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

Keep your wiring safe, sealed, and professional-looking with this Dual Wall Heat Shrink Tubing with Adhesive Glue Lining. Available in six diameters — 4, 6, 8, 12, 16, and 20mm — this 4:1 shrink-ratio tubing provides robust electrical insulation, moisture sealing, and strain relief for cables, connectors, and wire splices in a wide range of applications.

Made from high-quality polyethylene (PE) with an inner layer of hot-melt adhesive, this heat shrinkable tubing creates a tight, waterproof seal when heated. It's ideal for automotive wiring, marine applications, electronics projects, and outdoor electrical work where protection from moisture, dust, and corrosion is essential.

Made in Mainland China.

Key Features

• 4:1 Shrink Ratio – Shrinks to one quarter of its original diameter for a snug, secure fit around cables and connectors
• Dual Wall Construction – Outer PE shell for strength and insulation; inner adhesive glue layer for a waterproof, airtight seal
• 6 Size Options – Available in 4mm, 6mm, 8mm, 12mm, 16mm, and 20mm to suit a wide variety of wire gauges and connector types
• Moisture & Corrosion Resistant – Hot-melt adhesive flows into gaps upon heating, protecting against water ingress and oxidation
• Electrical Insulation – Provides reliable dielectric protection for wire joints, terminals, and cable repairs
• PE Material – Durable, flexible, and resistant to common chemicals and UV exposure
• Wide Application – Perfect for automotive, marine, aerospace, electronics, and home DIY wiring projects

Specifications

• Material: Polyethylene (PE) with inner hot-melt adhesive
• Shrink Ratio: 4:1
• Available Sizes (Inner Diameter): 4mm, 6mm, 8mm, 12mm, 16mm, 20mm
• Type: Dual Wall Heat Shrinkable Tubing
• Battery Required: No
• Origin: Mainland China

How to Use

1. Select the appropriate tube diameter for your cable or connector
2. Slide the tubing over the area to be covered before connecting wires
3. Position the tube over the joint or splice
4. Apply even heat (heat gun recommended) and watch the tube shrink to form a tight, sealed barrier

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

Learn more: Heat-shrink tubing

Frequently Asked Questions

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

A: This heat shrink tubing has a 4:1 shrink ratio, meaning it shrinks down to one quarter of its original inner diameter when heat is applied. This makes it ideal for covering a wide range of cable and connector sizes with a single tube diameter.

Q: Does this heat shrink tubing provide a waterproof seal?

A: Yes. The dual wall design features an outer polyethylene shell and an inner layer of hot-melt adhesive. When heated, the adhesive melts and flows around the cable or connector, creating a waterproof, moisture-resistant seal — perfect for marine, automotive, and outdoor electrical applications.

Q: What sizes are available and how do I choose the right one?

A: This tubing is available in 4mm, 6mm, 8mm, 12mm, 16mm, and 20mm inner diameters. To choose the correct size, measure the outer diameter of the cable or connector you need to cover and select a tubing size that is slightly larger before shrinking — the 4:1 ratio ensures a tight fit after heating.

Q: What tool is recommended for shrinking this tubing?

A: A heat gun is the recommended tool for shrinking this tubing evenly and efficiently. Apply heat gradually and move the gun along the length of the tube to ensure uniform shrinkage and proper adhesive flow throughout.