Can Camphor Catch Fire in a Hot Car?

Camphor, a common household substance, can indeed catch fire when exposed to high temperatures, particularly when a car is parked in the sun. This article explores the conditions under which camphor can ignite and discusses the science behind its flammability. By understanding the flash point and auto-ignition temperature of camphor, you can better understand why it is important to store this flammable material carefully.

Understanding Camphor's Properties

When a car is parked in the sun, the interior temperatures can rise to levels above 80°C (175°F), which is the ignition point of camphor. This heat can cause the camphor to sublimate, converting directly from a solid to a gas without passing through the liquid stage. Sublimation of camphor in a closed environment can lead to the creation of flammable vapors. If these vapors come into contact with an ignition source, they can ignite, posing a fire hazard.

Auto-Ignition Temperature vs. Flash Point

It is important to distinguish between the auto-ignition temperature and the flash point of a substance. The auto-ignition temperature is the temperature at which a substance will ignite spontaneously in the presence of air in the absence of a spark or flame. The flash point, on the other hand, is the temperature at which the vapor of the substance ignites when exposed to a flame. Camphor has a flash point of 152°F (66°C) and an auto-ignition temperature of 869°F (466°C).

Improper Storage and Fire Hazards

Given these properties, it is crucial to avoid leaving camphor in a hot car. Even if the auto-ignition temperature is high, the flash point of camphor means that it can catch fire if exposed to sufficient heat. Research indicates that in a car parked in direct sunlight, the interior can reach temperatures well above 50°C in summer. These conditions can cause camphor to sublimate and create a flammable atmosphere inside the car.

Practical Advice for Safe Storage

To prevent fire hazards and ensure the safety of camphor, it is recommended to store it in a cool, dry place away from direct sunlight and heat sources. If you must store it in a car, keep the windows slightly open to ensure proper air circulation, or use a storage container that can maintain a stable temperature. Additionally, avoid storing large quantities of camphor in a closed space, as this can increase the risk of vapor buildup.

Conclusion

In conclusion, while camphor's auto-ignition temperature is significantly higher than the temperatures typically found in a parked car, its flash point and the conditions under which it can sublimate mean that it can still pose a fire hazard if not stored properly. By taking proactive measures to manage the storage environment of camphor, you can significantly reduce the risks associated with this flammable substance.

Keywords: camphor, ignition temperature, flash point