A fire extinguisher is a mandatory attribute of a car first aid kit, but there are many myths surrounding it. One of the most frightening: “Could it explode right in the cabin or trunk?” Spoiler: yes, it can, but only in case of gross violation of operating rules or extreme conditions. In this article we will analyze physical reasons, in which even a certified fire extinguisher turns into a bomb, and we will also give specific recommendationshow to avoid an emergency.
According to statistics from the Ministry of Emergency Situations, up to 15 cases of spontaneous activation or rupture of fire extinguishers in vehicles are recorded in Russia every year. The main culprits are: powder models (OP) and carbon dioxide (OU), but even they burst for a reason. We analyzed reports from auto experts and manufacturers to highlight 5 Critical Risk Factors, which are silent in the instructions.
Important: if you store a fire extinguisher in your car “just in case” without updating it for 5+ years, the chances of an explosion increase significantly. Next - details with analysis real case of explosion of an OP-2 powder fire extinguisher in the trunk Toyota RAV4 2021 at +60°C.
Why a fire extinguisher can explode: the physics of the process
Any fire extinguisher is a sealed pressure vessel. An explosion occurs when internal pressure exceeds the strength of the hull. For automobile models, the critical point is from 15 to 30 atmospheres (depending on the material of the cylinder). The causes of a pressure surge are divided into two groups:
- 🔥 Thermal: overheating in the sun, fire in the cabin, contact with hot engine parts.
- ⚗️ Chemical: cylinder corrosion, reaction of powder with moisture, gas expiration.
For example, in powder fire extinguishers (OP) working pressure is created by inert gas (nitrogen, argon). When heated to +50°C, the gas expands, and at +60°C the pressure can exceed the norm by 40%. Carbon dioxide (CO) is even more dangerous: CO₂ at +30°C it goes into a supercritical state, and the cylinder bursts like a tin can.
Case study: in 2022 Novosibirsk fire extinguisher exploded OP-4(z) in the trunk Kia Sportageparked in direct sunlight. The reason is a combination of overheating (+58°C in the cabin) and microcracks in the weld seam of the cylinder. Consequences: the trunk lid was torn and the rear window was damaged.
Top 5 reasons why fire extinguishers explode in cars
An analysis of incidents showed that 87% of explosions occur due to human factors. Here are the key triggers:
- Expired date. Powder fire extinguishers serve 5–10 years, carbon dioxide - up to 15. After this, corrosion and loss of tightness are inevitable. For example, in OP-2 after 8 years the powder cakes and the gas escapes through micropores.
- Storing in the wrong place. The trunk next to the muffler, the glove compartment above the heating radiator - new errors. Temperatures in these areas can reach +70°C.
- Mechanical damage. An impact from an accident, a fall from a height, scratches from tools - all this weakens the body.
- Homemade "modernizations". Attempts to recharge a fire extinguisher using a makeshift method or replacing the gas with a cheaper one (for example, air instead of nitrogen).
- Manufacturer defect. Cheap models (for example, "Torch" or "Rime") often have thin-walled cylinders (1–1.2 mm thick instead of the standard 1.5 mm).
Particularly risky fire extinguishers with plastic heads - they melt at +120°C, blocking the pressure relief valve. As a result, the balloon ruptures “at the seam”.
What to do if the fire extinguisher has already started to hiss?
If a hissing sound is heard from the cylinder or white smoke (carbon dioxide) is visible, immediately:
1. Stop the vehicle in a safe place.
2. Open the windows - the gas is toxic!
3. Carefully carry the fire extinguisher at a distance of at least 10 m from the car (use gloves - the container may be hot).
4. Do not try to extinguish it with water - this will accelerate corrosion and rupture.
5. Call the Ministry of Emergency Situations by phone 112 (in Russia) or 101 (in Belarus/Kazakhstan).
Which fire extinguishers explode more often: comparison of types
Not all fire extinguishers are equally dangerous. We analyzed the data Rostesta and GOST R 51057-2001to create a risk rating:
| Fire extinguisher type | Risk of explosion (1–10) | Reason | Service life |
|---|---|---|---|
| Powder (OP) | 8 | High operating pressure (up to 16 atm), sensitivity to moisture and overheating | 5–10 years |
| Carbon dioxide (CO) | 7 | Liquefied CO₂ expands when heated, risk of frostbite when triggered |
10–15 years |
| Air foam (AFP) | 4 | Low pressure (6–8 atm), but is afraid of freezing (the foaming composition may crystallize) | 10 years |
| Water (OW) | 3 | Minimum pressure, but not suitable for extinguishing electrical equipment | 10 years |
Conclusion: powder fire extinguishers explode most often, but their popularity is due to their versatility (they extinguish fire classes A, B, C, E). Carbon dioxide is safer, but requires caution during storage - the cylinder must be strictly vertical!
⚠️ Attention: Never store the fire extinguisher in a horizontal position! In powder models, this leads to caking of the powder, and in carbon dioxide models, it leads to gas leakage through the valve.
How to check a fire extinguisher for safety: step-by-step instructions
To avoid surprises, inspect your fire extinguisher every 3 months. Here's the checklist:
External inspection for corrosion and dents|
Checking the pressure gauge (arrow should be in the green zone)|
Check the expiration date (on the label)|
Checking seals and checks (not broken?)|
Gas leak test (shake the cylinder - can you hear gurgling?) -->
Pay special attention pressure gauge:
- Green zone - pressure is normal.
- Red zone — gas is leaking or the cylinder is overheated.
- Missing arrow — a defective fire extinguisher (found in cheap Chinese models).
If there is no pressure gauge (as in some OU-2), check the weight: the cylinder must weigh no less than the value indicated on the label. For example, OP-4 weighs ~7 kg when charged. If the weight is 10% or more less, gas leaks.
Take a photo of the fire extinguisher label when purchasing. It shows the date of manufacture, serial number and technical specifications. This data will be useful for warranty service or authentication verification (counterfeit fire extinguishers often do not have serial numbers).
What to do if a fire extinguisher explodes: algorithm of actions
If an emergency has already occurred, the main thing is not to panic. Follow the steps:
- Evacuate. Move 15–20 m away from the car. Fragments of the cylinder can fly 50+ meters.
- Check for gas leaks. Carbon dioxide (
CO₂) is colorless, but its high concentration causes dizziness. Signs: hissing, white fog near the ground. - Don't touch the shards. They may be hot (up to +100°C) or have sharp edges.
- Call the rescuers. Report what happened pressure vessel rupture - this will change the protocol of their actions.
- Don't try to put out leftovers. If the fire extinguisher is partially activated, pressure may remain inside.
After the incident, be sure to:
- File a report with the traffic police (if the explosion damaged the car).
- Save the fragments of the cylinder for examination (this will help to recover damages from the manufacturer if it is his fault).
- Check your MTPL/CASCO insurance - some policies cover damage from a fire extinguisher explosion.
⚠️ Attention: If a fire extinguisher explodes in the cabin, don't drive until completely ventilated! Carbon dioxide, even in small concentrations, reduces the reaction and causes drowsiness.
How to choose a safe fire extinguisher for your car: expert recommendations
When purchasing, pay attention to 4 key parameters:
- 🏷️ Certification. There must be a sign on the cylinder GOST R or EAC (Eurasian Union). Avoid models labeled "TU"(technical specifications) are often fakes.
- 🔧 Housing material. Optimally - steel with a thickness of 1.5 mm. Aluminum cylinders are lighter but less durable.
- ⚖️ Weight and volume. Sufficient for a passenger car OP-2 (2 kg powder) or OU-2 (2 kg
CO₂). Trucks need OP-5. - 📅 Expiration date. Powder fire extinguishers last up to 10 years, carbon dioxide ones - up to 15. The date of manufacture must be stamped on the bottom of the cylinder (not on the sticker!).
The best models in terms of price/safety ratio (according to "Behind the Wheel" 2023):
- 🥇 OP-2(z)-AVE-01 («Lightning") - powder, with a pressure gauge and anti-corrosion coating.
- 🥈 OU-3 («Frost") - carbon dioxide, with an ergonomic handle and protection against static electricity.
- 🥉 OVP-4(z) («Buran") - air-foam, safe for electronics (unlike powder ones).
The cost of a high-quality fire extinguisher is from 800 to 2500 rubles. Saving 200–300 rubles can turn into an explosion!
Carbon dioxide fire extinguishers (CO) cannot be stored in the trunk in winter at temperatures below -20°C! CO₂ turns into a solid state, and the container may burst when thawed.
Myths about fire extinguishers: what is really dangerous and what is not
There are a lot of rumors surrounding car fire extinguishers. Let's look at the most popular:
| Myth | Reality |
|---|---|
| “A fire extinguisher explodes from the impact of an accident” | No. The housing is designed to withstand impact loads of up to 300 J. There is a risk only when balloon puncture (for example, with a sharp object). |
| “You can recharge the powder fire extinguisher yourself” | Danger! Without special equipment, it is impossible to accurately dose gas. The risk of overpressure is 90%. |
| "Carbon dioxide fire extinguishers do not explode" | They explode, but less often. The main danger is frostbite when triggered (temperature at the socket -70°C). |
| “A fire extinguisher in a car is required only for technical inspection” | By Traffic rules of the Russian Federation (clause 7.7), absence of a fire extinguisher - a fine of 500 rubles. But most importantly, it saves lives! |
Another common fear: “If the fire extinguisher goes off in the cabin, I'll choke on the powder." In fact, the powder (eg. ABCE) is non-toxic, but irritates the respiratory tract. All you have to do is open the windows and step away from the car.
FAQ: Frequently asked questions about fire extinguishers in the car
Can a fire extinguisher explode due to the heat in a car in the summer?
Yes, if the temperature in the cabin exceeds +50°C. Critical for powder fire extinguishers (OP) - their gas expands by 3-5% for every degree above normal. Carbon dioxide (CO) can withstand up to +60°C, but at +70°C an explosion is inevitable.
What to do? Park in the shade, use sunscreens, and better yet, take a fire extinguisher with you (for example, in your bag).
How often should you check the fire extinguisher in your car?
Minimum once every 3 months — external inspection and checking the pressure gauge. Once a year - complete diagnostics at a certified center (cost ~300 rubles). Fire extinguishers older than 5 years should be checked every 6 months.
According to GOST R 51017-2009, recharging of powder fire extinguishers is mandatory every 5 years, carbon dioxide - every 10 years.
Is it possible to store a fire extinguisher in the trunk in winter?
It is possible, but with reservations:
- Powder (OP) can withstand up to -40°C.
- Carbon dioxide (CO) - only up to -20°C (below CO₂ freezes and the container may burst when thawed).
- Air-foam (AFP) are afraid of freezing - the foam crystallizes.
The optimal solution: keep a fire extinguisher in the cabin (under the seat) or use thermal cover.
What to do if the fire extinguisher is rotten (expired)?
Do not throw it in regular trash! Hand over to recycling point (their addresses can be found on the website Recyclemap). Some service centers accept old fire extinguishers at a discount on new ones.
Do not puncture the balloon under any circumstances! Even an “empty” fire extinguisher may contain residual gas under pressure.
Which fire extinguisher is better - powder or carbon dioxide?
The choice depends on the tasks:
- Powder (OP): universal (extinguishes burning liquids, electrical wiring, solid materials), but leaves dirt and can damage electronics.
- Carbon dioxide (CO): Ideal for electrical equipment (leaves no residue), but ineffective outdoors (gas dissipates quickly).
Optimal for most car owners OP-2 - it is cheap, compact and covers 90% of possible fires in a car.