3:1 Green Adhesive Heat Shrink Tubing — Waterproof Glue Lined Sleeving

Measure the outer diameter of the wire or connector before shrinking. With a 3:1 shrink ratio, the tubing should slide over the component easily before heat is applied. As a general rule, choose a pre-shrink diameter that is 20–30% larger than the component's outer diameter. For example, for a 3mm wire, φ4mm tubing is typically a good starting point. Sizes range from φ1.6mm (≈1/16") up to φ39mm (≈1-1/2") — select your size from the variant options above.

This tubing generally begins to shrink at around 70–90°C (158–194°F) and fully activates the inner adhesive at approximately 120°C (248°F). A heat gun is the recommended tool. Open flame can be used with caution but may cause uneven shrinkage or scorching.

Yes. The inner adhesive layer melts and flows around the substrate when heated, creating a watertight seal well-suited for outdoor, marine, and underground wiring applications. It typically provides resistance to moisture, mild chemicals, and UV exposure. For submersion or extreme environments, confirm suitability with your specific application requirements.

A 3:1 shrink ratio means the tubing will shrink to approximately one-third of its original inner diameter when heat is applied. For example, φ9.5mm (≈3/8") tubing will shrink down to roughly φ3.2mm (≈1/8"). This wider ratio makes it suitable for covering connectors, splices, and irregular shapes that standard 2:1 tubing cannot accommodate — particularly useful for waterproof butt connectors and ring terminals.

This tubing is not thread-specific — it is designed to fit over wires, cables, connectors, and terminals of varying shapes. It is generally compatible with standard automotive connectors, marine terminals, butt splices, and ring terminals. Check the diameter range (φ1.6mm–φ39mm) against your connector's outer dimension to confirm fit. It is not recommended for use over silicone-jacketed wire without surface preparation, as adhesion may be reduced.

For single repairs or small wiring jobs, a 1m roll is typically sufficient. For automotive wiring harnesses or larger installations, 3m, 5m, or 10m rolls offer better value per meter. For ongoing shop use or bulk projects, the 15m roll provides the most cost-effective coverage. Note that 15m rolls are available in smaller diameters (φ1.6mm–φ4.8mm); larger diameters are available in shorter lengths.

Yes. The tubing can be cut to any length with standard scissors or a utility knife before application. Cut ends are clean and do not fray. For best results, cut at a slight angle to make it easier to slide over connectors and terminals.

Wall thickness after shrinking varies by diameter. In general, the recovered wall thickness is typically in the range of 0.8mm–2.0mm depending on the variant selected. Contact us to confirm the exact specification for your chosen size if precise wall thickness is critical to your application.