Heat Shrink Tubing 2:1 — Reliable Insulation for Every Wire and Cable Job
Whether you're chasing a wiring fault under the dashboard, tidying up a home automation install, or protecting outdoor cable runs from moisture, loose or exposed wires are a constant frustration. Heat shrink tubing 2:1 ratio gives electricians, hobbyists, and DIYers a clean, durable way to insulate, bundle, and identify cables without tape that unravels or connectors that corrode.
Each roll is made from flexible polyolefin material and is available in diameters from 12mm (≈0.47") to 18mm (≈0.71"), with lengths from 1m (≈3.3 ft) to 50m (≈164 ft). Seven color options — Black, White, Red, Green, Yellow, Blue, and Transparent — make color-coded wiring identification straightforward on any project.
Typical use cases include automotive wiring harness repair, marine cable protection, electrical panel wire bundling, and DIY electronics projects where heat shrink wire connectors need a clean finish. The 2:1 shrink ratio suits the vast majority of general-purpose insulation and strain-relief applications.
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Compatibility: Suitable for copper, aluminum, and stranded wire. Works with standard heat guns, soldering station hot-air attachments, and similar tools. Verify recovered diameter against your cable OD before ordering — see FAQ below for sizing guidance.
✅ Key Features of These Heat Shrink Tubes
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🔥2:1 Shrink Ratio — Shrinks to approximately half its original diameter, providing a snug, uniform fit over cables, terminals, and connectors without gaps or loose ends.
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📏Six Diameter Options — Available in 12mm, 13mm, 14mm, 15mm, 16mm, and 18mm to match a wide range of cable sizes, from thin control wires to heavier power cables.
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🎨Seven Color Choices — Black, White, Red, Green, Yellow, Blue, and Transparent allow color-coded wire identification in automotive, marine, and panel wiring applications.
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🛡️Polyolefin Construction — Offers resistance to moisture, mild chemicals, and abrasion, making it suitable for both indoor electrical work and general outdoor cable protection.
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📦Flexible Length Options — Choose from 1m, 2m, 5m, 10m, or 50m rolls to match your project scale, from a single splice repair to a full wiring harness installation.
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⚡Rated for General Electrical Use — Typically rated up to 600V for standard low-voltage wiring, suitable for automotive, marine, home, and light industrial heat shrink wire insulation tasks.
📐 Technical Specifications — Heat Shrink Tubing 2:1
| Product Type |
Heat Shrink Tubing / Sleeve |
| Shrink Ratio |
2:1 |
| Available Diameters |
12mm (≈0.47"), 13mm (≈0.51"), 14mm (≈0.55"), 15mm (≈0.59"), 16mm (≈0.63"), 18mm (≈0.71") |
| Available Lengths |
1m (≈3.3 ft), 2m (≈6.6 ft), 5m (≈16.4 ft), 10m (≈32.8 ft), 50m (≈164 ft) |
| Colors |
Black, White, Red, Green, Yellow, Blue, Transparent |
| Material |
Polyolefin |
| Shrink Temperature |
Typically begins at 70–90°C (158–194°F); full recovery at approx. 120°C (248°F) |
| Voltage Rating |
Generally up to 600V (contact us to confirm for specific diameter) |
| Wall Thickness (pre-shrink) |
See variant options |
| Operating Temperature Range |
Contact us to confirm |
| Application |
Wire insulation, cable bundling, connector protection, strain relief |
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Sizing tip: Always measure your cable's outer diameter before selecting a size. The listed diameter is the tubing's inner diameter before shrinking. After shrinking, it will recover to approximately half that size.
❓ Frequently Asked Questions
How do I choose the right diameter of heat shrink tubing?
Measure the outer diameter of the cable or connector you need to cover, then select a heat shrink size whose recovered (post-shrink) diameter is slightly smaller than that measurement. For example, 12mm (≈0.47") tubing typically recovers to around 6mm (≈0.24"), so it suits cables up to approximately 11mm in diameter. When in doubt, size up — you can always apply more heat to shrink further, but you cannot un-shrink tubing that is too small.
What does 2:1 shrink ratio mean?
A 2:1 shrink ratio means the tubing will shrink to approximately half its original diameter when heat is applied. For example, 18mm (≈0.71") tubing will generally recover to around 9mm (≈0.35"). This ratio is the most common for general-purpose electrical insulation and wire bundling applications.
How much heat is needed to shrink the tubing?
These tubes typically begin to shrink at around 70–90°C (158–194°F) and fully recover at approximately 120°C (248°F). A heat gun is the recommended tool. A lighter or match can work in a pinch but may cause uneven shrinkage or scorching. Always apply heat evenly by moving the heat source along the tubing rather than holding it in one spot.
Can this heat shrink tubing be used outdoors?
Standard polyolefin heat shrink tubing generally offers good resistance to moisture, UV exposure, and mild chemicals, making it suitable for many outdoor cable protection applications. However, for prolonged submersion or extreme UV environments, an adhesive-lined or marine-grade variant is typically recommended. Contact us to confirm suitability for your specific outdoor use case.
What is the voltage rating of this tubing?
Polyolefin heat shrink tubing in this size range is generally rated for up to 600V in standard electrical applications. For high-voltage or industrial-grade requirements, please contact us to confirm the exact rating for the specific diameter you need.
How do I choose the right length?
Measure the total length of cable runs, splices, or connectors you need to cover, then add 10–15% extra for trimming and overlap. For occasional repairs, 1m (≈3.3 ft) or 2m (≈6.6 ft) rolls are typically sufficient. For workshop use or larger wiring projects, 5m or 10m rolls offer better value. The 50m (≈164 ft) roll is ideal for contractors or production environments.
Is this tubing compatible with automotive wiring?
Yes, polyolefin heat shrink tubing is widely used in automotive wiring harnesses, connector insulation, and terminal protection. It is generally resistant to engine bay temperatures, oils, and vibration. For under-hood applications near high heat sources, verify the tubing's continuous operating temperature against your specific environment before installation.
🛒 Select your color, diameter, and length above, then add to cart — ships from our US warehouse.
