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Heat shrink tubing (or commonly "heat shrink") is a tube which shrinks in diameter when heated. Its diameter and thickness can vary, and there are three main categories: thin-wall, medium-wall, and thick-wall tube. It is rated by its expansion ratio, a comparative of the differences in expansion and recovery rate. Heat shrink is used to insulate wires offering abrasion resistance and environmental protection for conductors, connections, joints, and terminals.
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