Select a diameter that is slightly larger than the widest part of the object you need to cover before shrinking. For example, if your wire bundle measures 2mm across, choose the 2.5mm or 3mm tubing. After heat is applied, the tubing typically shrinks to roughly half its original diameter (2:1 ratio), so the recovered size should be smaller than your component. When in doubt, size up — you can always apply more heat, but you cannot reverse over-shrinking.

This heat shrink tubing generally uses a 2:1 shrink ratio, meaning it shrinks to approximately half its expanded diameter when heat is applied. For example, the 4mm tubing will typically recover to around 2mm. Exact recovered diameter may vary slightly by color and batch — contact us to confirm if tight tolerances are required.

This tubing is generally suitable for light outdoor use where it will not be continuously submerged or exposed to prolonged UV radiation. For harsh outdoor environments — such as marine wiring, underground burial, or direct sunlight exposure — we recommend a dual-wall adhesive-lined heat shrink tubing for added moisture and UV resistance. Contact us to confirm suitability for your specific application.

This tubing typically begins to shrink at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A standard heat gun set to low or medium is the recommended tool. A lighter or match can work in a pinch but may cause uneven shrinkage or scorching — use with caution.

Yes. The diameter range of 1mm–10mm covers most common wire gauges used in automotive, electronics, and home wiring projects. As a general guide: 1–2mm suits thin signal wires (AWG 26–20), 3–5mm suits medium wires (AWG 18–14), and 6–10mm suits heavier cables or small wire bundles. Always measure your wire or connector before selecting a size.

Each roll contains either 100m (≈328 ft) or 200m (≈656 ft) of tubing depending on the variant selected. The tubing can be cut to any length with standard scissors or a utility knife before or after shrinking. Buying by the roll is significantly more economical than pre-cut pieces for ongoing projects.

In most cases, color is purely cosmetic and does not affect the electrical insulation or shrink performance of the tubing. All color variants in this listing are made from the same base polyolefin material. Color-coding is commonly used in wiring harnesses to identify circuits — for example, red for positive, black for negative, and green or yellow for ground in some standards.