Dual Wall Adhesive Heat Shrink Tubing 4–20mm | 4:1 Ratio

Dual Wall Adhesive-Lined Heat Shrink Tubing – Reliable Electrical Insulation

Keep your wiring projects protected and professional with this dual wall heat shrink tubing with adhesive glue lining. Available in six diameters — 4mm, 6mm, 8mm, 12mm, 16mm, and 20mm — this versatile PE tubing delivers a watertight, secure seal around wires, cables, connectors, and splices. The 4:1 shrink ratio provides a tight, conforming fit even over irregular shapes, making it ideal for automotive wiring, marine applications, home electrical work, and hobbyist electronics.

Why Choose Adhesive-Lined Dual Wall Heat Shrink?

• Dual Wall Construction: Outer PE layer shrinks tightly while the inner adhesive layer melts and bonds to the substrate, forming a moisture-resistant seal.
• 4:1 Shrink Ratio: Accommodates a wide range of wire and cable diameters with a single tube size.
• 6 Diameter Options: 4mm, 6mm, 8mm, 12mm, 16mm, and 20mm — choose the right size for every application.
• Polyethylene (PE) Material: Excellent electrical insulation, chemical resistance, and durability under temperature and mechanical stress.
• Waterproof & Corrosion-Resistant: The hot-melt adhesive inner wall creates a sealed barrier against moisture, dust, and corrosion.
• Wide Application Range: Suitable for automotive, marine, solar, home electrical, industrial wiring, and DIY electronics projects.
• Easy to Apply: Simply slide over the cable and apply heat with a heat gun or lighter — shrinks quickly and uniformly.

Product Specifications

• Material: Polyethylene (PE) – Dual Wall with Hot-Melt Adhesive
• Shrink Ratio: 4:1
• Available Diameters: 4mm, 6mm, 8mm, 12mm, 16mm, 20mm
• Type: Heat Shrinkable Tubing
• Made in: Mainland China

Applications

• Automotive and motorcycle wiring harnesses
• Marine and outdoor cable protection
• Solar panel and battery cable connections
• Home electrical splices and connector insulation
• DIY electronics and hobbyist projects
• Industrial control panel wiring

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For guidance on safe electrical wiring practices and standards, visit the U.S. Consumer Product Safety Commission – Electrical Safety.

Learn more: Insulator (electricity)

Frequently Asked Questions

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

A: This heat shrink tubing features a 4:1 shrink ratio, meaning it can shrink down to one-quarter of its original diameter. This makes it suitable for a wide variety of wire and cable sizes across all six available diameter options (4mm to 20mm).

Q: Do I need a heat gun to apply this heat shrink tubing?

A: A heat gun is the recommended tool for even, controlled shrinking and to properly activate the inner adhesive glue lining. A lighter or other heat source can work in a pinch, but a heat gun ensures the best waterproof seal and most uniform result.

Q: Is this tubing waterproof after application?

A: Yes. The dual wall design includes a hot-melt adhesive inner layer that melts when heat is applied, flowing around the cable and creating a moisture-resistant, waterproof seal. This makes it ideal for outdoor, marine, and automotive applications where cables may be exposed to water or humidity.

Q: Which size should I choose for my cable?

A: Choose a diameter that is slightly larger than your cable's outer diameter before shrinking. With a 4:1 ratio, you have flexibility — for example, a 12mm tube will shrink down to approximately 3mm. When in doubt, size up to ensure easy fitting before heat is applied.