Add a layer of insulation to prevent electricity and heat from dissipating from wire and cable. This sleeving is often used in motors, transformers, and generators. Made of coated fiberglass, it resists abrasion, acids, alkalies, and chemicals.

Vinyl-coated sleeving resists wax and alcohol. Sleeving is flame-rated VW-1 to meet requirements for preventing the spread of flames based on a timed test with vertically suspended material.