Edexcel GCSE Design and Technology · 1DT0
Specification 5.8.1 · Paper 1
Revise: Surface Finishes and TreatmentsHeat-shrink tubing is a polymer sleeve that contracts when heated, fitting closely around a wire, joint or component. It provides electrical insulation and protection against abrasion. It can also reinforce a connection against cable strain, and different colours help identify wires.