Yellow & Green Heat Shrink Tubing 2:1 — Φ3mm to Φ50mm, Fire Resistant, Soft PVC Sleeving

Measure the outer diameter of your bare wire or bundle. Choose a heat shrink size whose pre-shrink inner diameter is typically 20–30% larger than the wire OD. With a 2:1 shrink ratio, the tubing will shrink down to approximately half its original diameter, creating a snug, secure fit. For example, a Φ10mm tube will shrink to roughly Φ5mm — ideal for a wire with a 4–5mm OD.

A 2:1 shrink ratio means the tubing shrinks to approximately half its original inner diameter when heat is applied. So Φ10mm becomes roughly Φ5mm, Φ20mm becomes roughly Φ10mm, and so on. This ratio is the most common for general-purpose electrical sleeving and works well for most wire and cable sizes.

This tubing generally provides basic moisture resistance once properly shrunk. For prolonged outdoor exposure, direct water contact, or submersion, an adhesive-lined (dual-wall) heat shrink tubing is typically recommended to achieve a fully waterproof seal. Contact us to confirm suitability for your specific environment.

Yes. This heat shrink tubing is made with a fire-resistant (flame-retardant) PVC compound that helps slow the spread of flame in the event of an electrical fault. This is an important safety feature for grounding and earthing wire applications in panels, enclosures, and junction boxes.

Yellow and green is the internationally recognized color code for protective earth (ground) conductors, as defined by IEC 60446 and adopted in most national electrical standards including NEC (US) and BS 7671 (UK). Using this color ensures compliance and makes grounding wires immediately identifiable during inspection or maintenance — reducing the risk of accidental disconnection.

A heat gun is the recommended tool — apply even heat around the tubing at typically 70–110°C (158–230°F) until it conforms to the wire. For smaller diameters (generally Φ6mm and below), a lighter can be used carefully in a pinch, but a heat gun provides more consistent, controlled results and is strongly preferred for larger sizes.

As a general guide: Φ3mm fits wires up to approximately AWG 18–20; Φ6mm fits AWG 12–14; Φ10mm fits AWG 8–10; Φ16mm fits AWG 4–6; Φ25mm fits AWG 1–2; and Φ40–50mm is suited for cable bundles or conduit ends. Always measure your wire's actual outer diameter before selecting a size, as insulation thickness varies by manufacturer.

Yes. The tubing is supplied in continuous lengths (1M, 3M, 5M, 10M, 20M) and can be cut to any length with scissors or a utility knife before or after shrinking. Cutting before shrinking is generally easier and gives cleaner ends. This makes it straightforward to cover exactly the section of wire you need without waste.