Black Heat Shrink Tubing 2:1 — 0.6mm to 30mm Wire & Cable Sleeving

Measure the outer diameter of your wire or cable. Choose a heat shrink size where the expanded inner diameter is at least 10–20% larger than your wire. With a 2:1 shrink ratio, the tubing shrinks to approximately half its listed diameter. For example, 4mm tubing shrinks to approximately 2mm. For very fine wires (e.g. 0.6mm–1mm), use the smallest available size and verify fit before cutting a long piece.

A 2:1 shrink ratio means the tubing shrinks to approximately half its original expanded diameter when heat is applied evenly. The listed diameter is the pre-shrink expanded size. For example, 10mm tubing will shrink to approximately 5mm after heating. Always verify your wire dimensions against the selected variant before ordering.

Black polyolefin heat shrink tubing is generally suitable for automotive underhood wiring, marine cable protection, and light outdoor use. The black color provides UV resistance compared to clear or colored variants. For long-term outdoor submersion or direct burial applications, additional weatherproofing measures are typically recommended. Contact us to confirm suitability for your specific environment.

A heat gun is recommended for even, controlled shrinkage across all sizes. For smaller diameters (0.6mm–4mm), a lighter or hair dryer can work in a pinch, but a heat gun gives the most consistent results. Apply heat in a slow sweeping motion from the center outward to avoid trapping air. For larger diameters (15mm and above), a heat gun with adjustable temperature settings is strongly recommended to ensure even shrinkage without scorching.

Yes. Polyolefin heat shrink tubing is generally electrically insulating and is widely used for insulating wire splices, protecting exposed conductors, and covering solder joints in automotive, marine, and electronics applications. Always verify the voltage rating is appropriate for your specific application before use. Contact us if you need confirmation of the dielectric rating for a particular use case.

For covering a single solder joint or wire splice, 20–50mm (approx. 1"–2") of tubing is typically sufficient for smaller diameters. For longer cable runs or harness protection, calculate the total length needed and add 10–15% for trimming and positioning. The 1M and 2M options are ideal for small repairs; the 10M, 20M, and 25M lengths suit larger projects or ongoing electronics and automotive wiring work. Note that not all diameter and length combinations are available — check the variant selector for your chosen size.

This black heat shrink tubing is typically used for insulating solder joints and wire splices in electronics and PCB repair, protecting fine wires in automotive wiring harnesses and control panels, covering connector pins and terminal ends, providing strain relief on headphone cables, USB cords, and power tool leads, and color-coding or bundling wire runs in marine electrical installations. The wide diameter range (0.6mm–30mm) makes it suitable for everything from ultra-fine signal wire to mid-size cable protection.