Enameled Copper Aluminum Flat Wire

Our enameled copper and aluminum flat wires feature advanced insulation coatings with temperature ratings from 120°C to 240°C, delivering tailored solutions for transformers, motors, generators, and reactors.

• Temperature classes: 120°C (polyvinyl acetal) to 240°C (aromatic polyimide) with corresponding thermal shock ratings up to 300°C.

• Copper flat wire: 0.4–6mm × 2–16mm; aluminum flat wire: 0.8–5.6mm × 3–16mm; insulation thickness grades 1 and 2 available.

• Multiple coating options: polyvinyl acetal, polyester, modified polyester, polyesterimide, polyamide-imide, and polyimide composites.

• Superior oil resistance, hydrolysis resistance, thermal shock performance, and mechanical strength for diverse applications.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

Products Description

Enameled flat wire is manufactured by coating an annealed conductor-extruded or drawn from electrical round copper or aluminum rod through a rectangular die-with insulation varnish tailored to the required temperature index and compatibility per customer specifications. After baking, the insulation varnish forms an integrated layer with the conductor. This product is used in windings for transformers, generators, motors, reactors, and various electrical equipment coils.

Copper Flat Wire

Narrow side a: 0.4 mm – 6 mm

Wide side b: 2 mm – 16 mm

Aluminum Flat Wire

Narrow side a: 0.8 mm – 5.6 mm

Wide side b: 3 mm – 16 mm

If specifications fall outside the above range, please contact us.

The insulation thickness shall be produced according to the following table or as mutually agreed.

Technical Parameter

Insulation Thickness Grade	Insulation thickness (mm)
Insulation Thickness Grade	Min.	Nominal Value	Max.
1	0.06	0.085	0.11
2	0.12	0.145	0.17

Enamelled flat wire performance parameters table
Product	QQB-120	QZB-130	QZGB-155	QZYB-180	QZY/XYB-200	QXYB-220	QY(F)B-240
Product	Polyvinyl acetal enameled flat wire	Polyester enameled flat wire	Modified polyester enameled flat wire	Polyesterimide enameled flat wire	Polyesterimide/ polyamide-imide composite enameled flat wire	Polyimide enameled flat wire	Aromatic polyimide enameled flat wire
Standard	IEC60317-18	GB/T7095.7-2008	IEC60317-16 GB/T7095.3-2008	IEC60317-28 GB/T7095.4-2008	MW-36C IEC60317-29 GB/T7095.6-2008	IEC60317-30 MW38-C	Mw20 IEC60317-47 GB/T7095.5-2008
Heat-resistant class	120℃	130℃	155℃	180℃	200℃	220℃	240℃
Top coat	PolyvinylAcetal	Polyester	Modified polyester	Polyester imide	Polyester imide	Polyimide	Aromatic-Polyimide
Undercoat					Polyamide-Imide
Production specifications	a:0.80-5.60mm b:2.00-16.00mm
Performance	Excellent resistance to transformer oil and mechanical abrasion, combined with superior flexibility, adhesion, and hydrolysis resistance.	Enhanced oil-heat resistance, improved hydrolysis resistance, strong scratch resistance, excellent adhesion, and good flexibility.	Good heat resistance, excellent oil resistance, high hydrolysis resistance, superior flexibility, and strong scratch resistance.	Very good heat resistance, excellent oil resistance, strong chemical resistance, high hydrolysis resistance, and superior thermal shock resistance.	High heat resistance, strong chemical resistance, good scratch resistance, excellent resistance to cryogenic temperatures, and superior radiation resistance.	Excellent heat resistance, strong chemical resistance, high scratch resistance, superior high-temperature breakdown voltage, excellent thermal shock resistance, and low-temperature radiation resistance.	Maximum heat resistance, optimal solvent resistance and mechanical strength, excellent resistance to refrigerants, and superior radiation resistance.
Application	Mainly used in oil-immersed transformers.	Dry-type or oil-immersed transformers and other electrical equipment.	Dry-type or oil-immersed transformers and other electrical equipment.	High and low voltage DC/AC motor electromagnetic coils, dry-type or oil-immersed transformers.	High and low voltage DC/AC motor electromagnetic coils, dry-type or oil-immersed transformers, automotive coils, and rail transit coils.	High-temperature motor windings, dry-type transformers, sealed relays, and electronic components.	Various types of electrical equipment operating above 220°C, such as aviation motors, mining and deep-sea motors, generators, nuclear industry motors, and all kinds of electrical equipment requiring superior high-temperature performance.
Thermal shock	140℃	155℃	175℃	200℃	220℃	240℃	300℃

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