NANUQ ® Electrical Insulation


Epoxy Insulation

Nanuq® Electrical Insulation

CTD provides epoxy-based insulations that provide high strength and toughness at cryogenic temperatures. Products such as CTD-101K have been used to produce some of the most advanced superconducting magnets in the world, and continue to be used in new devices under development. CTD offers insulation products for use with vacuum pressure impregnation, prepreg, and wet-winding processes.

Typical processing parameters are shown below, however these systems can be modified with the addition of fillers. Please contact us regarding customized solutions.

Resin System
Description Process Temp Viscosity
Working Time
CTD-101G Alumina-filled potting resin 60° C

23,000 cP

8 hrs
CTD-101K Low viscosity and long pot life

Excellent for impregnation of large coils

40° C 400 cP 60 hrs
CTD-121P Prepreg system

Available in a variety of forms

22° C N/A 1 yr
CTD-521 Low viscosity and room temperature cure

Best for wet winding processing

25° C <1000 cP 6-8 hrs
CTD-522 Similar to CTD-521

Shorter pot life and faster cure

25° C <1000 cP 3-4 hrs
CTD-528 Low viscosity and room temperature cure

Best for vacuum infusion

25° C <1000 cP 3-4 hrs
Cyanate Ester

Cyanate Ester Insulation

Nanuq® Electrical InsulationCTD pioneered the development and application of cyanate ester insulations for use in advanced magnet systems. CTD’s 400-series products offer radiation resistance, as well as higher temperature operation and long pot life, to address the challenges of building and operating the very large magnets used in fusion energy, high-field accelerator, and medical device applications.

One of these insulations, CTD-435, has been selected for use in building the ITER Toroidal Field (TF) magnets. The ITER TF coils will be the largest superconducting magnets ever produced, and they will be constructed by ITER team members in Europe and Japan.

Resin System Description Process Temp Viscosity Working Time
CTD-403 Cyanate ester system
Highest radiation resistance
50° C 25 cP >80 hrs
CTD-415P Cyanate ester / bismaleimide blend
Hot-melt prepreg system
22° C N/A 3 wks
CTD-422 Cyanate ester / epoxy blend 50° C 50 cP >48 hrs
CTD-425 Cyanate ester / epoxy blend
ITER Qualified
45° C 90 cP >100 hrs
CTD-435 Cyanate ester / epoxy blend
ITER Qualified
60° C 60 cP >100 hrs

Ceramic/Polymer Hybrid Insulation

Nanuq® Electrical Insulation

Ceramic polymer hybrid image

CTD’s patented ceramic/polymer hybrid insulations enable the wind-and-react fabrication of Nb3Sn magnets. In this process, the inorganic portion of the insulation system is applied as the coil is wound. Next, the magnet is heat treated at elevated temperatures to simultaneously produce the Nb3Sn superconducting phase and the ceramic component of the hybrid insulation.  After the high-temperature reaction cycle, the entire assembly is impregnated with an epoxy or cyanate ester to complete the coil. These insulations reduce the risk associated with the manufacture of high-field Nb3Sn magnets by eliminating the need to manipulate the strain-sensitive conductor after it has been heat-treated, and provide the strength and stiffness needed to generate high fields for particle accelerators and related applications.

CTD-1202 Datasheet

HTS Wire

HTS Wire Insulation

Nanuq® Electrical Insulation

HTS cable

CTD-1357 is an insulating coating that is continuously applied to long lengths of HTS wire. The insulated wire is flexible and can be used in building cables, coils, or other devices, and can be handled with standard equipment used in these processes. In addition, the insulated wire retains its flexibility at low temperatures to allow cables to be moved while still cold.

CTD-1357 Datasheet


Polyimide Coating

Nanuq® Electrical Insulation
Polyimide Coatings

CTD-201 is a polyimide coating that provides a primary insulation layer on complex surfaces where the use of polyimide films (e.g., Kapton®) is difficult.  This product can be applied by spraying or brushing, and the resulting coating has similar properties to polyimide films. Additionally, as opposed to typical liquid polyimides which require temperatures as high as 300-400°C to cure, CTD-201 can be cured below 100°C.

CTD-201 Datasheet