3:1 Dual-Wall Adhesive Heat Shrink Tubing 1M | 1.6–30mm
3:1 Dual-Wall Adhesive Heat Shrink Tubing 1M | 1.6–30mm
3:1 Dual-Wall Adhesive Lined Heat Shrink Tubing – 1 Metre
Get professional-grade waterproof insulation and cable protection with this 3:1 dual-wall heat shrink tubing. The inner adhesive (glue-lined) layer bonds tightly to plastic, rubber, and metal surfaces, creating a moisture-resistant, airtight seal — perfect for electrical wiring, cable splices, connector protection, and marine or automotive applications.
Available in a wide range of diameters from 1.6 mm to 30 mm, this 1-metre length suits everything from fine wire to large cable bundles. Made in China from high-quality PE material and CE certified.
Key Features
- 3:1 Shrink Ratio – Ideal for irregular shapes, connectors, and tapered components; provides a snug, secure fit
- Dual-Wall Construction – Outer PE wall for mechanical protection; inner hot-melt adhesive layer for a waterproof, airtight seal
- Wide Diameter Range – Available from 1.6 mm up to 30 mm to cover thin wires and thick cable bundles alike
- CE Certified – Meets European conformity standards for safety and quality
- Adhesive Bonds to Multiple Surfaces – Sticks securely to plastic, rubber, and metal for a long-lasting, corrosion-resistant connection
- Wide Operating Temperature – Rated from -40 °C to +125 °C, suitable for harsh environments
- Medium Wall Thickness – Balances flexibility with enhanced mechanical protection strength
Technical Specifications
| Material | Polyethylene (PE) |
| Shrink Ratio | 3:1 |
| Diameter Range | 1.6 mm – 30 mm (inner diameter) |
| Length | 1 Metre per piece |
| Initial Contraction Temp | 70 °C |
| Full Shrinkage Temp | 125 °C |
| Inner Layer Melt Temp | 70 °C – 100 °C |
| Operating Temp Range | -40 °C to +125 °C |
| Colour | Black |
| Certification | CE |
| Country of Origin | Made in China |
Common Applications
- Electrical cable splices and wire harness protection
- Connector and terminal sealing
- Marine, automotive, and outdoor wiring
- Corrosion protection for metal joints and terminals
- Mechanical strain relief on cables and leads
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Frequently Asked Questions
Q: What does "3:1 shrink ratio" mean for dual-wall heat shrink tubing?
A: A 3:1 shrink ratio means the tubing will shrink down to one-third of its original inner diameter when heat is applied. For example, a 30 mm diameter tube will shrink to approximately 10 mm. This larger ratio makes the tubing ideal for irregular shapes, stepped connectors, and tapered cable ends where standard 2:1 tubing would not conform properly.
Q: How do I apply this adhesive-lined heat shrink tubing?
A: Slide the correct diameter of tubing over your cable or connection, then apply even heat using a heat gun, starting from the centre and working outward. At around 70 °C the tubing begins to contract; at 125 °C full shrinkage is achieved. The inner adhesive layer melts and flows to fill gaps, creating a waterproof, airtight seal. Avoid using an open flame as it can cause uneven shrinking or damage.
Q: Is the diameter listed the inner diameter before or after shrinking?
A: The listed diameter refers to the inner diameter before shrinking. Always choose a size slightly larger than the cable or connector you want to cover, so the tubing slides on easily before heat is applied.
Q: Can this dual-wall heat shrink tubing be used outdoors or in marine environments?
A: Yes. The inner adhesive lining creates a moisture-resistant, waterproof seal that is well suited for outdoor, marine, and automotive wiring. The wide operating temperature range of -40 °C to +125 °C also makes it reliable in both cold and high-temperature environments.