Heat Shrink Tubing 2:1 Ratio — Φ0.6mm to Φ1.5mm, 7 Colors, Polyolefin Wire Sleeving

Measure the outer diameter of the wire or connector you need to cover. Choose a heat shrink tube whose expanded (pre-shrink) inner diameter is slightly larger than your wire. With a 2:1 shrink ratio, the tube will shrink to approximately half its original diameter — for example, φ1mm tubing will shrink to roughly φ0.5mm. When in doubt, size up one step to ensure the tubing slides on easily before shrinking.

This tubing has a 2:1 shrink ratio, meaning it shrinks to approximately half its original inner diameter when heat is applied. This ratio is generally suitable for most standard wire insulation, cable bundling, and connector protection tasks. If you need a tighter grip or waterproofing, a 3:1 adhesive-lined tube would typically be a better fit.

Polyolefin heat shrink tubing typically begins to activate at around 90°C (194°F) and fully shrinks at approximately 120°C (248°F). A heat gun set to low or medium is recommended for even, controlled shrinkage. Move the heat gun slowly along the length of the tube to avoid hot spots. A lighter can work for short pieces but may cause uneven shrinkage or surface scorching.

Standard polyolefin heat shrink tubing generally provides basic moisture resistance and is suitable for light outdoor or damp-environment use. However, it is not waterproof — it does not have an adhesive inner lining to seal out water. For fully waterproof applications such as marine wiring or underground splices, adhesive-lined (3:1 ratio) heat shrink tubing is typically recommended.

Polyolefin heat shrink tubing typically operates in a range of approximately -55°C to +125°C (-67°F to +257°F). This makes it suitable for most automotive, consumer electronics, and household wiring applications. If your application involves sustained exposure to temperatures above 125°C, contact us to confirm suitability or consider a higher-temperature material such as PTFE tubing.

Yes, polyolefin heat shrink tubing is generally compatible with automotive wiring harnesses, terminal connectors, and wire splices. It is commonly used for insulating soldered joints, protecting exposed conductors, and bundling wire runs in vehicles. Always verify that the wire gauge and connector outer diameter match your selected tubing diameter before applying.

Yes. With 7 available sheath colors — Black, White, Red, Green, Yellow, Blue, and Clear — this tubing is well-suited for color-coding wiring systems in electronics, automotive, and DIY projects. Color-coding helps with faster identification during troubleshooting and reduces wiring errors in multi-conductor assemblies. The Clear option is useful when you want to protect a wire while keeping any existing markings or labels visible.

For single repairs or prototyping, the 1 m or 2 m options are generally sufficient. For ongoing production work, wiring harness assembly, or stocking a workshop, the 5 m, 10 m, or 40 m rolls offer better value per meter. Cut the tubing slightly longer than the area you need to cover — typically 5–10mm of overlap on each side of a splice is a common practice.