Measure the section of wire or cable you need to cover and add at least 10–15mm (about 1/2") of overlap on each end. For 35mm diameter tubing, a length of 50mm (≈2") is typically sufficient for most connector and splice applications. Longer runs are available for continuous cable protection — see the variant options above.

A 2:1 shrink ratio means the tubing will shrink to approximately half its original diameter when heat is applied. So this 35mm tubing will shrink down to roughly 17.5mm (≈11/16"), conforming tightly around the cable or connector for a secure, insulated finish.

Polyolefin heat shrink tubing generally provides a dielectric strength suitable for low- to medium-voltage applications, typically up to 600V. It also generally withstands continuous operating temperatures up to 125°C (257°F). Always verify your specific application requirements and contact us if you need certified data.

Standard polyolefin heat shrink tubing is generally resistant to moisture, UV exposure, and mild chemicals, making it suitable for many outdoor and under-hood applications. For harsh marine or direct-burial environments where a fully waterproof seal is required, a dual-wall adhesive-lined heat shrink variant is typically recommended.

A heat gun is the most reliable tool — apply heat evenly by moving the gun along the length of the tubing rather than holding it in one spot. In a pinch, a lighter can work for small sections, but a heat gun gives more consistent results and reduces the risk of scorching or uneven shrinkage.

35mm (≈1-3/8") inner diameter tubing is designed for larger cables, wire bundles, and connectors. It typically fits cable bundles or individual cables with an outer diameter up to approximately 35mm before shrinking. After shrinking, it conforms to cables as small as roughly 17–18mm in diameter, making it a versatile choice for large harness wraps and battery cable insulation.

Most standard polyolefin heat shrink tubing is manufactured to be RoHS compliant and free of hazardous substances. If compliance documentation is required for your project or application, please contact us to confirm the specific certification status for this SKU before ordering.