SpiralGuard in Nomex® 410 – 411 – 464 – 864 and Mylar® DuPont™

Thermal Class: F–H

SpiralGuard in Nomex® is the Politubes range of DuPont Nomex® aramid paper tubes (grades 410, 411, 464, 864), engineered for high-temperature electrical insulation and mechanical protection of conductors, windings, and electromechanical components.
They ensure dimensional stability, flame resistance, and consistent dielectric performance up to 220 °C.

Available in various thicknesses and densities, SpiralGuard in Nomex® are the ideal choice for electric motors, transformers, and traction systems.

If you are looking for a premium insulating sleeve or cap designed for demanding environments — including high temperatures, high voltages, or chemically aggressive conditions — Nomex® is the ideal candidate.

SpiralGuard in Nomex® are custom-made and ready to use.

Available materials and configurations:
  • Nomex® 410 – High-density aramid paper with excellent dielectric strength, mechanical resistance, and flexibility. Generally used as a standalone material.
  • Nomex® 411 – Low-density version of 410, compliant with IEC 60819-3-3 (Type 3), ideal for heat-shrinkable applications.
  • Nomex® 464 – Designed for laminates with polyester Mylar® (Nomex®–Mylar®–Nomex®) or polyimide Kapton® (Nomex®–Kapton®–Nomex®); compliant with IEC 60819-3-3 (Type 4).
  • Nomex® 864 – Aramid paper with mica reinforcement, developed for inverter-driven motors and applications up to 800 V; excellent partial discharge resistance and suitable for EV battery insulation.
  • Mylar® DuPont™ – Transparent polyester film with outstanding mechanical, chemical, and moisture resistance.

Nomex®–Mylar® tubes and caps can be supplied as:

  • Spiral-wound tubes
  • Ultrasonically or heat-sealed end caps
  • Heat-shrinkable versions (Nomex® 411 + Mylar® HS + Hostaphan® 2MSO/2LSO), with a shrink ratio between 12 % and 35 %.
Key Advantages
  • Continuous operation up to 220 °C in UL-recognized systems
  • Excellent dielectric strength and mechanical properties
  • Resistance to solvents, acids, alkalis, and radiation
  • Outstanding resin impregnation capability
  • Reliable thermal, electrical, mechanical, and chemical barrier
  • Maintains flexibility and insulation performance even after shrinking
  • Available in heat-shrinkable versions
  • Fully customizable to customer specifications

Politubes’ adhesive systems, refined through over 50 years of experience, comply with REACH and RoHS regulations and ensure full preservation of the original insulating properties of the materials.

MAIN APPLICATIONS

  • Electrical insulation of connections and wiring harnesses
  • Motors, generators, and inverter systems
  • Transformer tie rods and leads
  • Equipment exposed to harsh environments, high voltage, and long-term thermal stress
  • Cathodic protection against galvanic corrosion (flanges and bolts)
  • Traction motors and EV battery packs
  • Motor terminals, junctions, and solder joints
  • Coil windings, hermetic compressors, and pump insulation
  • Crimped joints and electrical terminations
  • Electrical equipment for high-altitude operation
  • Sensors, thermistors, thermostats, and thermal protection devices
Technical Support

Politubes engineers provide tailor-made solutions and dedicated technical assistance to meet the specific requirements of each application.

Nomex® is a registered trademark of DuPont

NOMEX® – MYLAR® TUBES & ENDCAPS TECHNICAL SPECIFICATION
Inside diameter From 1.8 to 123 mm
Thickness From 0.12 to 1 mm
Length From 6 to 6000 mm – Tubes rewound in rolls can reach 1000 meters length
Types of insulation end caps available Ultrasonic welded; ultrasonic dot welded; bullnose
Color White, coloured or with a helical coloured stripe for fast code identification
Dielectric strength Nomex® 411 – 130 micron 12 kV/mm – ASTM D149
Dielectric strength Nomex® 410 – 50 micron 430 V/mil – ASTM D 149
Dielectric strength Nomex® 410 – 80 micron 550 V/mil – ASTM D 149
Dielectric strength Nomex® 864 – 50 micron 558 V/mil – ASTM D 149
Dielectric strength Nomex® 864 – 80 micron 635 V/mil – ASTM D 149
Dielectric strength Mylar® A DuPont Up to 19 kV for the 250µ – ASTM D149
Dielectric strength Mylar® HS DuPont 3,5 kV – ASTM D149
Service temperature Nomex® – Mylar® tubes & caps – 55 °C to +165 °C
Melting point 254 °C
Service temperature Nomex tubes – 55°C to 220°C

Nomex® UL certification is nr E34739. Mylar® UL certification is nr E93687. Politubes will provide specific tubes & caps technical data sheet accordingly with sizes requested. Nomex® is a DuPont Registered Trademark. Mylar® is a DuPont Registered Trademark.