Heat Shrink Tubing 2:1 Ratio — 1m Lengths, φ60mm to φ210mm, Multiple Colors

Measure the outer diameter of the cable or bundle you need to cover. Choose a tubing size whose expanded (pre-shrink) inner diameter is larger than your cable — typically 20–30% larger for a secure fit. For example, a φ60mm tube generally suits cable bundles up to about 50mm in diameter. After shrinking at a 2:1 ratio, the tubing will recover to roughly half its original diameter. When in doubt, size up.

A 2:1 shrink ratio means the tubing will shrink to approximately half its original expanded diameter when heat is applied. For example, a φ60mm tube will shrink down to roughly φ30mm (≈1.18"), conforming tightly around the cable or component inside. This ratio is the most common standard for general-purpose electrical insulation and cable management.

This heat shrink tubing is generally rated for electrical insulation in low-to-medium voltage environments. It provides a durable dielectric barrier that helps prevent short circuits, abrasion damage, and moisture ingress. For specific voltage ratings applicable to your installation, please contact us to confirm before use in high-voltage or safety-critical applications.

Standard polyolefin heat shrink tubing typically offers good resistance to moisture and mild environmental exposure, making it suitable for many outdoor wiring and cable management tasks — including automotive underhood wiring, marine cable runs, and exterior conduit terminations. For prolonged submersion or highly corrosive environments, contact us to confirm the specific material rating before ordering.

A heat gun is the most reliable tool for shrinking this tubing evenly. Set the heat gun to a medium-high setting and move it steadily along the length of the tube to avoid scorching or uneven shrinkage. A lighter or match can work for very short sections in a pinch, but a heat gun gives more consistent results — especially for larger diameters like φ80mm and above where even heat distribution matters most.

Yes. The range of diameters — from φ60mm to φ210mm — is designed to accommodate a wide variety of cable bundles, conduit ends, pipe joints, and large-gauge wiring harnesses. Smaller diameters (φ60–φ80mm) typically suit mid-size cable bundles, while larger sizes (φ150–φ210mm) are generally used for industrial conduit, pipe insulation, or large harness protection in equipment enclosures and control panels.

The colors are primarily for identification and organization — for example, color-coding wiring harnesses by circuit, phase, or system. All color variants in this listing generally share the same 2:1 shrink ratio and insulation properties. The transparent option is particularly useful when you need to read cable markings, wire gauges, or identification labels through the tubing after installation.