Fire Retardant Aramid Paper Calendered Polyamide Insulating Paper Nomex Paper Original and Alternative

Feature of Aramid Paper:

• High Mechanical Strength – Provides excellent durability and resistance to tearing, suitable for demanding insulation applications.

• Outstanding Dielectric Strength – Ensures reliable electrical insulation for motors, transformers, batteries, and high-voltage devices.

• Wide Thickness Range – Available in 9 thicknesses (2–30 mil / 0.05–0.76 mm) to meet different application requirements.

• Superior Thermal Stability – Can operate continuously at high temperatures and withstand short-term overloads up to 200–260℃.

• Excellent Flexibility & Resilience – Easily conforms to irregular shapes and maintains integrity after repeated bending or stress.

• Overload Resistance – Maintains stable insulation performance under short-term overvoltage or thermal shock.

• Long Service Life – Delivers reliable performance under harsh environments, extending equipment lifespan.

• Eco-Friendly & Safe – Non-toxic and halogen-free, meeting international safety and environmental standards.

Applications of Aramid Insulation Paper:

Aramid paper is widely used in the electrical and electronics industry due to its excellent dielectric strength, thermal resistance, and mechanical durability. It is a preferred insulation material for high-performance equipment that requires long-term stability under extreme conditions.

• Motor Insulation – Used as slot liner, phase insulation, and turn-to-turn insulation in electric motors for enhanced thermal endurance and efficiency.

• Transformer Insulation – Applied in dry-type and oil-filled transformers as interlayer insulation, wrapping, and spacers to ensure long-lasting reliability.

• Battery Insulation – Provides thermal and electrical protection in lithium-ion, EV, and energy storage batteries to improve safety and performance.

• Generator and Reactor Insulation – Ideal for high-voltage generators, reactors, and power systems requiring superior heat resistance and overload protection.

• Flexible Laminates – Commonly combined with films such as polyester (PET) or polyimide (PI) to produce flexible composite insulation materials.

• Electronics & Aerospace – Used in circuit protection, high-temperature shielding, and aerospace insulation systems where mechanical strength and safety are critical.

• Cables & Wires – Serves as a wrapping and separating layer for high-voltage cables and specialized wires.

What is DuPont Insulating Paper:​

DuPont insulating paper, with Nomex as a well – known product line, is a high – performance insulating material made from aramid fibers. Aramid fibers are aromatic polyamide fibers, which endow the paper with outstanding properties. The manufacturing process involves advanced techniques to ensure the quality and performance of the final product.

Key Properties of DuPont Insulating Paper:

High – Temperature Resistance​

DuPont insulating paper can withstand high temperatures. For example, it can maintain good insulating properties continuously at 220 °C for 10 years and does not shrink, embrittle, soften or melt during short – term exposure to temperatures as high as 300 °C. This high – temperature durability is crucial for applications in high – temperature environments, such as in motors and transformers.​

 Excellent Electrical Insulation​

It offers high inherent dielectric strength. This property enables it to endure electrical stresses effectively. In applications like hybrid electric vehicles (HEVs), where inverters create specific electrical conditions, DuPont insulating paper can withstand the resulting electrical stresses, ensuring the safety and proper functioning of electrical systems.​

Superior Mechanical Strength​

The paper has excellent mechanical toughness, flexibility, and resilience. In harsh operating conditions, such as in steel mill drives, railway traction, and automotive motors, which are subject to severe shock and vibration, the mechanical strength of DuPont insulating Chemical and Radiation Resistance​

It shows good resistance to chemicals and radiation. This makes it suitable for use in various industrial and special environments where exposure to chemicals or radiation may occur.

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 Common Models of DuPont Insulating Paper: ​

Nomex 410​

• Properties: It is a high – density paper with excellent mechanical and electrical strength. It is available in 11 thicknesses ranging from 0.05 to 0.76 mm (2 to 30 mil).​

• Applications: Widely used in electrical equipment applications, such as motor phase insulation and transformer coil end filler. In motor insulation, it helps to improve the reliability and extend the service life of motors. In transformers, it contributes to the overall performance and safety of the equipment.​

Nomex 411​

• Properties: An uncalendered paper with low density, a high degree of absorption, and relatively lower dielectric strength than Nomex 410.​

• Applications: It is used where high bulk and conformability, along with increased impregnability and saturability, are of prime importance. For example, in cast resin applications as turn and layer insulation, it can better absorb resins and ensure a more uniform and effective insulation structure.​

Nomex 418​

• Properties: Designed specifically for high – voltage applications.​

• Applications: Perfect for motor conductor and coil wrap, as well as transformer ground and layer insulation in high – voltage systems. It can effectively withstand the high – voltage electrical stresses in these applications.​

Nomex 910​

• Properties: A unique insulating material comprised of high – quality, electrical – grade cellulose pulp and web – like binders made from the same high – temperature polymer as other Nomex papers. Its physical and electrical properties are between Nomex 410 and cellulosic papers.​

• Applications: Specifically designed for use in liquid – immersed transformers. When higher elasticity is needed for wire wrapping applications in such transformers, Nomex 910 insulating crepe paper can meet these requirements.​

Nomex 200 Series​

• Properties: Fulfills Underwriters Laboratories (UL) 94 V – 0 requirements, provides excellent tear and puncture resistance, features thermal stability at temperatures up to 392 °F (200 °C) (far exceeding the market need for 248 °F (120 °C)), offers chemical compatibility with all classes of varnishes and adhesives, and is unaffected by lithium – ion battery electrolyte leaks.​

• Applications: Used in battery packs and electronic applications. For example, in LCD televisions, it can be used as the insulation barrier, or “firewall,” between the power module board and the cover plate. In smart – phone micro – speakers, it can be used as a diaphragm suspension damper to improve sound generation.

Specifications of Aramid Insulation Paper:

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