PVC Heat Shrink Tubing 7–110mm | Wire Insulation Wrap | 24 Colors

Measure the outer diameter (OD) of your wire or connector, then select a variant whose Φ (inner diameter) is slightly larger than that measurement. For example, a wire with a 4mm OD fits the 7mm flat / Φ4mm size. After shrinking, the tubing will grip the wire tightly. As a general rule, choose a size whose recovered diameter is at least 10–20% smaller than the object being covered. If you're between sizes, go one size up.

Quick reference: 7mm flat = Φ4mm | 9mm flat = Φ5mm | 12mm flat = Φ7mm | 15mm flat = Φ9mm | 17mm flat = Φ10.8mm | 23mm flat = Φ14.5mm | 29.5mm flat = Φ18mm | 31mm flat = Φ20mm | 36mm flat = Φ22mm | 43mm flat = Φ27mm | 45mm flat = Φ28mm | 50mm flat = Φ32mm | 60mm flat = Φ38mm | 66mm flat = Φ42mm | 70mm flat = Φ44mm | 75mm flat = Φ48mm | 80mm flat = Φ50mm | 85mm flat = Φ55mm | 91mm flat = Φ58mm | 95mm flat = Φ60mm | 110mm flat = Φ70mm

PVC heat shrink tubing generally has a 2:1 shrink ratio, meaning it shrinks to approximately half its original inner diameter when heat is applied. For example, the Φ4mm variant will typically recover to around Φ2mm. This ensures a snug, secure fit over most standard wire gauges. Longitudinal shrinkage is generally minimal — typically less than 5%.

PVC heat shrink tubing typically activates at around 70–90°C (158–194°F). A heat gun set to low or medium is the recommended tool — it provides even, controlled heat distribution. Open flames (lighters, torches) are generally not recommended, as they can scorch, melt unevenly, or discolor the tubing. A hair dryer may work for smaller sizes but may not generate enough heat for larger diameters.

PVC tubing generally provides good moisture resistance and is suitable for sheltered or short-term outdoor use — for example, protecting wire connections inside an engine bay or under a deck. For prolonged UV exposure, saltwater environments, or applications requiring a waterproof seal, an adhesive-lined polyolefin heat shrink tubing is typically a better choice, as it creates a sealed barrier when shrunk.

Yes. The Φ (inner diameter) listed in each variant corresponds to the maximum wire or bundle diameter it can accommodate before shrinking. As a general guide:

• Φ4mm — typically fits up to ~22–24 AWG single wire
• Φ7mm — typically fits up to ~18–20 AWG or small wire bundles
• Φ14.5mm and above — suitable for multi-conductor cables, connectors, and larger harnesses

Always measure your wire's actual OD rather than relying solely on AWG, as insulation thickness varies by manufacturer.

Absolutely — that's one of the most popular uses. With 24 available colors including black, white, red, blue, green, yellow, transparent, silver-grey, fruit green, lake blue, army green, gold, and more, you can build a consistent color-coding system across your entire wiring harness. This makes future troubleshooting, maintenance, and circuit identification significantly faster and less error-prone.

Each unit contains 1 meter (≈39.4 inches) of heat shrink tubing in your chosen size and color. If your project requires more, simply add multiple units of the same variant to your cart. There is no minimum order quantity.