Green Heat Shrink Tubing 2:1 Ratio | 0.6mm–80mm | Electrical Cable Sleeving

Measure the outer diameter of the cable or connector you need to cover, then select a tubing size that is typically 20–30% larger than that measurement before shrinking. For example, if your wire is 3mm in diameter, a 4mm (≈5/32") unshrunk tube generally provides a secure fit after shrinking. When in doubt, size up — you can always apply more heat to tighten the fit.

A 2:1 shrink ratio means the tubing will shrink to approximately half its original unshrunk diameter when heat is applied. For example, a 10mm (≈3/8") tube will shrink down to roughly 5mm (≈3/16"). This ratio is the most common for general-purpose electrical insulation and cable sleeving applications.

Standard 2:1 polyolefin heat shrink tubing typically begins to shrink at around 70°C (158°F) and fully recovers at approximately 120°C (248°F). A heat gun is generally recommended for even, controlled shrinkage. Move the heat source steadily along the tube to avoid scorching or uneven shrinkage.

Yes. Polyolefin heat shrink tubing is generally resistant to UV exposure, moisture, and common automotive fluids, making it suitable for outdoor wiring, engine bays, and marine environments in most cases. For extreme chemical exposure or waterproofing requirements, a dual-wall adhesive-lined variant may be more appropriate.

Yes. The available diameter range of 0.6mm–80mm (unshrunk) covers a wide spectrum from fine gauge signal wires (AWG 30 and smaller) up to large power cables and cable bundles. Refer to the variant selector to match the unshrunk diameter to your wire or connector size.

Standard polyolefin 2:1 heat shrink tubing is typically rated for up to 600V and provides solid electrical insulation for low- to medium-voltage applications. Contact us to confirm specific dielectric ratings for your use case before use in high-voltage environments.

Absolutely. The tubing can be cut to any length with standard scissors or a utility knife before applying heat. Lengths available range from 1m (≈3.3 ft) to 30m (≈98.4 ft) per order to suit both small repairs and larger wiring projects.

Green is commonly used in electrical wiring to identify ground or earth conductors in many international wiring standards, and is also used for signal lines in custom harnesses. Using color-coded heat shrink tubing makes future troubleshooting and maintenance significantly faster, especially in complex automotive or panel wiring setups.