HellermannTyton Thick-Walled Adhesive-Lined Heat Shrink Tubing 12/3 mm, 1.2 m, Black 321-50190

In electrical workshops and field installations, technicians use this thick-walled heat shrink tubing to seal and protect cable splices, connectors, and terminations. The internal adhesive lining melts during shrinking, creating a moisture-resistant barrier that prevents corrosion and ensures reliable insulation in demanding environments.

Key specifications

• Type: Thick-walled heat shrink tubing
• Material: Cross-linked polyolefin
• Shrink ratio: 4:1
• Expanded diameter: 12 mm
• Recovered diameter: 3 mm
• Length: 1.2 m
• Colour: Black
• Adhesive lined: Yes
• Operating temperature: -40 °C to +120 °C
• Minimum shrink temperature: +120 °C
• Dielectric strength: 15 kV/mm
• Tensile strength: 15 MPa
• Elongation at break: 400%
• Water absorption: < 0.1%
• UV resistance: Good
• Chemical resistance: Good against common fluids and solvents
• Flammability: Self-extinguishing
• Halogen-free: Yes

Why choose it

The 4:1 shrink ratio allows the tubing to slide over large connectors and then shrink down to a tight fit on small cables. The internal adhesive provides a waterproof seal, making it suitable for outdoor and underground applications. The thick wall offers excellent mechanical protection against abrasion and impact.

Ideal use cases

• Insulating and sealing cable joints in automotive, marine, and industrial environments
• Protecting splices from moisture, chemicals, and mechanical stress
• Repairing damaged cable insulation
• Bundling and strain relief for wire harnesses

Good to know

The tubing is halogen-free and self-extinguishing, reducing toxic fumes in the event of fire. It withstands a wide temperature range, from -40 °C to +120 °C, making it suitable for both cold and hot climates. The black colour provides UV resistance for outdoor use.