A TPU cable is a cable whose outer jacket is made of thermoplastic polyurethane, a flexible, tough plastic that sits between rubber and hard plastic. In an EV charging cable, TPU is the protective skin, not the part that carries current: the current flows through copper conductors inside. TPU itself is an electrical insulator, so it is not conductive. Buyers choose it because it stays flexible in the cold and resists abrasion, oil and being driven over better than many basic jackets.
Key Takeaways
- TPU is thermoplastic polyurethane, a flexible and abrasion-resistant jacket material.
- TPU is an insulator; copper conductors inside the cable carry the current.
- TPU usually outperforms PVC for cables used outdoors and in the cold.
- Check certification, conductor size and temperature range, not just the jacket name.
What Material Is TPU?
TPU is a thermoplastic elastomer. It is made from polyurethane chemistry, but unlike traditional rubber it can be melted and extruded like a plastic. That gives it two useful traits at once: it bends and springs back like rubber, and it can be processed in high volume on standard cable extrusion lines.
Cable makers can adjust hardness, color and additives such as UV stabilizers and flame retardants. That is why two “TPU” cables can feel quite different in the hand. The name tells you the base polymer, not the full recipe.
Is TPU Conductive?
No. Standard TPU is an insulating material. In a charging cable, the layers usually work like this:
- Copper conductors carry the charging current and the ground (earth) path.
- Core insulation around each conductor separates them electrically.
- Signal wires carry the pilot and proximity signals the car and charger use to communicate.
- The outer jacket, often TPU, protects everything from abrasion, water, sunlight and crushing.
So “TPU cable” describes the jacket. The conductor size and the cable’s certification determine how much current it can safely carry. Our guide to whether all EV charging cables are the same explains how rating and construction differ.
TPU vs PVC vs Rubber Jackets
Each jacket material involves trade-offs. The table compares them in general terms; exact performance depends on the compound and the cable standard it is certified to.
| Jacket | Strengths | Limitations | Typical use |
|---|---|---|---|
| TPU | Abrasion and oil resistance, stays flexible in cold, good tear strength | Usually costs more than PVC | EV charging cables, portable chargers, outdoor leads |
| PVC | Low cost, easy to process, widely available | Can stiffen in cold weather; less abrasion resistance | Indoor power cords, building wiring sheaths |
| Rubber (e.g. EPDM, CR) | Very flexible, good heat and weather resistance | Heavier; slower, costlier processing | Industrial and heavy-duty flexible cables |
A charging cable lies on the ground, gets stepped on and is coiled daily, often in winter. That is why many manufacturers prefer TPU or a similar elastomer for the jacket. See our article on cold-weather charging for how low temperatures affect cables.
What This Means for Buyers and Importers
When you source chargers or cables, do not stop at “TPU jacket” on a datasheet. Ask for the cable’s certification for your market, the conductor cross-section, the rated temperature range and test reports for the finished cable assembly. For private-label projects, jacket color and finish can usually be customized, but the cable must still meet the certified construction.
EVDANCE portable chargers such as the EV-ACS4005T 40A NACS portable charger (IP66, 25 or 28 ft cable) and the EV-ACS3210E 32A Type 2 portable charger are built for daily outdoor use. Brands can discuss cable options through our OEM and private-label program.
Frequently Asked Questions
Is TPU waterproof?
TPU itself does not absorb much water, but a cable assembly’s water resistance depends on its seals and connectors. Check the IP rating of the complete charger or cable.
Can a damaged TPU jacket be taped?
No. If the jacket is cut and inner layers show, stop using the cable and have it replaced. Tape does not restore the rated protection.
Is TPU better than PVC for EV cables?
For cables handled outdoors every day, TPU is usually the more durable choice. PVC can be acceptable for indoor or fixed uses where flexibility and abrasion matter less.
Related Reading
- Do EV Charging Cables Get Hot?
- How Long Do EV Charging Cables Last?
- Choosing Plug, Cable and Connector for an OEM Charger by Market
- IP Ratings for EV Chargers: IP54, IP65 and IP66 Compared
