2:1 Heat Shrink Tubing — Electrical Wire Sleeving, Ø0.6mm to Ø80mm, Cut to Length

Measure the outer diameter of the wire, connector, or bundle you need to cover. Choose a tubing size that is slightly larger than that measurement before shrinking. With a 2:1 ratio, the tubing will shrink to approximately half its listed diameter — so Ø6mm tubing shrinks to roughly Ø3mm (≈1/8"). When in doubt, size up one step to ensure the tubing slides on easily before you apply heat.

A 2:1 ratio means the tubing shrinks to approximately half its original inner diameter when heat is applied. For example, Ø10mm (≈3/8") tubing will shrink down to roughly Ø5mm (≈3/16"). The wall thickness increases as the tubing contracts, which improves insulation and mechanical grip on the underlying component.

Standard polyolefin 2:1 heat shrink tubing typically begins to activate at around 90°C (194°F) and fully shrinks at approximately 120°C (248°F). A heat gun is the recommended tool — it provides even, controlled heat. A lighter or match can work for small diameters in a pinch, but may cause uneven shrinkage or surface scorching if held too close.

Yes. Polyolefin heat shrink tubing generally provides good resistance to UV exposure, moisture, oil, gasoline, and mild solvents — making it suitable for automotive wiring harnesses, marine electrical connections, RV wiring, and outdoor garden lighting. For prolonged submersion or bilge-area use, an adhesive-lined (3:1 or 4:1) variant is typically recommended for a fully watertight seal.

Polyolefin 2:1 heat shrink tubing typically carries a voltage rating of up to 600V, which covers the vast majority of automotive (12V–48V), marine, and standard household low-voltage wiring applications. For high-voltage or industrial applications, please contact us to confirm the specific rating for the diameter you require.

The tubing cuts cleanly with scissors, a utility knife, or wire cutters before or after shrinking. Cutting before shrinking gives the most precise fit. The cut ends do not fray or unravel. For very small diameters (Ø0.6mm–Ø2mm), sharp scissors or a razor blade will give the cleanest cut.

This listing is for standard non-adhesive 2:1 polyolefin tubing. It provides electrical insulation and mechanical protection but does not create a fully waterproof seal on its own. For waterproof connections — such as outdoor splice joints or marine terminals — an adhesive-lined heat shrink tubing (typically 3:1 or 4:1 ratio) is generally the better choice.