2:1 Clear Heat Shrink Tubing — Φ0.6mm to Φ50mm, 1M & 5M Lengths

Measure the outer diameter of the wire or connector you need to cover, then choose a heat shrink tube with a pre-shrink inner diameter that is generally 20–30% larger than that measurement. With a 2:1 shrink ratio, the tubing will shrink to approximately half its listed diameter. For example, Φ6mm (≈1/4") tubing will shrink down to roughly 3mm (≈1/8") after full heat recovery.

This tubing uses a 2:1 shrink ratio, meaning it will shrink to approximately half its original inner diameter when heat is applied. This is the most common ratio for general-purpose wire insulation, connector protection, and cable bundling tasks.

Typically, 2:1 polyolefin heat shrink tubing begins to shrink at around 70°C (158°F) and fully recovers at approximately 120°C (248°F). A heat gun set to low or medium is generally sufficient. Avoid open flames, which can cause uneven shrinkage or scorching of the transparent sleeve.

This tubing is generally suitable for short-term outdoor use and provides basic moisture resistance once shrunk. For long-term outdoor, marine, or UV-exposed applications, an adhesive-lined or UV-stabilized heat shrink variant is typically recommended for a more durable seal.

Yes, clear polyolefin heat shrink tubing is commonly used in automotive wiring harness repairs, connector insulation, and terminal protection. It is generally rated for continuous use up to 125°C (257°F), which is suitable for most under-hood and cabin wiring environments. For high-heat zones near exhaust components, verify the specific temperature rating before use.

For a single wire repair or a small number of connections, the 1 Meter (≈39.4") option is typically sufficient. If you are working on a larger wiring harness, multiple solder joints, or want to keep a supply on hand for future projects, the 5 Meter (≈196.9") option offers better value per meter and reduces the need to reorder frequently.

Polyolefin heat shrink tubing is generally resistant to cracking under normal operating conditions. It maintains flexibility after shrinking and is resistant to many common chemicals, oils, and solvents encountered in DIY and light industrial settings. In extremely cold environments, flexibility may be reduced — contact us to confirm suitability for sub-zero applications.

In most cases, an open flame is not recommended because it can scorch or melt the transparent tubing unevenly, leaving discolored or weakened spots. A heat gun, hot-air rework station, or even a hair dryer on its highest setting generally provides more controlled, even heat distribution for a cleaner result.