Heat shrink tubing (or commonly "heat shrink") is a tube which shrinks in diameter when heated. It's diameter and thickness can vary, and there are three main categories, thin wall, medium wall and thick wall tube. Heat shrink is used to insulate wires, connections, joints and terminals in Electrical Engineering. It can also be used to repair wires, bundle wires together, and to protect wires or small parts from minor abrasion.

It is placed over the connection to be protected and then heated with an oven, hot air gun or similar tool. Convenient but less effective methods for shrinking the tube include a soldering iron (held in close proximity, but not touching the tube) or the heat from a lighter. These processes cause the tubing to contract as far as one sixth of its original diameter (dependent on the heat shrink), providing a snug fit over irregularly shaped joints. This provides good electrical insulation, protection from dust, solvents and other foreign materials, as well as strain relief. If overheated, heat shrink tubing can melt, scorch or catch fire like any other plastic.

Some types of heat shrink contain a layer of thermoplastic adhesive on the inside to help provide a good seal and better adhesion, while others rely on friction from the closely conforming materials. Heating plain non-adhesive shrink tube to very near the melting point may allow it to fuse to the underlying material as well.

Source: Wikipedia

Many different types and sizes are available from stock f.e. DERAY®-HB, DERAY®-H, DERAY®-I, DERAY®-IGY, DERAY®-I 3000, DERAY®-IAKT 3:1, DERAY®-IAKT 4:1, CFM, DERAY®-KY175 (KYNAR®/PVDF), DERAY®-VT220 (Viton®), Teflon® / PTFE .

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