3:1 Dual-Wall Heat Shrink Tube with Glue – 8 Sizes | 1m
3:1 Dual-Wall Heat Shrink Tube with Glue – 8 Sizes | 1m
Transparent 3:1 Dual-Wall Heat Shrink Tubing with Adhesive Glue Lining – 1 Metre
Protect, seal, and insulate your wires, cables, and connectors with this premium transparent dual-wall heat shrink tube. Featuring a 3:1 shrink ratio and a built-in hot-melt adhesive inner layer, this tubing creates a watertight, strain-relieved seal that bonds firmly to plastic, rubber, and metal surfaces. Available in eight diameters — 1.6, 2.4, 3.2, 4.8, 6.4, 7.9, 9.5, and 12.7 mm — making it ideal for a wide range of electrical, automotive, and DIY applications.
Made in Mainland China.
Key Features
- 3:1 Shrink Ratio — Accommodates irregular shapes and provides a tight, professional finish on oversized or stepped connectors.
- Dual-Wall Construction — Outer PE shell maintains flexibility while delivering enhanced mechanical protection; inner adhesive layer melts and flows to create a moisture-resistant seal.
- Wide Diameter Range — 1.6 / 2.4 / 3.2 / 4.8 / 6.4 / 7.9 / 9.5 / 12.7 mm inner diameter options to fit virtually any cable or connector.
- Adhesive Inner Layer — Bonds securely to plastic, rubber, and metal for a reliable, long-lasting seal.
- Broad Working Temperature — Rated from -40 °C to +125 °C for use in demanding environments.
- Transparent Finish — Allows easy visual identification of wires and connector labels underneath the tubing.
- 1 Metre per Length — Easy to cut to your exact required length with no waste.
Technical Specifications
| Material | Polyethylene (PE) — Dual Wall |
| Shrink Ratio | 3:1 |
| Colour | Transparent / Clear |
| Available Diameters (Inner) | 1.6 / 2.4 / 3.2 / 4.8 / 6.4 / 7.9 / 9.5 / 12.7 mm |
| Length per Unit | 1 Metre |
| Initial Shrink Temperature | 70 °C |
| Full Shrink Temperature | 125 °C |
| Inner Adhesive Melt Temperature | 70 °C – 100 °C |
| Operating Temperature Range | -40 °C to +125 °C |
| Origin | Mainland China |
Common Applications
- Wire and cable insulation & bundling
- Automotive wiring harness repairs
- Marine and outdoor electrical connections
- Connector and solder joint sealing
- DIY electronics and hobby projects
- Strain-relief on cable ends
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Frequently Asked Questions
Q: What does the "3:1 shrink ratio" mean for this heat shrink tube?
A: A 3:1 shrink ratio means the tube will shrink to one-third of its original listed inner diameter when heat is applied. For example, a 9.5 mm tube will shrink down to approximately 3.2 mm, providing a very snug, secure fit over cables, connectors, and irregular-shaped objects — far more versatile than standard 2:1 tubing.
Q: What is the adhesive glue layer inside the tube for?
A: The inner hot-melt adhesive layer flows when heat is applied (between 70 °C and 100 °C), filling gaps and bonding to the surface of cables, connectors, metals, and plastics beneath. This creates a watertight, airtight seal that prevents moisture ingress and adds extra strain relief — making it especially useful for outdoor, marine, and automotive wiring applications.
Q: Can I use a standard heat gun to shrink this tubing?
A: Yes. A standard heat gun set to the appropriate temperature range (70 °C to start shrinking, up to 125 °C for full shrink) works perfectly. Avoid open flames, as they can scorch or damage the transparent outer wall. Move the heat gun evenly along the tube for a uniform, professional finish.
Q: How do I choose the right diameter for my cable?
A: Choose a diameter that is slightly larger than the widest point of the object you want to cover (e.g., the cable or connector). Because this is a 3:1 tube, it has generous coverage — for example, a 4.8 mm tube can cover items down to about 1.6 mm after full shrinkage. When in doubt, size up slightly to ensure the tube slides on easily before applying heat.