450mm Heat Shrink Tubing — Reliable Large-Diameter Insulation for Battery Wraps & DIY Builds
When you're building or repairing battery packs, bus bars, or large wiring harnesses, finding heat shrink tubing wide enough to cover the job cleanly is a real challenge. Undersized sleeves split at the seams; tape unravels over time. This 450mm wide heat shrink tubing is designed for makers, EV hobbyists, and electricians who need a clean, durable insulation wrap for large-diameter components — without improvising.
Each piece is a large-diameter polyolefin heat shrink sleeve with a 450mm flat width (approximately 17.7"), available in lengths of 1 Meter (≈39.4"), 2 Meters (≈78.7"), and 3 Meters (≈118.1"). Color options include Black, Blue, and Transparent to suit different wiring conventions and inspection needs. The tubing applies a uniform, snug wrap when heated with a standard heat gun.
Typical use cases include wrapping DIY lithium battery packs and 18650 cell groups, insulating bus bars and cable bundles in solar or EV builds, and protecting large electrical connections in automotive and marine wiring projects — all common applications where standard heat shrink tubing for battery wraps falls short in diameter.
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Compatibility Note: This tubing is suited for large-format battery packs, grouped cell assemblies, bus bars, and cable bundles where a wide insulation sleeve is required. Verify your component's outer diameter fits within the tubing's shrunk inner diameter before applying heat.
✅ Key Features of These 450mm Heat Shrink Tubing Sleeves
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📏Extra-Wide 450mm Flat Width — Covers large-diameter battery packs, grouped 18650 cells, and oversized cable bundles that standard heat shrink tubing cannot accommodate.
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🔥Even Heat Activation — Shrinks uniformly with a standard heat gun, conforming tightly to irregular shapes without bubbling or splitting along the seam.
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🎨Three Color Options — Black for general insulation and UV resistance, Blue for circuit color-coding, and Transparent for builds where labels or cell markings need to remain visible.
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📐Flexible Length Selection — Available in 1m (≈39.4"), 2m (≈78.7"), and 3m (≈118.1") cuts, so you order only what your project requires and minimize waste.
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🛡️Moisture-Resistant Insulation — Polyolefin construction provides reliable electrical insulation and general moisture resistance for indoor and light outdoor wiring applications.
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⚡Low-Voltage Rated Sleeve — Generally suitable for low-voltage DIY electrical insulation applications including battery wrap insulation, solar wiring, and automotive harness protection.
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Spec Confirmation: Exact shrink ratio, activation temperature, and voltage rating vary by production batch. Please contact us to confirm specifications if your application has strict tolerances.
📐 Technical Specifications — Large-Diameter Heat Shrink Tubing
| Product Type |
Large-Diameter Heat Shrink Tubing / Battery Wrap Sleeve |
| Flat Width |
450mm (≈17.7") |
| Available Lengths |
1 Meter (≈39.4"), 2 Meters (≈78.7"), 3 Meters (≈118.1") |
| Colors |
Black, Blue, Transparent |
| Material |
Polyolefin (typically) |
| Shrink Ratio |
See variant options — contact us to confirm |
| Activation Temperature |
Generally 90°C–120°C (194°F–248°F) — contact us to confirm |
| Voltage Rating |
Generally up to 600V (low-voltage) — contact us to confirm |
| Waterproofing |
Moisture-resistant (standard wall); adhesive-lined not included |
| Recommended Tool |
Heat gun (open flame not recommended) |
| Quantity per Order |
1 piece per selected length |
❓ Frequently Asked Questions
How do I choose the right length of heat shrink tubing?
Measure the total length of the component or battery pack you need to cover, then add at least 10–15% extra to account for shrinkage along the length axis. For most battery packs, 1 meter (≈39.4") is sufficient for a single large cell or small pack, while 2–3 meter lengths suit longer bus bars or multi-cell assemblies.
What shrink ratio does this tubing use?
Large-diameter heat shrink tubing of this type typically uses a 2:1 shrink ratio, meaning the 450mm flat-width tube will shrink down to approximately 225mm in diameter when heat is applied. Confirm the exact ratio on the product label or contact us before ordering if your application requires a tighter fit.
What temperature is needed to shrink this tubing?
Most polyolefin-based heat shrink tubing in this size range generally activates at temperatures between 90°C–120°C (194°F–248°F). A heat gun is strongly recommended over an open flame for even, controlled shrinkage without scorching the material.
Can this tubing be used outdoors or in wet environments?
Standard polyolefin heat shrink tubing is generally moisture-resistant and suitable for light outdoor use. For fully waterproof applications, look for adhesive-lined (dual-wall) variants. Contact us to confirm the specific moisture rating for this product before use in submerged or high-humidity environments.
What is the voltage rating for this insulation sleeve?
Heat shrink tubing in this category is typically rated for low-voltage applications up to 600V. For high-voltage or industrial applications, please contact us to confirm suitability before purchase.
Which color should I choose — Black, Blue, or Transparent?
Black is the most common choice for general electrical insulation and UV resistance. Blue is useful for color-coding circuits or battery packs by polarity or circuit type. Transparent allows you to see labels, markings, or cell details through the sleeve — ideal for inspection builds or display projects.
Is this tubing compatible with lithium battery packs and 18650 cells?
Yes. The 450mm flat width is well-suited for wrapping large-format lithium battery packs, grouped 18650 cell assemblies, and similar DIY energy storage builds. Always verify the pack's outer diameter fits within the tubing's shrunk inner diameter before applying heat.
🛒 Select your color and length above, then add to cart — ships from our US warehouse.
