Superior performance for the world’s most demanding electrical applications
The DuPont™ Nomex® paper product family provides superior performance in transformers, motors, generators and many other types of electrical equipment. Every Nomex® product—from papers, pressboards and non-wovens to fabricated parts and more specialized forms like laminates and crepe papers—offers high levels of electrical, chemical and mechanical integrity. With performance that has stood the test of time through nearly 50 years of continuous use, the Nomex® paper product family offers a dependable answer to your unique material needs.
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Nomex® 910 is specifically designed for liquid-immersed transformers
During the traditional Chinese holiday known as the Spring Festival, power consumption in rural areas increases dramatically to more than 130%-140% of designed transformer capacity. The same occurs during the seeding and harvest season, resulting in overload, power failure and urgent rushes for repair. To change this situation, the State Power Grid issued the Technical Guidelines on High Overloaded Power Distribution Transformers in Rural Areas in June 2014.
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Electrical Insulation Systems Recognition Made Easy
Until recently, electrical insulation systems (EIS) recognition for electrical products was required only in the United States for manufacturers seeking recognition under Underwriters Laboratories (UL) 1446. However, with the adoption of IEC 61857 and IEC 61858 by International Electro-technical Commission (IEC) member nations, EIS recognition is now a global reality.
To meet the new standards, manufacturers must have a set of electrical insulation materials at their disposal that are tested and recognized before proceeding to end-product testing and certification.
A world leader for EIS
DuPont offers hundreds of pre-tested, globally approved UL/IEC electrical insulation systems. These approved systems, backed by application knowledge from our material science experts, can deliver significant cost and time savings. 
With our DuPont™ Nomex® papers and pressboard products, along with our wide range of high-performance films and fibers, DuPont is able to meet virtually all the electrical insulation requirements of today's transformers, motors, relays, switches, sensors and encapsulated coils and components.
Working hand-in-hand with our distributors, converters and molders, we’ve established a network capable of supplying world-class quality products and services virtually anywhere on the globe. And we continue to innovate, tailoring and improving material performance to meet emerging application requirements.
How can DuPont help?
DuPont offers a large number of UL-approved, IEC-recognized materials. What’s more, we provide manufacturers with free authorization to use a series of pre-approved EIS. These systems can save your company significant time and money by offering solutions that are recognized and ready for use in your end-product testing.
DUPONT PROVIDES MANUFACTURERS WITH FREE AUTHORIZATION TO USE A SERIES OF PRE-APPROVED ELECTRICAL INSULATION SYSTEMS (UL, IEC, ETC.).
DuPont™ Nomex® 864 LAM: Insulation Papers for Advanced Rotating Machine Technology
Advances in motor technology have presented new design challenges. The widespread use of voltage-conversion devices such as inverters, along with a general desire to pack more power into existing spaces through increased voltage, has spurred the need for electrical insulation materials that can stand up to ever-greater stresses. DuPont™ Nomex® 864 LAM was developed to help designers resolve these kinds of challenges.
Nomex® 864 LAM is a laminate-grade electrical insulation paper consisting of Nomex® meta-aramid and mica content and is a UL-recognized 220°C Class component included in existing UL systems. We offer it to official laminators with a nominal 2 mil (0.05 mm) and 3 mil (0.08 mm) thickness for lamination to films such as Mylar® (PET), Teonex® (PEN), Kapton® (PI), etc.
The Nomex® 864 LAM based laminate construction offers a significant improvement in voltage endurance over standard Nomex® based laminates, while maintaining its thermal stability, which is not found in non-DuPont, inorganic blend based laminates.
In tests on sheets of NMN flexible laminates, a construction made of Nomex® 864 LAM resulted in a 26x increase in pulsed voltage endurance compared to a standard Nomex® 464 LAM based construction. This test is similar to ASTM D2275, but is closer in nature to predict insulation performance when driven by a non-sinusoidal waveform such as an inverter output.
Total or partial benefits of Nomex® 864 LAM
For a typical 3-layer construction of NMN or NKN flexible laminate, it is possible to combine just one layer of mica-enriched Nomex® 864 LAM on one side, in conjunction with a standard laminate grade such as Nomex® 464 LAM on the other side. This will already provide partial voltage endurance performance benefits, while keeping mechanical protection on one side for applications that involve rough material handling. For maximum protection in high partial discharge applications, we recommend the use of Nomex® 864 LAM in both outer layers.
Additional benefits of Nomex® 864 LAM
Due to the ability of flexible laminates with Nomex® 864 LAM to work at increased voltage stress levels, a combination of reduced thickness and higher thermal conductivity can be exploited for improved thermal management of devices and/or efficiency gains.
The mica content improves the weight loss of the paper at excessive temperatures and acts as resistance to peak heat flows (thermal shocks), leading to raised temperature index of an insulation system.
The Limiting Oxygen Index (LOI) of flexible laminates made with Nomex® 864 LAM is substantially raised above 32%, a level required in certain critical rail traction applications for fire safety reasons (e.g., requirements for Hazard Level 3 per EN 45545-2).
The industry standard
Today, flexible laminate structures incorporating Nomex® layers are the industry standard for high temperature phase and ground insulation in motors, generators and transformers. Compared to other insulation materials, Nomex® 864 LAM offers a significantly increased ability to withstand high voltage spikes due to its inorganic mica content, and thus limit electrical degradation of insulation layers by partial discharges (PD). At the same time, it maintains the long-term thermal stability provided by its Nomex® meta-aramid content, which has provided electrical design engineers with peace of mind for half a century.
DUPONT DEVELOPED NOMEX® 864 LAM TO HELP RESOLVE NEW DESIGN CHALLENGES.
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