3:1 Adhesive-Lined Heat-Shrink Tubing Ø12.7–4.23 mm Black – 1 m

This adhesive-lined heat-shrink tubing provides electrical insulation, mechanical protection and additional sealing for cables, terminals, connectors and electrical joints.

When heated, the tubing shrinks around the component. At the same time, the adhesive lining melts and fills the space between the tubing and cable, helping prevent the ingress of moisture, dust and other contaminants.

Its 3:1 shrink ratio provides greater versatility than conventional 2:1 tubing. It can pass over larger connectors or irregular shapes before shrinking tightly around the cable.

Manufactured from black polyolefin, it provides good mechanical, electrical and environmental resistance. The one-metre length can be cut to the required size before installation.

Main features

• Type: dual-wall heat-shrink tubing
• Internal lining: hot-melt adhesive
• Outer material: polyolefin
• Shrink ratio: 3:1
• Diameter before shrinking: 12.7 mm
• Fully recovered diameter: 4.23 mm
• Length: 1 m
• Colour: black
• Operating temperature: –55 to +125 °C
• Application: hot-air shrinking
• Can be cut to the required length
• Provides electrical insulation
• Protects against abrasion and mechanical stress
• Adhesive helps protect against moisture and dust
• Suitable for cables, terminals, plugs and connectors
• Sold: individually in one-metre lengths

Main advantages

• High 3:1 shrink ratio
• Fits cables and joints with different diameters
• Internal adhesive for improved sealing
• Reinforces and protects connection points
• Clean and professional finish
• Easy to cut and apply
• Suitable for electrical, electronic and automotive use

Recommended applications

• Insulating electrical connections
• Protecting terminals and solder joints
• Sealing connectors
• Repairing cable insulation
• Reinforcing cable exits from plugs
• Antenna and radio communication cables
• Automotive and marine installations
• Electronics and telecommunications
• Cable identification and organisation
• Protection against moisture and abrasion

Application instructions

1. Cut the tubing to the required length.
2. Slide it onto the cable before making the joint or fitting the connector.
3. Position the tubing over the area to be protected.
4. Heat it evenly using a hot-air gun.
5. Continue heating until fully recovered and a small amount of adhesive appears at the ends.
6. Allow it to cool before moving the cable.

Important note

Before installation, make sure the 12.7 mm initial diameter will pass over the widest component and that the 4.23 mm recovered diameter is small enough to grip the cable securely.

A hot-air gun is recommended. Avoid direct flames, as they may burn the tubing, damage the cable insulation or cause uneven shrinking.

The adhesive improves moisture resistance, but the final seal depends on correct surface preparation and application. Do not assign a specific IP rating to the completed assembly without appropriate testing.