Dual Wall Adhesive Heat Shrink Tube 4–20mm | Cable Protection

Dual Wall Adhesive-Lined Heat Shrink Tubing – Sizes 4/6/8/12/16/20mm

Protect your wires, cables, and electrical connections with professional-grade dual wall heat shrink tubing. Featuring an inner adhesive glue lining that melts and flows when heat is applied, this tubing creates a watertight, airtight seal around cables — delivering superior insulation, strain relief, and long-lasting protection against moisture, corrosion, and mechanical wear.

With a 4:1 shrink ratio, this polyethylene (PE) heat shrink tube accommodates a wide range of wire diameters across six sizes (4mm, 6mm, 8mm, 12mm, 16mm, and 20mm), making it ideal for automotive wiring, marine applications, outdoor electrical work, and DIY electronics projects.

Key Features

• Dual Wall Construction: Outer PE layer for structural integrity; inner hot-melt adhesive for a sealed, waterproof bond
• 4:1 Shrink Ratio: Fits a wide range of wire and cable diameters with a secure, snug finish
• Six Size Options: 4mm, 6mm, 8mm, 12mm, 16mm, and 20mm to suit virtually any cable
• Electrical Insulation: Provides reliable electrical insulation to protect against short circuits
• Moisture & Corrosion Resistant: Adhesive lining seals out water, oils, and environmental contaminants
• Strain Relief: Reduces mechanical stress at connection points and wire terminals
• Easy Application: Simply cut to length, slide over the cable, and apply heat with a heat gun
• Material: Durable Polyethylene (PE)

Ideal Applications

• Automotive & marine wiring harnesses
• Outdoor and underground cable splices
• Electrical panel and junction box wiring
• DIY electronics repairs and modifications
• Connector and terminal waterproofing

Specifications

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For more information on electrical wiring safety standards and best practices, visit the OSHA Electrical Safety Guidelines.

Frequently Asked Questions

Q: What is dual wall heat shrink tubing and how does it differ from single wall tubing?

A: Dual wall heat shrink tubing has two layers — a tough outer PE layer and an inner hot-melt adhesive layer. When heat is applied, the outer layer shrinks while the inner adhesive melts and flows around the cable, creating a waterproof, airtight seal. Single wall tubing only shrinks without the adhesive bond, making dual wall tubing far superior for outdoor, marine, and moisture-exposed applications.

Q: What shrink ratio does this heat shrink tubing have?

A: This dual wall heat shrink tube features a 4:1 shrink ratio, meaning it can shrink down to one-quarter of its original diameter. This allows it to accommodate a wide range of cable and wire sizes, providing a tight, secure fit.

Q: What sizes are available and which should I choose?

A: This tubing is available in six inner diameter sizes: 4mm, 6mm, 8mm, 12mm, 16mm, and 20mm. Choose a size that is slightly larger than the diameter of the cable or connector you need to cover so the tubing can slide on easily before shrinking to a snug fit.

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

A: Cut the tube to the desired length, slide it over the wire or cable, and apply even heat using a heat gun or similar tool. The outer layer will shrink and the inner adhesive will melt and flow to create a sealed connection. Avoid open flames, as they can damage the tubing.