What are the flash point and ignition point of gasoline?

[SanKimberly]

Gasoline has a flash point of -50 to -20°C and an ignition point of 427°C. Below are the detailed explanations: Flash point: The flash point is a safety indicator for the storage, transportation, and use of flammable liquids, as well as a measure of their volatility. Flammable liquids with a low flash point have high volatility, are prone to ignition, and have poorer safety. Ignition point: The ignition point refers to the minimum temperature required for a material's surface to catch fire and sustain combustion for a certain duration under specified test conditions, using an external heat source. When a combustible material is fully exposed to a hot surface, small ignition sources such as electric heating wires or radiant energy (like moderate electric spark discharges) can potentially cause ignition.

[AshlynLynn]

I remember gasoline has a very low flash point, around minus 43 degrees Celsius, and can easily ignite with just a little evaporation. The ignition point is much higher, at least 280 degrees Celsius or more, even up to over 400 degrees. This low flash point is particularly dangerous, especially when working in the garage during summer. As soon as you open a gasoline can, you can smell the strong gasoline fumes, and a single spark could be disastrous. Last time I was fixing my car, I accidentally spilled gasoline on the concrete floor. When I wiped it with a mop, the static electricity nearly set the mop on fire, scaring me into immediately opening the windows for ventilation. So, if you store gasoline at home, always use a sealed metal container, and don’t cut corners by using plastic bottles.

[DeSpencer]

The flash point of gasoline is very low, around -43°C, which is even colder than Harbin in winter! On the other hand, its ignition point is quite high, usually starting at 280°C. A low flash point means it's extremely easy to catch fire. For example, when I was cleaning the carburetor yesterday, the gasoline I just poured out started emitting vapor at room temperature. If someone were to smoke or use an electric tool to spark at that moment, the vapor would instantly ignite. However, the high ignition point has its benefits—without a spark plug, the gasoline in the car won't self-ignite, so it won't combust spontaneously in the engine. It's especially important to tighten the fuel tank cap after refueling; otherwise, gasoline vapor could escape and come into contact with the hot pipes under the chassis, which would be no joke.

[BrodyLynn]

The flash point of gasoline is approximately -43°C, while the ignition point is typically above 280°C. Such a low flash point is truly alarming, as even an ordinary lighter can ignite gasoline vapors. Remember to turn off your engine when refueling at gas stations, as the engine temperature alone is sufficient to ignite the vapors. The higher ignition point provides some safety, indicating that gasoline won't spontaneously combust under normal storage conditions. I once saw someone using gasoline to clean parts—the moment the rag got wet, sparks from a nearby cutting machine flew over, causing flames to instantly shoot up. That's why specialized cleaning agents are now preferred. Gasoline should also be stored away from radiators, and the kitchen is definitely not suitable—how dangerous it would be to have it near an open flame while cooking.

[BrooklynDella]

The flash point of gasoline is around -43°C, while its ignition temperature is at least 280°C. These two temperatures differ significantly. The low flash point indicates it produces abundant vapor and is highly flammable. For instance, when repairing motorcycles, extra caution is required when removing the fuel tank due to residual gasoline—even tightening screws could generate sparks that ignite the vapor. In summer, the white vapor seen at gas station nozzles is gasoline vapor; this is why using mobile phones is strictly prohibited—to prevent electrical sparks. The high ignition temperature means gasoline can only be ignited by spark plugs in engine combustion chambers. Under normal ambient temperatures, it won't self-ignite, which is somewhat reassuring. However, proper storage is still crucial—avoid leaving it on balconies exposed to sunlight.

[OVictoria]

A veteran mechanic once taught me that the flash point of gasoline is around -43°C, while the ignition point is above 280°C. The low flash point makes gasoline extremely hazardous due to its high volatility. Like last time when cleaning fuel injectors, I forgot to turn off the work light, and the heat from the bulb ignited gasoline vapors, causing flames to shoot higher than a person. The high ignition point actually saved us—if it were lower, the engine compartment would have self-ignited long ago. Now I always use metal cans for storing gasoline, as plastic bottles can accumulate static electricity, which could cause an explosion when opening the lid. Also, always check the thermometer when refueling—the hotter the weather, the more caution is needed.