Black 2:1 Heat Shrink Tubing – Polyolefin Cable Sleeving, Dia 0.6mm to 120mm

Measure the outer diameter of the wire or connector you need to cover. With a 2:1 shrink ratio, the tubing will shrink to approximately half its listed diameter when heated. For example, a Φ6mm tube will shrink to roughly 3mm (≈1/8"). Choose a size where the recovered (shrunken) diameter is slightly smaller than your cable's OD for a snug fit. When in doubt, size up — you can always apply more heat, but you cannot expand tubing that has already shrunk.

Polyolefin 2:1 heat shrink tubing generally activates at temperatures around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A heat gun set to low-to-medium is typically sufficient. Avoid open flames, which can scorch or unevenly shrink the tubing.

As a general rule, cut the tubing 10–20% longer than the area you need to cover, since the tubing will also shorten slightly in length (typically 5–10%) as it shrinks radially. For example, to cover a 50mm (≈2") splice, cut approximately 55–60mm (≈2.2–2.4") of tubing.

Polyolefin heat shrink tubing is generally flame-retardant and meets common electrical insulation standards. It is widely used for wire insulation, connector protection, and cable bundling in automotive, marine, and electronics applications. For safety-critical or high-voltage installations, verify the specific voltage rating of the variant you select.

Standard 2:1 polyolefin heat shrink tubing provides good moisture resistance once shrunk, making it suitable for many outdoor and damp-environment applications. However, it is not a waterproof seal — for fully waterproof connections, consider adhesive-lined (3:1 or 4:1) heat shrink tubing instead. Contact us to confirm suitability for your specific environment.

Polyolefin heat shrink tubing typically operates in a continuous temperature range of approximately -55°C to +125°C (-67°F to +257°F), making it suitable for most automotive, industrial, and household electrical applications.

For one-off repairs or small projects, the 1 Meter option is ideal. For workshop stock or recurring use, the 5–20 Meter options offer better value. Larger rolls (50–100 Meter) are suited for production runs, bulk wiring jobs, or resale. Buying longer lengths generally reduces the per-meter cost significantly.

Yes, polyolefin heat shrink tubing is commonly used in automotive wiring harness repair and fabrication. It is resistant to fuels, oils, and common automotive fluids in most cases. For high-heat engine-bay applications, verify the specific temperature rating of your chosen size.