What is a significant risk associated with Class 3 flammable liquids?

Class 3 flammable liquids are primarily characterized by their ability to ignite easily and burn rapidly, which poses a significant risk when they are near potential ignition sources. Their flash points are generally below 60 degrees Celsius (140 degrees Fahrenheit), meaning they can readily vaporize and produce flammable vapors at normal temperatures. This characteristic makes them particularly dangerous in situations where heat, sparks, or open flames can initiate a fire. Therefore, the significant risk associated with these liquids is their high combustibility, which can lead to fires or explosions, especially in environments where they may be inadvertently exposed to ignition sources.

The other options, while they describe certain hazards, do not specifically capture the primary risk associated with Class 3 flammable liquids as effectively as the correct choice does. Corrosion of metal containers is more relevant to other classes of hazardous materials, while the release of toxic fumes typically pertains to certain burning materials or specific chemical classes rather than flammable liquids in general. The weight of the liquids, whether they float or sink, varies by substance and isn’t a defining risk associated with the combustibility of Class 3 materials.