelled aluminium wire offers two primary advantages over copper in specific applications: significantly lower material cost (aluminium is typically 60–70% less expensive than copper by weight) and lower density (aluminium is approximately one-third the density of copper), resulting in windings that are 30–35% lighter for a given conductor cross-section. These advantages make enamelled aluminium wire the standard choice for distribution transformer LV windings and a cost-effective option for certain motor coil applications.

At BMI Cables, we manufacture enamelled aluminium wire from EC-grade aluminium rod at our ISO 9001:2015 certified facility in Bhiwadi, Rajasthan. Conductor drawing, enamelling, and spool winding are performed in-house — with continuous spark testing during enamelling and a batch material test report (MTR) supplied with every order. Available in Class B, Class F, Class H and Class DC thermal grades to IS 13730 / IEC 60317.

~35% Lighter Than Copper Windings

EC-grade aluminium has roughly one-third the density of copper. For the same current-carrying cross-section, enamelled aluminium wire produces a winding that is 30–35% lighter — critical for weight-sensitive transformer designs and certain motor applications.

Significant Material Cost Saving

Aluminium conductor is typically 60–70% less expensive than copper by weight. For high-volume transformer and motor OEMs, switching LV windings to enamelled aluminium wire delivers substantial BOM cost reduction without compromising electrical performance when correctly designed.

EC-Grade Aluminium — Low Resistivity

Electrical-conductor grade (EC-grade) aluminium with minimum 99.5% purity minimises conductor resistivity — giving the best available electrical conductivity for an aluminium winding conductor.

Certified Thermal Classes

Class B (130°C), Class F (155°C), and Class H (180°C) enamelled aluminium wire — each manufactured with the specific enamel chemistry for that IS 13730 sub-standard. Not relabelled stock.

Wire Grades

Our Enamelled Aluminium Wire Range — Three Thermal Grades, One Certified Source

BMI manufactures enamelled aluminium wire across standard thermal classes. Each grade uses the specific enamel chemistry for that IS 13730 / IEC 60317 sub-standard — ensuring thermal class integrity is built in, not assumed.

 
 
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Key Features

What Makes BMI Enamelled Aluminium Wire the Reliable Choice

The performance parameters that define enamelled aluminium wire quality — built into BMI’s manufacturing process, not claimed after the fact.

 

EC-Grade Aluminium — Minimum Resistivity

Electrical-conductor grade aluminium with minimum 99.5% purity ensures the lowest achievable resistivity for an aluminium winding conductor — reducing I²R losses in transformer and motor windings.

30–35% Weight Saving Over Copper

Aluminium's low density (~2.7 g/cm³ vs copper's ~8.9 g/cm³) delivers significant winding weight reduction. Critical for large distribution transformer designs where transport weight is a cost factor.

Continuous In-Line Spark Testing

Every metre of enamelled aluminium wire is spark-tested during the enamelling process. Enamel pinholes are detected and eliminated before spooling — preventing insulation failures in service.

Tight Dimensional Tolerance

Conductor and overall enamelled diameter controlled within IS 13730 limits throughout production. Consistent wire dimensions ensure reliable automatic winding machine performance and accurate coil turn counts.

Thermal Class Integrity per Grade

Each thermal class uses the correct enamel chemistry — polyester for Class B, polyesterimide for Class F, PAI overcoat for Class H. No substitutions. Confirmed by batch test report per order.

Significant BOM Cost Reduction

Aluminium conductor is typically 60–70% lower cost than copper by weight. For high-volume distribution transformer and motor OEM production, switching to enamelled aluminium wire delivers measurable BOM savings.