Measure the outer diameter of your cable or bundle before shrinking. Choose a supplied (expanded) tube diameter that is roughly 20–30% larger than your cable's OD so the tube slides on easily. After shrinking at a 2:1 ratio, the recovered diameter will be approximately half the supplied size. For example, a 20mm tube recovers to roughly 10mm — ideal for a cable bundle measuring 8–10mm across. When in doubt, size up one step rather than down.

A standard electric heat gun set to 90°C–120°C (194°F–248°F) is generally sufficient. Move the heat gun slowly and evenly along the tube to avoid scorching. A lighter or torch can work in a pinch for small diameters, but is not recommended for larger sizes (25mm and above) as uneven heat can cause bubbling or incomplete shrinkage.

Recovered polyolefin heat shrink tubing is generally resistant to moderate mechanical abrasion and provides good tensile strength along the sleeve. It is not a structural fastener — it will not prevent a connector from pulling off a wire under high tension. For high-vibration or high-pull-force applications, combine the tubing with a proper crimp or solder joint. Exact tensile and tear strength values vary by diameter; contact us to confirm for your specific size.

Polyolefin heat shrink tubing is generally moisture-resistant and performs well in outdoor and marine cable protection applications when properly applied. However, this is a standard (non-adhesive-lined) tubing, so it does not create a fully waterproof seal at the ends. For submersed or salt-spray environments, consider using adhesive-lined (dual-wall) heat shrink tubing instead, or seal the ends with marine-grade silicone after shrinking.

Yes — the diameter range (10mm–45mm) covers a wide span of AWG wire sizes and multi-conductor cable bundles commonly used in US automotive, marine, and industrial wiring. The 10mm size is typically suitable for bundles of 4–6 AWG wires, while the 45mm size can accommodate large cable bundles or conduit-style applications. Always verify the expanded and recovered diameters against your specific cable OD before ordering.

For occasional repairs and small projects (a few splices or connector ends), the 25M (≈82 ft) roll is generally sufficient. For workshop or shop use where you're regularly making harnesses or bundling cables, the 50M (≈164 ft) roll offers a good balance of quantity and cost. The 100M (≈328 ft) roll is best suited for production runs, fleet maintenance, or contractors who use large-diameter sleeving regularly. Larger rolls typically offer a lower cost-per-meter.

Compliance certifications vary by production batch and diameter. If your application requires UL listing, RoHS compliance, or a specific military/aerospace standard, please contact us with your diameter and quantity requirements before placing your order so we can confirm the applicable certifications for that variant.