Large Diameter PVC Heat Shrink Tubing — Reliable Insulation for Big Cables & Battery Packs
When you're working on large battery packs, thick cable bundles, or industrial wiring harnesses, standard heat shrink just doesn't cut it. Electricians, EV builders, solar installers, and DIY enthusiasts all face the same frustration: finding heat shrink tubing wide enough to cover oversized conductors without splitting or leaving gaps. That's exactly what this large diameter PVC heat shrink tubing is designed to solve.
Each piece is made from flexible PVC material and is sold in flat (flattened) widths ranging from 268mm (≈10.6") to 625mm (≈24.6"). The tubing is available in 1, 2, 3, or 5-piece packs, and comes in six color options — Black, Blue, Fruit Green, Silver Grey, Transparent, and Green — making it easy to color-code your projects. Shrink ratio is typically 2:1, meaning the tubing shrinks to approximately half its flat width diameter when heat is applied.
Typical use cases include insulating large lithium battery packs and 18650 cell groups, sleeving thick welding cables or marine wiring, protecting bus bars and copper busbars in solar or EV systems, and bundling oversized conduit or pipe for storage and shipping. The transparent variant is especially popular for large diameter heat shrink wrap for battery packs where visual inspection is needed after sealing.
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Compatibility: Suitable for cables, battery packs, bus bars, and cylindrical objects with an outer diameter up to approximately half the listed flat width. Select your width based on the circumference or diameter of the object you need to cover — see FAQ below for guidance.
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Note: Width listed is the flattened (lay-flat) width, not the expanded diameter. Please measure your object and refer to the size selection FAQ before ordering to ensure a proper fit.
✅ Key Features of These Large Diameter PVC Heat Shrink Tubes
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📏Wide Size Range — Flat widths from 268mm (≈10.6") to 625mm (≈24.6") cover everything from thick cable bundles to large battery pack heat shrink applications.
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🎨Six Color Options — Black, Blue, Fruit Green, Silver Grey, Transparent, and Green allow easy color-coding of circuits, phases, or cable groups in complex wiring systems.
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🔥Even Heat Shrinkage — PVC construction provides uniform shrinkage around irregular shapes, creating a snug, wrinkle-free sleeve ideal for large diameter heat shrink wrap for battery packs and bus bars.
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🛡️Electrical Insulation — Provides a protective insulating layer over exposed conductors, terminals, and solder joints, reducing the risk of short circuits in high-current applications.
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✂️Cut-to-Length Flexibility — Each piece can be cut to your required length before shrinking, making it adaptable for battery cell wrapping, cable end sealing, or full-length sleeving.
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📦Multi-Pack Value — Available in 1, 2, 3, or 5-piece packs so you can stock up for ongoing projects or grab a single piece for a one-off repair without overspending.
📐 Technical Specifications — Large Diameter PVC Heat Shrink Tubing
| Material |
PVC (Polyvinyl Chloride) |
| Flat Width Range |
268mm (≈10.6") – 625mm (≈24.6") |
| Shrink Ratio |
Typically 2:1 |
| Colors Available |
Black, Blue, Fruit Green, Silver Grey, Transparent, Green |
| Packing Options |
1 Pcs, 2 Pcs, 3 Pcs, 5 Pcs |
| Shrink Temperature |
Typically 70–90°C (158–194°F) — contact us to confirm for your specific size |
| Wall Thickness (before shrink) |
See variant options |
| Length per Piece |
See variant options / Contact us to confirm |
| Application |
Battery packs, cable insulation, bus bars, wiring harnesses, pipe bundling |
| Suitable Object Diameter |
Generally up to ~50% of the flat width (e.g., 268mm flat ≈ up to ~170mm OD) |
❓ Frequently Asked Questions
How do I choose the right flat width for my cable or battery pack?
Measure the outer circumference of your object, then divide by 2 to get the minimum flat width you need. For example, if your battery pack has a circumference of 500mm, you'd need at least a 250mm flat width — so the 268mm option would be a good starting point. Always size up slightly to allow the tubing to slide over the object before shrinking. As a general rule: flat width ≈ (object OD × π) ÷ 2. If you're unsure, contact us with your object's diameter and we'll help you select the right size.
What is the shrink ratio, and how much will the tubing shrink?
This PVC heat shrink tubing generally has a 2:1 shrink ratio, meaning it will shrink to approximately half its original expanded diameter when heat is applied. For example, a 300mm flat width tube (≈190mm expanded diameter) will typically shrink down to around 95mm in diameter. Actual shrinkage may vary slightly depending on the specific size and heat applied.
Can this tubing be used outdoors or in wet environments?
PVC heat shrink tubing generally provides good moisture resistance once shrunk, making it suitable for many indoor and sheltered outdoor applications. However, for fully waterproof or submersible applications, we recommend using adhesive-lined (dual-wall) heat shrink tubing instead. If you need outdoor UV resistance for extended periods, please contact us to confirm suitability for your specific environment.
Is this compatible with lithium battery packs and 18650 cell groups?
Yes — large diameter heat shrink wrap for battery packs is one of the most common uses for this product. The wide flat width range (268mm–625mm) makes it suitable for covering assembled battery modules, cell groups, and pack enclosures. The transparent option is particularly useful when you want to inspect the cells or labeling after sealing. Always verify the flat width against your pack's circumference before ordering.
What heat source should I use to shrink this tubing?
A heat gun is the recommended tool for shrinking large diameter PVC tubing evenly. Move the heat gun slowly and evenly around the tubing to avoid hot spots or uneven shrinkage. A standard heat gun set to 70–90°C (158–194°F) typically works well, though exact temperatures may vary by size. Avoid using open flames, as they can scorch or melt the PVC unevenly.
How do I decide between buying 1, 2, 3, or 5 pieces?
If you're doing a single repair or prototype, the 1-piece option lets you test the fit and shrinkage before committing to more. For ongoing projects — like building multiple battery packs or sleeving a batch of cables — the 3 or 5-piece packs offer better value per piece. Multi-pack pricing is reflected in the variant pricing shown above.
Can I cut the tubing to a shorter length before shrinking?
Yes. PVC heat shrink tubing can be cut to any length with scissors or a utility knife before applying heat. Cut it slightly longer than needed, slide it into position, then apply heat. The tubing will shrink radially (in diameter) much more than longitudinally, so plan your cut length accordingly — in most cases, longitudinal shrinkage is minimal (typically less than 10%).
🛒 Select your width, color, and quantity above, then add to cart — ships from our US warehouse.
