Nomex 418 is a high performance organic electrical insulation paper which offers high dielectric strength, mechanical toughness and outstanding resilience. Manufactured by DuPont® this grade is specifically designed for high-voltage applications including motor conductor and coil wrap, transformer ground and layer insulation. Nomex 418 utilizes a calendered blend of aramid and mica allowing it to offer increased voltage resistance when compared to the standard grade Nomex 410.
The combination of outstanding electrical properties, mechanical strength and thermal endurance (UL recognised as 220ºC insulation) have led to Nomex 418 being employed in a wide range of applications. The increased voltage endurance of this grade is at least equivalent to to the best inorganic insulation and greatly superior to other organic materials. This has led to the material being used extensively to insulate stator coils in AC motors up to 13.6 kV.
This combination of benefits is enhanced even further through Nomex 410’s compatibility with virtually all classes of electrical varnishes and adhesives as well as transformer fluids, lubricating oils and refrigerants. Solvents such as water have a plasticizing effect on Nomex 418, reducing its tensile strength but also increasing break elongation and conformability which can be advantageous in some applications. These effects are reversed once the paper is dried or baked.
AG offers Nomex 418 by the roll, metre or kilogram. It is available in 5 thicknesses between 0.08mm – 0.36mm thick. Standard roll width is 914mm wide and roll length varies depending on thickness. AG can also supply Nomex 418 as slit tapes, with or without adhesive backing and as custom components in intricate shapes.
As official agents for DuPont®, AG has the access, stock and knowledge needed to be able to assist with your application. For more information on the full range of options available, please don’t hesitate to contact your local AG office.