Dual Wall Adhesive Heat Shrink Tubing 4:1 – 4 to 20mm Sizes

Dual Wall Adhesive Heat Shrink Tubing – Professional Cable Protection

Keep your wiring neat, waterproof, and protected with this Dual Wall Heat Shrink Tubing with Adhesive Glue Lining. Available in sizes 4, 6, 8, 12, 16, and 20mm, this PE-based tubing delivers a powerful 4:1 shrink ratio — meaning it shrinks down to just one-quarter of its original diameter for a firm, secure, and moisture-resistant seal around cables, wires, and connectors.

The inner adhesive (hot-melt glue) layer melts and flows as the tube shrinks, filling gaps and bonding tightly to the underlying surface. The result is a robust, waterproof sleeve that protects connections from moisture, dust, abrasion, vibration, and corrosion.

Made in Mainland China.

Key Features

• 4:1 Shrink Ratio: Superior coverage and tight fit around irregular shapes and connectors.
• Dual Wall Construction: Tough outer PE shell with an inner hot-melt adhesive layer for a waterproof, strain-relieved seal.
• Multiple Sizes: Available in 4mm, 6mm, 8mm, 12mm, 16mm, and 20mm diameters to cover a wide range of wire and cable gauges.
• Electrical Insulation: Provides reliable dielectric insulation, protecting against shorts and electrical faults.
• Corrosion & Moisture Resistant: The adhesive lining creates a watertight barrier ideal for marine, automotive, and outdoor applications.
• Abrasion & Chemical Resistance: Durable PE outer wall stands up to mechanical wear and common chemicals.
• Easy to Apply: Simply slide over the wire or connector and apply heat with a heat gun — no special tools required.

Specifications

• Material: Polyethylene (PE) – Dual Wall with Hot-Melt Adhesive Inner Layer
• Shrink Ratio: 4:1
• Available Sizes: 4mm / 6mm / 8mm / 12mm / 16mm / 20mm
• Type: Heat Shrinkable Tubing
• Application: Cable protection, wire splicing, connector sealing, strain relief
• Origin: Mainland China

Common Applications

• Marine & automotive wiring harnesses
• Outdoor electrical cable joints and splices
• Battery terminal protection
• Cable strain relief on tools and appliances
• DIY electronics, home wiring repairs, and hobby projects

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For guidance on safe electrical insulation practices, refer to the OSHA Electrical Safety Resource and CPSC Electrical Safety Guidelines.

Frequently Asked Questions

Q: What is the shrink ratio of this dual wall heat shrink tubing?

A: This tubing features a 4:1 shrink ratio, meaning it will shrink to one-quarter of its original supplied diameter when heat is applied. This makes it ideal for covering connectors, terminals, and irregular cable shapes that a standard 2:1 tube cannot accommodate.

Q: How do I apply dual wall adhesive heat shrink tubing?

A: Slide the appropriately sized tube over your cable, wire, or connector before making the connection. Once in position, apply even heat using a heat gun (or similar heat source) along the length of the tube. The outer PE layer will shrink while the inner adhesive layer melts and flows to create a waterproof, bonded seal. Allow to cool before handling.

Q: Is this heat shrink tubing suitable for outdoor and marine use?

A: Yes. The dual wall design — with its hot-melt adhesive inner lining — creates a watertight, corrosion-resistant seal that is well-suited for outdoor, marine, and automotive environments where exposure to moisture and vibration is a concern.

Q: Which size should I choose for my cable?

A: Choose a size whose supplied (pre-shrink) inner diameter is slightly larger than the outer diameter of your cable or connector. After shrinking at a 4:1 ratio, the tubing will grip firmly. Available sizes are 4mm, 6mm, 8mm, 12mm, 16mm, and 20mm to cover most common wire and cable gauges.