3:1 Heat Shrink Tubing with Adhesive Glue Lining — Φ1.6mm to Φ30mm

Measure the outer diameter of the bundle or connector you need to cover, then select a size whose recovered (post-shrink) diameter is slightly smaller than your cable OD. For example, Φ6.4mm (1/4") tubing recovers to approximately 2.1mm, making it suitable for wire bundles up to about 6mm. When in doubt, size up — you can always apply more heat to achieve a tighter fit. A quick reference: 1/16" ≈ 1.6mm, 1/8" ≈ 3.2mm, 1/4" ≈ 6.4mm, 1/2" ≈ 12.7mm, 1" ≈ 25.4mm.

A 3:1 ratio means the tubing shrinks to one-third of its original supplied diameter when heat is applied. This wider range of coverage makes it suitable for irregular shapes, connectors, and stepped transitions where a standard 2:1 tube would not conform tightly enough. For example, Φ9.5mm (3/8") tubing typically recovers to approximately 3.2mm (1/8").

The inner hot-melt adhesive layer typically flows and bonds at temperatures around 70–90°C, then cures as it cools to form a firm, waterproof seal. The resulting bond generally provides strong pull-out resistance and strain relief. Exact bond strength values depend on the substrate material and surface preparation — clean, dry surfaces yield the best results.

Yes. The glue-lined construction creates a moisture-resistant seal around the cable entry point, making it generally suitable for outdoor, automotive, and marine environments. The adhesive liner prevents water wicking along the wire strands — a common cause of corrosion in exposed wiring. For prolonged submersion or harsh chemical exposure, contact us to confirm suitability for your specific application.

A heat gun set to 90–120°C (194–248°F) is the recommended tool. Move the gun evenly along the tubing from one end to the other to avoid hot spots and ensure the adhesive flows uniformly. In a pinch, a lighter can work for small diameters (Φ1.6mm–Φ3.2mm), but a heat gun gives more consistent results and reduces the risk of scorching the outer wall.

Yes. Dual-wall adhesive heat shrink tubing is widely used in automotive wiring repairs, trailer harness splices, and battery terminal protection. The adhesive liner seals out road moisture and vibration — a common cause of corrosion in vehicle wiring. The color options also make it easy to maintain color-coded wiring conventions during repairs.

For occasional repairs or a single project, 1m (≈3.3 ft) is typically sufficient. For workshop stock or recurring electrical work, 5m (≈16.4 ft) or 10m (≈32.8 ft) rolls offer better value per meter. The 10m option is generally the most cost-effective for professional or high-volume use. You can mix and match sizes and colors across separate orders to build a complete stock.