2:1 Heat Shrink Tubing – Dual-Wall Polyolefin, φ14mm to φ25mm, 7 Colors

Select a tubing diameter that is 20–30% larger than the outer diameter of the object you want to cover. For example, if your cable measures 10mm in diameter, choose the φ14mm (unshrunk) size. After shrinking at the recommended temperature, the tubing will conform tightly around the cable. When in doubt, size up — you can always apply more heat, but you cannot reverse over-shrinkage.

This tubing has a 2:1 shrink ratio, meaning it will shrink to approximately half its original unshrunk diameter when heat is applied. For example, φ14mm (unshrunk) will shrink to approximately φ7mm, and φ25mm (unshrunk) will shrink to approximately φ12.5mm. This ratio is suitable for most standard cable insulation and connector sealing tasks.

Polyolefin heat shrink tubing generally begins to shrink at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A heat gun is the recommended tool — move it steadily along the tubing to ensure even shrinkage. Avoid open flames, which can cause uneven shrinkage, scorching, or damage to the underlying wire insulation.

Yes. Polyolefin heat shrink tubing is generally flame-retardant and self-extinguishing. It is also typically UV-resistant and moisture-resistant, making it suitable for outdoor wiring, automotive applications, and marine environments. Confirm the specific rating on the product label before use in safety-critical or high-temperature applications.

Compatibility depends on the cable's outer diameter (OD), not the wire gauge alone. As a general guide:

• φ14mm (unshrunk) — fits cables typically up to ~11mm OD
• φ15mm — fits cables typically up to ~12mm OD
• φ16mm — fits cables typically up to ~13mm OD
• φ18mm — fits cables typically up to ~15mm OD
• φ20mm — fits cables typically up to ~17mm OD
• φ22mm — fits cables typically up to ~19mm OD
• φ25mm — fits cables typically up to ~21mm OD

Always measure your cable with calipers before ordering to ensure a proper fit.

Yes. Polyolefin heat shrink tubing is widely used in automotive wiring harness repair, connector insulation, and wire bundling. It is generally resistant to oils, fuels, and common automotive chemicals. For high-heat engine bay applications, verify the tubing's rated temperature range before installation to ensure it meets your specific requirements.

Use sharp scissors or a utility knife for clean, straight cuts. Cut the tubing slightly longer than the area you need to cover — typically 5–10mm (≈¼") of overlap on each end is recommended to ensure a complete seal after shrinkage. Avoid crushing the tubing while cutting to maintain a round cross-section, which makes sliding it over the cable easier.