Heat Shrink Tubing That Grips, Seals, and Protects — Built for Real Wiring Jobs
Loose wires, exposed splices, and unprotected cable bundles are a headache for automotive technicians, marine riggers, and home DIYers alike. Whether you're chasing an electrical gremlin under the dash or weatherproofing a garden lighting run, you need cable sleeving that shrinks cleanly, holds firm, and keeps moisture out — without slipping off before the heat gun even touches it.
Each piece of this heat shrink tubing is 1 metre (≈3.3 ft) long and available in two expanded inner diameters — φ30mm (≈1-3/16") and φ40mm (≈1-9/16") — with a 2:1 shrink ratio that recovers to approximately 15mm (≈9/16") and 20mm (≈13/16") respectively. Made from flexible polyolefin with a non-slip textured surface, it is available in six colors: Black, Red, Green, Yellow, Purple, and White, making color-coded wiring organization straightforward.
Typical applications include automotive wiring harness protection, battery terminal insulation, marine cable bundling, garden and outdoor electrical connections, and workshop tool cord repair — anywhere a durable, waterproof cable heatshrink sleeve is needed to keep wiring tidy and protected from abrasion, moisture, and vibration.
🔌 Compatible with standard round cables, wire bundles, and connectors. Fits cables with an OD up to approximately 15mm for the φ30mm variant and up to approximately 20mm for the φ40mm variant. Works with heat guns, soldering station hot-air attachments, and similar controlled heat sources.
✅ Key Features of These Heat Shrink Tubing Sleeves
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🔥2:1 Shrink Ratio — Recovers to roughly half its expanded diameter, creating a snug, form-fitting seal around cables, splices, and connectors without leaving gaps.
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💧Waterproof Recovery — Once fully shrunk, the tubing forms a water-resistant barrier suitable for automotive, marine, and outdoor wiring exposed to moisture and humidity.
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✋Non-Slip Textured Surface — The exterior texture prevents the sleeve from sliding along the cable during positioning and provides a secure grip after installation — useful for vibration-prone automotive environments.
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🎨Six Color Options — Black, Red, Green, Yellow, Purple, and White allow straightforward color-coding of wiring circuits, making identification and maintenance faster in complex harnesses.
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✂️Cut-to-Length Flexibility — Each 1 metre (≈3.3 ft) piece can be trimmed to any shorter length with scissors or a utility knife; cut ends do not fray or unravel.
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📐Two Diameter Options — The φ30mm (≈1-3/16") and φ40mm (≈1-9/16") expanded sizes cover a wide range of cable bundle diameters, from individual wires to multi-conductor harnesses.
📐 Technical Specifications — Heat Shrink Tubing Sleeving
| Product Type |
Heat Shrink Tubing / Cable Heatshrink Sleeving |
| Shrink Ratio |
2:1 |
| Expanded Inner Diameter |
φ30mm (≈1-3/16") or φ40mm (≈1-9/16") — see variant options |
| Recovered Inner Diameter (approx.) |
~15mm (≈9/16") for φ30mm variant; ~20mm (≈13/16") for φ40mm variant |
| Length per Piece |
1 Metre (≈3.3 ft) |
| Material |
Polyolefin (flexible, RoHS-compliant grade typically used) |
| Surface Finish |
Non-slip textured exterior |
| Available Colors |
Black, Red, Green, Yellow, Purple, White |
| Activation Temperature |
Typically begins shrinking at ~70–90°C (158–194°F); full recovery at ~120°C (248°F) |
| Water Resistance |
Water-resistant when fully recovered |
| Recommended Heat Source |
Heat gun or hot-air tool (open flame not recommended) |
| Quantity per Order |
See variant options |
⚠️ Sizing note: Always measure your cable or bundle outer diameter before ordering. The expanded ID must be larger than your cable OD for easy insertion; the recovered ID should be smaller than your cable OD for a secure fit. If you are unsure, contact us to confirm compatibility.
❓ Frequently Asked Questions
How do I choose the right diameter heat shrink tubing for my cable?
Measure the outer diameter of your cable or bundle before shrinking. As a general rule, choose a tube whose recovered (post-shrink) inner diameter is slightly smaller than your cable OD, and whose expanded ID is at least 10–20% larger than the cable OD for easy insertion. For this product, the φ30mm (≈1-3/16" expanded) variant is typically suited for cables or bundles up to about 15mm (≈9/16") in diameter after shrinking, and the φ40mm (≈1-9/16" expanded) for bundles up to about 20mm (≈13/16").
What temperature is needed to shrink this tubing?
2:1 ratio polyolefin heat shrink tubing generally begins to shrink at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A heat gun set to medium-high is typically sufficient. Avoid open flames, which can cause uneven shrinkage or scorching.
Is this heat shrink tubing waterproof and suitable for outdoor or automotive use?
This tubing provides a water-resistant seal once fully recovered around the cable. It is generally suitable for automotive wiring, marine environments, and outdoor electrical connections. For fully submersed or high-pressure water exposure, an adhesive-lined (3:1) variant is typically recommended.
What does 2:1 shrink ratio mean?
A 2:1 shrink ratio means the tubing will shrink to approximately half its original expanded inner diameter when heat is applied. For example, the φ40mm variant will recover to roughly 20mm (≈13/16") after full shrinkage, creating a tight sleeve around your cable or connector.
Can I use this tubing on automotive wiring harnesses?
Yes. The non-slip textured surface and waterproof recovery make this tubing well-suited for automotive wiring harness protection, battery terminal insulation, and cable bundling in engine bays. The φ40mm size is commonly used for larger harness bundles, while φ30mm works well for individual wire runs and smaller sub-harnesses.
Does the color affect performance?
No — all color variants (Black, Red, Green, Yellow, Purple, White) share the same 2:1 shrink ratio and material properties. Color choice is typically used for color-coding wiring systems, circuit identification, or aesthetic preference in visible installations.
Can I cut this tubing to shorter lengths?
Yes. Each piece is 1 metre (≈3.3 ft) long and can be cut to any shorter length with scissors or a utility knife before or after application. Cut ends do not fray, so no additional finishing is needed.
🛒 Select your color, diameter, and length above, then add to cart — ships from our US warehouse.
