4:1 Transparent Heat Shrink Tubing — 1 Meter, 2mm to 10mm

Measure the outer diameter of the wire, connector, or bundle you need to cover. Choose a size where the pre-shrink inner diameter is at least 10–20% larger than your component. With a 4:1 ratio, the tubing will shrink down to roughly one-quarter of its original diameter — so a φ8mm (≈5/16") tube recovers to approximately 2mm (≈5/64"), giving you a wide working range per size. When in doubt, size up rather than down.

A 4:1 shrink ratio means the tubing shrinks to approximately one-quarter of its supplied diameter when heat is applied. This is significantly more than standard 2:1 tubing, making it suitable for irregular shapes, stepped connectors, and bundled cables where a tight, conforming seal is needed. It also means one size can cover a broader range of substrates.

Transparent 4:1 heat shrink tubing is generally dual-wall construction with an inner adhesive lining that melts and flows during shrinking to create a moisture-resistant seal around the substrate. This makes it suitable for outdoor wiring, marine applications, and environments with occasional moisture exposure. For full submersion, confirm the specific adhesive rating before use.

Most 4:1 polyolefin heat shrink tubing begins to shrink at around 90°C (194°F) and fully recovers at approximately 120°C (248°F). A heat gun is the recommended tool — use a sweeping motion to avoid scorching. A lighter or match can work in a pinch but risks uneven shrinking or clouding the transparent material.

Yes, polyolefin heat shrink tubing is generally rated for outdoor and automotive use. It typically offers UV resistance, a wide operating temperature range (commonly −55°C to +125°C / −67°F to +257°F), and resistance to fuels, oils, and mild chemicals. Verify the specific product datasheet for exact ratings before use in safety-critical applications such as fuel lines or high-voltage systems.

Each variant includes 1 meter (≈39.4 inches) of tubing in your chosen diameter. If you need longer runs, simply add multiple units of the same size to your cart. Contact us if you need bulk quantities or custom cut lengths — we're happy to help.

In most cases, the tubing remains visually clear after shrinking, allowing you to see wire colors, labels, or solder joints underneath. Applying excessive heat or holding the heat gun too close can cause slight clouding or yellowing, so use a steady, sweeping motion at the recommended distance (typically 5–10 cm / 2–4 inches from the surface).