25.4mm (1") Dual Wall Heat Shrink Tubing 3:1 Ratio Adhesive Lined Waterproof — Multiple Colors & Lengths

Measure the section of wire or connector you need to cover, then add at least 10–15mm (about 1/2") of overlap on each end. For example, a 50mm (2") splice typically needs a 70–80mm piece. We offer 1m (≈3.3 ft), 2m (≈6.6 ft), 5m (≈16.4 ft), and 10m (≈32.8 ft) lengths — choose based on how many connections you need to cover in your project.

The inner adhesive layer melts and flows during shrinking, creating a mechanical bond around the substrate. This generally provides a firm, strain-relief grip that resists pull-out forces and helps prevent moisture wicking along the wire. Exact tensile values depend on the substrate material and surface condition — for load-bearing or safety-critical applications, contact us to confirm specifications.

Yes. The adhesive-lined dual wall construction creates a waterproof seal that is generally suitable for outdoor, marine, and high-humidity environments. The outer polyolefin jacket typically resists UV exposure and moisture ingress. It is widely used for boat wiring, dock electrical connections, and outdoor lighting installations.

This tubing has a supplied inner diameter of 25.4mm (1") and shrinks to approximately 8.5mm (≈1/3") at a 3:1 ratio. It is generally compatible with wire bundles, connectors, and terminals up to about 25mm in outer diameter before shrinking. Always measure your connector's outer diameter and confirm it falls within the supplied ID before ordering.

Dual wall adhesive-lined polyolefin tubing typically begins to shrink at around 90°C (194°F), and the inner adhesive activates at approximately 120°C (248°F). A heat gun is strongly recommended for even, controlled shrinking. Avoid open flames — they can scorch or char the outer jacket and result in an uneven seal.

Color is typically used for circuit identification and organization. Black is the most common for general wiring. Red and Blue are often used for positive/negative polarity coding in 12V automotive and marine systems. Transparent allows you to see the underlying wire or printed label through the tubing. Yellow and Green are popular for ground or safety wiring in some industry conventions. All colors share the same adhesive-lined dual wall construction.

Yes. Dual wall adhesive-lined heat shrink tubing is widely used in automotive, RV, trailer, and camper van wiring applications where vibration resistance and moisture protection are important. The adhesive lining helps prevent corrosion at splice points and terminal connections, which is a common cause of electrical failures in vehicles exposed to road salt and humidity.