Measure the outer diameter (OD) of the cable or bundle you need to cover. Choose a heat shrink tube with a recovered (after-shrink) diameter slightly smaller than your cable's OD. With a 2:1 ratio, the tube shrinks to approximately half its listed diameter — for example, a 60mm (≈2.4") tube recovers to roughly 30mm (≈1.2"). When in doubt, size up to ensure the tube slides on easily before shrinking.

A 2:1 shrink ratio means the tubing will shrink to approximately half its original supplied diameter when heat is applied. For example, a 100mm (≈3.9") tube will recover to roughly 50mm (≈2.0"). This ratio is generally suitable for most standard wire bundling, insulation, and cable loom sleeving applications.

Standard 2:1 polyolefin heat shrink tubing typically activates at around 90°C (194°F) and fully recovers at approximately 120°C (248°F). A heat gun is the recommended tool for even, controlled shrinkage. Avoid open flames, as uneven heat can cause irregular shrinkage or damage the tubing surface.

Standard polyolefin heat shrink tubing generally offers good resistance to UV exposure, moisture, and mild chemicals, making it suitable for many outdoor and marine cable protection applications. However, for prolonged submersion or extreme environments, an adhesive-lined (dual-wall) variant is typically recommended for a watertight seal. Contact us to confirm suitability for your specific application.

Standard 2:1 polyolefin heat shrink tubing is generally rated for up to 600V, making it suitable for most low-voltage electrical wiring, automotive harnesses, and marine cable protection. Contact us to confirm the exact rating for your specific use case before use in safety-critical applications.

Yes. The large diameter range (60mm–180mm) makes this tubing well-suited for bundling multiple wires or cable looms together. Measure the total outer diameter of the bundle and select a tube size that, after shrinking, will hold the bundle snugly. The 2:1 ratio gives you a reliable, firm grip on the bundle for clean automotive wiring harness builds or RV cable management.

The black color is a standard choice for heat shrink tubing and generally provides slightly better UV resistance compared to clear or light-colored variants. It also gives a clean, professional appearance for automotive, industrial, and electrical installations where aesthetics matter alongside function.

Slide the tubing over the cable or bundle before making any connections (if possible). Position it over the area to be covered. Apply heat evenly along the length of the tube using a heat gun, moving in a slow, sweeping motion. The tubing will begin to shrink within seconds. Work from the center outward to avoid trapping air bubbles. Allow to cool before handling.