different between insulation vs sleeving

English

insulate +? -ion

insulation (countable and uncountable, plural insulations)

The act of insulating; detachment from other objects; isolation.
The state of being insulated; detachment from other objects; isolation.
Any of a variety of materials designed to reduce the flow of heat, either from or into a building.
(engineering) The act of separating a body from others by nonconductors, so as to prevent the transfer of electricity, heat, or sound
(engineering) The state of a body so separated.
(electricity) a medium in which it is possible to maintain an electrical field with little supply of energy from additional sources.

sleeving

sleeving (plural sleevings)

(Britain) Hollow flexible tube used as insulation for wires and cables.
- 1996, A.L. Brown, Vehicle Security Systems: Build Your Own Alarm and Protection Systems, page 50
  Pull up the sleeving along the cable, including the copper wire, then using a cigarette lighter heat the sleeving to make it shrink.

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