Fiberglass Car Fire Blankets for Electric Vehicles: Emergency Solution for Battery Thermal Runaway
2026-06-01
Introduction
On June 3, 2025, a cargo ship called the "Morning Midas" caught fire in the North Pacific Ocean. It was carrying 3,000 vehicles — 800 of them electric. The lithium-ion battery fires burned so intensely that the crew couldn't fight them. All 22 crew members had to abandon ship. Everyone survived, but the cargo didn't.
That story isn't an outlier. It's a preview of a problem that's going to get more common as EVs take up more road space, more parking structures, and more shipping lanes. And the uncomfortable reality is that most drivers — EV owners included — have no idea what to do if their car starts going into thermal runaway.
This article is about one specific tool that's increasingly being adopted as a first-response measure: the EV car fire blanket. What it is, why it works, and exactly how to use it.
Why EV Battery Fires Are a Different Problem Entirely
A petrol engine fire is dangerous. But it behaves in ways that are at least somewhat predictable — cut off the oxygen, and it dies. An EV lithium-ion battery fire doesn't follow the same rules.
The technical term is thermal runaway. When a lithium battery cell overheats — whether from a collision, a manufacturing defect, overcharging, or external heat exposure — it triggers a chain reaction. One cell heats the next. That cell heats another. The process generates its own oxygen internally, which means it can sustain combustion even in the absence of atmospheric air. Water alone won't stop it. A standard powder extinguisher won't stop it either.
What makes EV battery fires particularly difficult to manage:
| Challenge | Why It Matters in Practice |
| Self-sustaining reaction | Battery generates oxygen internally — can burn without external air supply |
| Extreme heat output | Temperatures can exceed 800°C in cell rupture events |
| Toxic gas release | Hydrogen fluoride and other hazardous gases released during thermal runaway |
| Re-ignition risk | Fire can reignite hours after appearing suppressed — sometimes days later |
| Underfloor battery location | Unlike engine fires, heat source is beneath the entire vehicle floor |
For more background on how lithium battery fires have played out in real-world transport scenarios, INSOFIRE covered the Morning Midas incident in detail: Cargo Ship Fire in Pacific with 800 EVs Highlights Lithium Battery Risks in Maritime Shipping.
Core Advantages of an EV Fiberglass Fire Blanket
So why does a fiberglass blanket work where other tools fall short? A few reasons — and they all come down to how the material behaves under extreme heat.
A high-quality electric vehicle fiberglass fire blanket doesn't burn. It doesn't melt at 300°C. It doesn't release fumes that add to an already toxic environment. And unlike water — which is sometimes used on EV fires in massive quantities — it doesn't create a secondary runoff hazard or risk electrical conductivity issues.
What it does is contain. The blanket wraps around the vehicle, cuts off the external oxygen supply, and slows the thermal runaway cascade enough to prevent it from spreading — to nearby vehicles, to structures, to people. It won't always extinguish the battery completely. With a severely compromised pack, nothing short of prolonged immersion in water will do that. But containment buys time. Time for evacuation. Time for fire services to arrive with the equipment to handle the rest.
Key performance comparison — EV fire suppression methods:
| Method | Cuts Off Oxygen | Handles Re-ignition Risk | Safe in Enclosed Spaces | Deployable in Under 60 Seconds |
| Standard Fire Extinguisher | Partially | No | No (powder hazard) | Yes |
| Water Hose | No | Partially | No | No |
| EV Fiberglass Fire Blanket | Yes | Yes (containment) | Yes | Yes |
| Immersion Tank | No | Yes | No | No |
The e-bike fire blanket uses the same core fiberglass technology, scaled for smaller lithium battery packs — worth knowing if you also use electric two-wheelers. For battery storage protection at rest, the LiPo battery fireproof bag is another layer of protection worth considering.
Emergency Operation Process — Step by Step
Speed matters in a thermal runaway event. But so does not doing something that makes things worse. Follow this sequence.
Step 1 — Do not open the car doors or hood If thermal runaway has started inside the battery pack, opening the vehicle introduces oxygen to an already volatile environment. Keep everything closed.
Step 2 — Move away from the vehicle immediately Get everyone — passengers, bystanders — at least 15 to 20 metres away. Toxic gases including hydrogen fluoride can be released within seconds of cell rupture. Don't wait to see if it gets worse.
Step 3 — Retrieve the blanket The battery thermal runaway fire blanket should be stored in an accessible location in the boot or rear compartment. Pull the release tab and shake the blanket fully open. This should take under 15 seconds.
Step 4 — Approach from upwind and deploy Hold the blanket by its corner handles — not the center. Walk toward the vehicle from the upwind side, lower the blanket over the entire vehicle in one motion, and ensure all four edges make contact with the ground. Any gap leaves an oxygen channel.
Step 5 — Retreat immediately Once deployed, don't stand near the vehicle. The heat conducted through the blanket is still significant, and toxic gas release continues even under containment.
Step 6 — Call emergency services and report EV fire Tell dispatchers specifically that it's an electric vehicle fire and that thermal runaway may be involved. This determines what equipment they'll bring. A standard engine fire and a battery fire require different responses. Keep everyone at a safe distance until professional crews have assessed and confirmed containment.
For a broader breakdown of small-scale fire suppression tactics and where blankets are most effective, this piece is worth reading: Emergency Fire Suppression of Small-Scale Fires: The Core Role of Fiberglass Fire Blankets.
Selection & On-Board Configuration for EVs
EV owners need to think about blanket sizing differently from petrol vehicle owners. The battery pack runs the full length of the vehicle floor — so the thermal footprint is much larger. A blanket that covers only the front half of the car is not doing its job.
| EV Type | Recommended Minimum Blanket Size |
| Small EV / City Car (e.g. Mini Electric) | 4.5m × 6m |
| Standard Sedan EV (e.g. Tesla Model 3) | 5m × 7m |
| SUV / Crossover EV (e.g. Model Y, ID.4) | 5m × 8m |
| Large SUV / Premium EV (e.g. EQS, iX) | 6m × 8m |
| Commercial EV Van | 6m × 9m |
When in doubt, go larger. The marginal cost difference between blanket sizes is small. The consequence of a blanket that doesn't fully seal the vehicle is not.
On storage: EV boots tend to be better organised than traditional cars — use that to your advantage. A purpose-made mounting bracket on the boot lid interior or a side-wall pouch keeps the bag accessible without consuming cargo space. Don't put it in the frunk if you have one — you won't be opening that in a fire event.
Conclusion
Electric vehicle fires aren't going to become less common. EV adoption is accelerating globally, and lithium battery incidents — whether from accidents, manufacturing defects, or extreme heat exposure — will follow proportionally. The infrastructure for handling them at a professional level is still catching up.
In the meantime, the most practical thing an EV owner can do is carry the right tool and know how to use it. A fiberglass battery thermal runaway fire blanket won't replace fire services. But it buys time — and in a fire event, time is the one resource you can't recover once it's gone.
Have questions about which blanket suits your specific EV model? The INSOFIRE FAQ covers common specification queries, or you can reach the team directly for tailored advice.
About INSOFIRE
INSOFIRE — InsoFire Material Technology Hangzhou Co., Ltd. — has specialised in fiberglass-based fire protection manufacturing since 1993. With over 30 years of material expertise and a 33,000 m² production facility, the company develops car fire blankets, e-bike fire blankets, standard fire blankets, and custom fireproof solutions for global clients across automotive, industrial, and commercial sectors. Products are certified to ISO, EN, ASTM, and AS/NZS standards. OEM and ODM production available. Contact: sales@insofire.com or explore the full product range.
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