Quadrios 25CA503 Adhesive-Lined Heat Shrink Tubing, Transparent, 25.4 mm Diameter, 1.2 m Length, 3:1 Ratio

For electricians and technicians who need durable, waterproof seals on cable splices and connectors, the Quadrios 25CA503 adhesive-lined heat shrink tubing delivers reliable insulation in harsh environments. With a 3:1 shrink ratio, it compresses from 25.4 mm down to 8.5 mm, conforming tightly around irregular shapes. The transparent polyolefin jacket allows visual inspection of the bond underneath, while the inner adhesive melts during shrinking to create a moisture-resistant barrier. Use it in automotive wiring, marine electronics, or outdoor installations where protection from water, chemicals, and abrasion is critical. The tubing is 1.2 m long and can be cut to the exact length needed for each joint.

Key specifications

• Adhesive lined: Yes
• Shrink ratio: 3:1
• Inner diameter before shrinking: 25.4 mm
• Inner diameter after shrinking: 8.5 mm
• Length: 1.2 m
• Colour: Transparent
• Material: Polyolefin
• Operating temperature range: -55 °C to +125 °C
• Minimum shrink temperature: >110 °C
• Dielectric strength: 15 kV/mm
• Voltage rating: 600 V
• Flammability rating: UL VW-1
• RoHS compliant: Yes
• Wall thickness (recovered): 2.5 mm

Why choose it

The adhesive lining flows into gaps and voids during shrinking, creating a seal that resists water ingress and corrosion. The transparent jacket lets you confirm the adhesive has fully covered the connection without cutting the tubing open. Its wide operating temperature range makes it suitable for both cold climates and engine compartments.

Ideal use cases

• Waterproofing wire splices in automotive and marine applications
• Insulating connections in outdoor lighting and irrigation systems
• Protecting cable joints from chemicals and abrasion in industrial settings

Good to know

Heat the tubing evenly with a heat gun until it fully recovers and the adhesive oozes slightly from the ends. Allow it to cool before flexing the joint. The tubing is RoHS compliant and meets UL VW-1 flammability standards.