Processing of Nomex

  • Insulation class H (up to 180 ° C)
  • Calendered or non-calendered aramid paper
  • Low flammability
  • Good dielectric strength
  • Good durability at low temperatures
  • Good resistance to acids and alkalis


NOMEX® is a synthetic aromatic polyamide polymer (aramid) which is characterised by a particularly stable molecular structure.

This results in the excellent dielectric, thermal, chemical and mechanical properties of NOMEX® and opens up a wide range of applications for NOMEX® products.

As surface insulating materials, NOMEX® papers and pressboards have been used for more than 35 years in transformers, motors, generators and other electrical equipment, proving their overload capacity and high reliability even under extreme operating conditions.

NOMEX® paper is made from two forms of aramid polymer, the fibrids (as binding particles) and the flakes in a papermaking process (type 411). In a second step, a high temperature calendering process is used to achieve high densification and cross-linking of the NOMEX® papers (types 410, 414, E56, 418).

Thermal stability

Nomex is UL-approved (file number: E34739) for use in electrical machines at continuous operating temperatures of up to 220 °C, whereby the properties remain almost unchanged even in continuous operation (UL 546 B).

Short-term (over hours) operation of machines insulated with Nomex is also possible at significantly higher temperatures.

Flame retardant, self-extinguishing

NOMEX® aramid paper products do not melt and with a LOI (Limited Oxygen Index) value of over 20.8 at 220 °C (the critical value for combustion in normal air) they do not support combustion (UL 94 V-O).

High mechanical stability (tensile strength, stiffness, tear and tear propagation resistance, bending stability).

Inherent dielectric strength: Nomex allows short term stresses from 18 to 40 kV/mm, possible without further treatment with varnishes or resins

Chemical resistance: NOMEX® is exceptionally resistant to acids and alkalis and is compatible with all types of paints, adhesives, transformer fluids, lubricating oils and coolants.

Low temperature properties: Due to its unique polymer structure, NOMEX® is used in a wide range of low temperature applications.

Aramid paper insulation tubes

We wind tubes from Nomex® 410 which can then be used to insulate bolts or connections.

These insulating tubes can be manufactured in a wide range of diameters.

Types available through Dr. Dietrich Müller GmbH

NOMEX® Type 410

Calendered high density standard type.


Groove cover slides, groove liners, end plates, layer insulation in transformer construction, stamped parts, adhesive tapes.

Available thicknesses:

0.05 mm, 0.08 mm, 0.13 mm, 0.18 mm,

0.25 mm, 0.30 mm, 0.38 mm, 0.51 mm,

0.61 mm, 0.76 mm

Widths according to your requirements from

5 - 914 mm


NOMEX® Type 411

Uncalendered, soft, absorbent type.


Phase insulation, intermediate layer in transformer construction, adhesive tapes.

Available thicknesses:

0.13 mm, 0.18 mm, 0.25 mm, 0.38 mm, 0.58 mm

Widths according to your requirements from

5 - 965 mm


NOMEX® Type 414

Similar to type 410, more flexible, therefore more malleable with a more open surface and better absorbency compared to type 410.


Phase insulation, cover insulation, groove insulation, layer insulation.

Available thicknesses:

0.18mm, 0.25mm, 0.30mm, 0.38mm

Widths according to your requirements from

5 - 914 mm


NOMEX® Type T993

Medium density, mouldable, good absorbency.


Production of winding cores and spacers in transformer construction

Available thicknesses:

1.0 mm, 1.5 mm, 2.0 mm, 2.4 mm, 3.0 mm, 4.0 mm


NOMEX® Type T994

Highly compressed, mechanically high-strength


Spacers, strips, spacer rings in transformer construction, soldering pads, ultrasonically welded strip mats.

Available thicknesses:

1.0 mm, 1.5 mm, 2.0 mm, 3.0 mm, 3.2 mm, 4.0 mm, 4.8 mm, 5.0 mm, 6.0 mm, 6.4 mm, 7.0 mm, 8.0 mm, 9.6 mm


NOMEX® Type N196

Article only available as remaining stock

Uncalendered, soft, absorbent type.


Phase insulation, intermediate layer in transformer construction.

Available thicknesses:

0.38 mm (only as remaining stock)

Where to buy Nomex

Nomex can be purchased from us or from our dealers and distributors. You will find our distributors in almost all countries and regions of the world.