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High-Temperature Resistant Nomex Paper Insulated Wire - China Suppliers and Factory for Copper and Aluminum Flat Wire

Paper covered copper (aluminum) flat wire is a specialized winding solution manufactured from high-quality oxygen-free copper rods or electrician circular aluminum rods. These rods are processed through extrusion and wire drawing techniques, and then coated with insulation paper according to specific industry standards. Our paper covered wire is primarily utilized in the winding of oil-immersed distribution transformers and power transformers. As a leading supplier and factory in China, we offer customizable insulation paper options to meet the unique requirements of our customers. Choose us for reliable and efficient wire solutions tailored to your needs

    Technical Parameter
    NOMEX Covered Wire Technical Standards: The NOMEX used by our company is made by DuPont USA T410 NOMEX. The thickness is 2 mils.
    Product Wrapping Process Number of Wraps Insulation Thickness / mm Breakdown Voltage ≥
    Nomex 1.5–2mm self locking Lapping 1 0.12 ± 0.05 600V
    1.5–2mm self locking Lapping 2 0.24 ± 0.05 1500V
    50% lapping 50% 1 0.22 ± 0.05 1200V
    50% lapping 50% 2 0.4 ± 0.05 1300V
    1.5mm Reverse lapping 3 0.33 ± 0.05 2500V
    Product Information
    Advantages of Nomex Wrapped Wire
    Outstanding Properties

    NOMEX has extremely high electrical, chemical, and mechanical properties. It offers excellent elasticity, flexibility, anti-tearing, moisture resistance, and wear resistance, as well as acid and alkali corrosion resistance.

    🔥 Strong Thermal Resistance

    Even when the temperature reaches 220℃, the insulation property remains unchanged. Transformers with Nomex wrapped wire deliver strong thermal stability throughout their service life.

    💰 Lower Cost & Lighter Weight

    Transformers with Nomex insulation can operate at up to 180℃, requiring fewer wires and ferrite cores. This results in smaller size, lighter weight, reduced installation costs, and lower no-load loss.

    🛡️ Broad Compatibility

    Nomex is compatible with all kinds of varnish, adhesive, transformer liquid, lubricant, and coolant. It is not easily destroyed by insects, molds, or fungi.

    Product Description
    Reliability Improvement

    With Nomex wrapped wire, outstanding electrical and mechanical properties are maintained throughout the transformer's entire service life. It resists aging, maintains strong contraction and elasticity, and ensures winding remains close with no cracking. Nomex insulation is not sensitive to temperature or dust, improving overall reliability.

    📈 Increased Reserve Capacity

    Nomex's high thermal resistance maintains insulation properties even at 220℃. Rank C (220℃) replaces Rank H (180℃) in transformer design, allowing it to handle urgent load situations and unexpected overloads — significantly reducing the need for backup planning.

    🌿 Good Environmental Performance

    NOMEX is chemically stable, safely flame retardant, and radiation resistant. Even in a fire, it does not release toxic gases. It does not react with solvents and resists acid and alkali corrosion. At the end of its service life, it is conveniently recyclable and will not cause environmental pollution — making Nomex a truly environmentally friendly high-tech product.

    Frequently Asked Questions
    Q
    What NOMEX material does your company use for covered wire production?
    Our company uses DuPont USA T410 NOMEX with a thickness of 2 mils. This premium material ensures outstanding electrical, mechanical, and thermal performance in all our NOMEX covered wire products.
    Q
    What is the maximum breakdown voltage achievable with NOMEX covered wire?
    The highest breakdown voltage in our standard range is 2500V, achieved using a 1.5mm reverse lapping process with 3 wraps and an insulation thickness of 0.33 ± 0.05mm.
    Q
    What temperature can transformers using Nomex wrapped wire withstand?
    Transformers using Nomex wrapped wire can operate at temperatures up to 220℃ (Thermal Class C) while maintaining consistent insulation properties. This makes them highly suitable for demanding high-temperature applications that traditionally required Class H (180℃) designs.
    Q
    How does Nomex wrapped wire improve transformer reliability?
    Nomex wrapped wire is highly resistant to aging and maintains strong contraction and elasticity over time, ensuring that transformer windings remain tight with no cracking. Additionally, Nomex insulation is not sensitive to temperature fluctuations or dust accumulation, which significantly extends transformer service life and reliability.
    Q
    Is NOMEX covered wire environmentally friendly?
    Yes. NOMEX is chemically stable, safely flame retardant, and does not release toxic gases even in fire conditions. It is resistant to solvents, acids, and alkalis. At end-of-life, it is conveniently recyclable, its waste can be degraded, and it causes no environmental pollution — making it a truly green, high-tech insulation material.
    Q
    What are the main economic benefits of using Nomex insulated transformers?
    Transformers using Nomex insulation require fewer wires and ferrite cores, resulting in smaller size and lighter weight. This reduces capital construction and installation expenses. A smaller ferrite core also means lower no-load losses, providing long-term operational savings in addition to the upfront cost benefits.

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