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What is the name of the fabric sleeve insulator used for components (typically fuses) and solder joints found inside motor windings?

Can regular heat shrink tubing be used as a substitute?

enter image description here
Image by cwbenz. Retrieved from here.

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  • \$\begingroup\$ maybe fiberglass and resin \$\endgroup\$
    – jsotola
    Dec 12, 2018 at 7:52
  • \$\begingroup\$ Heatshrink may degrade at lower temperatures than that stuff. \$\endgroup\$
    – user16324
    Dec 12, 2018 at 8:26

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This is called sleeving. In this case it looks like uncoated NOMEX, but the specific brand might vary.
This is applied in electromotors and generators where this fiberglass-like sleeving is impregnated with insulating lacquer or resin during dip-sealing or vacuum impregnation.

This material is used because it can handle high temperatures and is not flammable. It also has a much higher kV/mm than regular heat shrink.

In fact, heat-shrink degrades rather quickly, and can becomes actually conductive, and is typically avoided when long term insulation is required. Hence why heat-shrink is more a low voltage repair material.

If you are not going to use lacquer or impregnation I suggest you look for coated fiberglass sleeve. This is coated with polyurethane or acrylic. A brand name of this could be Vidaflex.

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