5mm 2:1 Waterproof Heat Shrink Tubing for Wire & Cable Insulation

Measure the total length of wire or splice you need to cover, then add at least 10–15mm (about 1/2") of overlap on each end. For a single wire splice, 1 Meter is generally more than enough. For wiring harnesses or larger projects, the 5 Meter or 10 Meter rolls offer better value per foot.

A 2:1 shrink ratio means the tubing shrinks to approximately half its original diameter when heat is applied. This 5mm tubing will shrink down to typically around 2.5mm, conforming tightly around the wire or connector for a secure, insulated finish.

Yes. This tubing features a dual-wall construction with an inner adhesive lining that melts and flows when heated, creating a moisture-resistant seal around the wire. It is generally suitable for outdoor, marine, and automotive applications where moisture exposure is a concern.

5mm inner diameter tubing is typically compatible with wire gauges in the range of AWG 10–16 (single conductors) or small bundles of thinner wires. Always verify the outer diameter of your wire or connector before selecting a size to ensure a snug fit after shrinking.

This tubing generally activates at around 70°C (158°F) and fully shrinks at approximately 120°C (248°F). A heat gun is recommended for even, controlled shrinking. A lighter can work in a pinch but may cause uneven results or scorching on the outer jacket.

Yes. The waterproof adhesive-lined construction makes this tubing well-suited for automotive wiring repairs, boat wiring, trailer harnesses, and other environments where vibration and moisture are common. The sealed ends help prevent corrosion at wire connections over time.

Color choice is typically functional. In electrical wiring, red is commonly used for positive leads, black for negative/ground, green for earth/ground in some standards, and white or clear for neutral or signal wires. Yellow is often used for caution or specific circuit identification. Clear allows you to see the wire beneath the sleeve.