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Litz Fiber & Tape Insulations

Insulation Recommended Max.
Operating Temperature		 Advantages Limitations
Cotton 105°C
  • Low cost serving.
  • Good resistance to abrasion.
  • Poor space factor compared to Nylon or Celanese.
  • Non-solderable.
Nylon 155°C
  • Good space factor.
  • Excellent abrasion resistance.
  • Solderable.
  • Hygroscopic
Dacron®
(POLYESTER)		 155°C
  • Good abrasion resistance.
  • Solderable.
  • Slightly higher maximum operating temperature than Nylon.
  • Better space factor than Cotton or Glass but poorer space factor than Nylon.
Nomex®
(HI-TEMP Aramid)		 250°C
  • Good space factor.
  • Good electrical properties at high temperatures.
  • Non-solderable.
  • Higher cost than other fibers.
Glass 260°C
  • Good electrical properties at high temperatures.
  • Space factor equivalent to Cotton.
  • Non-solderable.


Tape Insulation Recommended Max.
Use Temperature		 Characteristics
Polyester (PET)
Mylar®
(heat sealable
grades available)		 135°C
  • High dielectric strength.
  • Good abrasion often used as binder or moisture barrier under extruded jackets and textile serves or braids.
Nomex®
(aromatic polyamide) 		200°C
(Up to 220°C under
certain conditions.)
  • Excellent thermal properties.
  • Excellent electrical properties.
  • Excellent compatibility with varnishes, adhesives and transformer fluids.
  • Thinner grades are flexible.
  • Good resistance to tearing and abrasion.
Polyimide Kapton®
(Heat sealable & adhesive
grades available) 		240°C
(Up to 400°C under
certain conditions.)
  • Very high dielectric strength.
  • Very good chemial resistance.
  • UL 94 V-0 flame rating.
  • Excellent mechnical properties.
Fiberglass Cloth Ultimate operating
temperature determined
by application &
glass type.
  • Excellent electrical properties at high temperatures.
  • Conformable.
  • Varnish compatible grades available.
  • Excellent solvent resistance.
Mica Ultimate operating
temperature determined
by application &
glass type.
  • Excellent electrical properties at high temperatures.
  • Flame resistant.
  • Retains useful electrical properties during & after exposure to fire.

NOTE: Dacron®, Nomex®, Mylar®and Kapton®are DuPont Registered Trademarks.