180 Nomex

Whenever there's a need for electrical insulation, there's usually a product of DuPont™ NOMEX® meta-aramid to fill it. In its various forms - primarily papers and pressboards - parts made from NOMEX® have the right balance of properties for use in transformers, motors, generators and other electrical equipment. This unique balance of properties has been providing reliability to manufacturers for over 25 years.

NOMEX® is a synthetic aromatic polyamide polymer that provides high levels of electrical, chemical and mechanical integrity, when converted in to its various sheet forms. Used properly, NOMEX® products can extend the life of electrical equipment, reduce premature failures and repairs and act as safeguard in unforeseen electrical stress situations.

Excellent electrical insulator that also supports a wide temperature range, it can be used in switchgear, transformers and consumer electronics…


Products made from NOMEX® have characteristics which make them ideally suited for electrical insulation applications. These characteristics may vary slightly in the different forms and types of NOMEX®. The following provides a comprehensive look at NOMEX® and explains the advantages of specifying it in a broad range of electrical applications.
Inherent dielectric strength In densified form, NOMEX® meta-aramid parts withstand short term electrical stresses of
  18 to 40 kV/mm (450-1000V/mill) depending on product type and thickness, with no need for further treatment with varnishes or resins.
Mechanical toughness Parts made from Densified NOMEX® are strong, resilient and (in the thinner grades) flexible
  with good resistance to tearing and abrasion.
Thermal stability Temperatures up to 200°C (290°F) have little or no effect on the electrical properties of
  Products made from NOMEX® and useful values are retained at considerably higher temperatures. Furthermore these useful properties are maintained for at least 10 years of continuous exposure at 200°C (430°F).
Chemical compatibility NOMEX® is essentially unaffected by most solvents and is unusually resistant to attack by
  acids and alkalies. It is compatible with all classes of varnishes and adhesives, transformer fluids, lubricating oils and refrigerants. Since NOMEX® products are not digestible, they are not attacked by insects, fungi or molds.
Cryogenic Capabilities NOMEX® has found acceptance in a variety of cryogenic applications due to its unique
  polymeric structure. At the boiling point of nitrogen (77°K), NOMEX® Type 410 paper as well as Type 993 and Type 994 pressboard have tensile strengths in excess of room temperature values.
Moisture insensitivity In equilibrium at 95 % relative humidity, densified NOMEX® papers and pressboards maintain
  90% of their bone-dry dielectric strength while many mechanical properties are actually improved.
Radiation resistant NOMEX® is essentially unaffected by 800 megarads of ionizing radiation (which causes
  polyester laminates to crumble) and still retains useful mechanical and electrical properties after eight times this exposure.
Non-toxic/flame resistant Parts made from NOMEX® will not produce any known toxic reactions in humans or animals.
  Parts made from NOMEX® do not melt and with a Limiting Oxygen Index (LOI) at 220°C (430 °F) above 21 (the critical value for combustion in normal air), they do not support combustion even at the highest operating temperatures. NOMEX® parts can be made which meet UL94V-0 requirements.


NOMEX® aramid paper Type 410


DuPont™ and Nomex® are trademarks or registered trademarks of E.I. du Pont de Nemours and Company


Thermal Insulation

Thermal Insulation is normally requested for two reasons; firstly when electrical insulation is required to work in high temperature ranges, secondly when there is need to prevent the loss of heat from a system


Electrical Insulation

Electrical insulation is chosen for its ability to resist the flow of electricity, nonconductive, it can be supplied in flexible thin films, thicker flexible laminates or rigid laminates and can be offered to suit various temperature ranges.