Heat Shrink Tubing 2:1 – Φ0.6mm to Φ5mm, 7 Colors, 1M/5M/10M Rolls

Measure the outer diameter of the wire or connector you need to cover. Choose a tubing size whose recovered (shrunk) diameter is slightly smaller than your wire's OD, and whose expanded diameter is larger. As a general rule, select a size where the expanded ID is at least 20% larger than the object. For example, a Φ2mm tube typically recovers to about Φ1mm, so it suits wires around 0.8–1.5mm OD. When in doubt, size up — you can always apply more heat to shrink tighter.

A 2:1 shrink ratio means the tubing will shrink to approximately half its original expanded diameter when heat is applied. For example, a Φ4mm tube will recover to roughly Φ2mm. This ratio is the most common for general-purpose electrical insulation and wire bundling.

Standard 2:1 polyolefin heat shrink tubing generally activates at around 90°C (194°F) and fully recovers at approximately 120°C (248°F). A heat gun is the recommended tool. A lighter or match can work in a pinch but may cause uneven shrinkage or scorching — use with caution.

Standard polyolefin 2:1 tubing generally provides good resistance to moisture, UV, and mild chemicals, making it suitable for most indoor and light outdoor applications. For harsh marine environments or prolonged UV exposure, an adhesive-lined (3:1) tubing is typically recommended for a waterproof seal. Contact us to confirm suitability for your specific application.

As a general guide: Φ0.6–0.8mm suits very fine wires (typically 30–28 AWG); Φ1–1.5mm suits 26–22 AWG; Φ2–2.5mm suits 20–18 AWG; Φ3–3.5mm suits 16–14 AWG; Φ4–5mm suits 12–10 AWG or small connectors. These are approximate ranges — always measure your wire's outer diameter before ordering.

Yes, 2:1 polyolefin heat shrink tubing is widely used for automotive wiring repairs, connector insulation, and wire bundling. It generally withstands the temperature ranges found in engine bays and interior wiring. For high-heat zones near exhaust components, a higher-temperature rated tubing may be more appropriate.

For small repairs or a few connections, the 1M (≈3.3 ft) roll is typically sufficient. The 5M (≈16.4 ft) roll suits medium projects like wiring a car stereo or organizing a workbench. The 10M (≈32.8 ft) roll is ideal for larger installations, professional use, or when you want a supply on hand. Buying longer rolls generally offers a lower cost per meter.