2:1 Heat Shrink Tubing – Wire & Cable Insulation Sleeve, Dia. 0.6mm–80mm, 600V/1KV

Measure the outer diameter (OD) of the wire, connector, or splice you need to cover. Then select a heat shrink tube whose recovered diameter (approximately half the supplied size for 2:1 tubing) is slightly smaller than that measurement to ensure a snug fit. For example, if your wire bundle measures 8mm (≈5/16") OD, a Φ18mm tube will recover to roughly 9mm — a good fit. When in doubt, size up one step to allow easy insertion before heating.

A 2:1 shrink ratio means the tubing will shrink to approximately half its original supplied inner diameter when heat is applied. For example, a Φ20mm (≈3/4") tube will recover to roughly Φ10mm (≈3/8"). This ratio is generally suitable for most standard wire bundling, insulation, and strain-relief applications. If you need a tighter recovery ratio for irregular shapes, a 3:1 or 4:1 adhesive-lined tube may be more appropriate — contact us for options.

This polyolefin tubing typically begins to shrink at around 70–90°C (158–194°F), with full recovery occurring at approximately 120°C (248°F). A heat gun is the recommended tool — move it slowly and evenly along the tube to avoid hot spots. Avoid using open flames (lighters, torches), which can scorch, discolor, or unevenly shrink the sleeve and may damage the underlying wire insulation.

Standard polyolefin heat shrink tubing generally provides good resistance to moisture, UV exposure, and mild chemicals once fully recovered, making it commonly used in outdoor wiring, marine cable protection, and automotive harness repair. However, for fully waterproof sealed connections, a dual-wall adhesive-lined heat shrink tube is typically recommended, as the inner adhesive layer melts and seals around the conductor. Contact us if you need adhesive-lined options.

The 600V-rated tubing is suitable for most residential, commercial, and light industrial wiring applications — including household electrical repairs, automotive wiring, and low-voltage control systems. The 1KV-rated option provides a higher dielectric strength and is generally used in industrial power distribution, motor wiring, and applications where higher voltage insulation is required. Always select the voltage rating that meets or exceeds the requirements of your specific installation.

Yes. Polyolefin heat shrink tubing is widely used in automotive wiring harness repair, connector insulation, terminal protection, and wire splice covering. It generally withstands the temperature ranges and vibration conditions found in engine bays and under-dash installations. For high-heat zones near exhaust components or turbochargers, verify the specific temperature rating of the tubing before use, as those areas may exceed standard polyolefin limits.

In addition to diameter shrinkage, heat shrink tubing typically shrinks 5–15% in length when fully recovered. As a general rule, cut the tubing at least 5–10mm longer than the area you need to cover on each end to account for this lengthwise shrinkage. For critical applications, test a short sample piece first to measure the actual length recovery for your specific diameter and heating method.