Quick Answer
When steel wool gets moist, it can become a fire hazard due to a process called spontaneous combustion, which occurs when the steel wool's iron content reacts with oxygen in the presence of moisture. This reaction can produce heat and eventually ignite the steel wool, potentially causing a fire.
Spontaneous Combustion Process
Spontaneous combustion occurs when steel wool’s iron content reacts with oxygen in the presence of moisture. This reaction is accelerated by the presence of iron oxide, which can be present in the steel wool even if it appears clean. When steel wool gets moist, the moisture can penetrate the fibers and react with the iron oxide, producing heat and initiating the combustion process.
Factors Influencing Spontaneous Combustion
Several factors influence the likelihood of spontaneous combustion in steel wool, including the presence of moisture, temperature, and the amount of iron content in the steel wool. Generally, steel wool with a higher iron content is more prone to spontaneous combustion. In addition, temperatures above 100°F (38°C) can accelerate the reaction. If steel wool is exposed to these conditions, it can ignite spontaneously.
Safety Precautions
To prevent fires caused by spontaneous combustion, it’s essential to store steel wool in a dry, well-ventilated area, away from heat sources. When handling steel wool, avoid exposing it to moisture, as this can increase the risk of spontaneous combustion. If you’re planning to use steel wool for a fire, such as in a fire battery, ensure that it’s completely dry and free of moisture before use.
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