What hazard class does a flame symbol represent?

The flame symbol represents flammable materials and self-heating substances because it specifically indicates hazards associated with fire. When you see this symbol on a label or safety data sheet (SDS), it communicates that the substance can easily ignite and burn, posing a risk of fire or explosion under certain conditions.

Flammable materials are those substances that can catch fire when exposed to a source of ignition, while self-heating substances can spontaneously ignite when exposed to air or under specific temperature conditions. This categorization helps ensure that individuals handling these materials are aware of the risks involved and can take appropriate safety measures to prevent fire hazards.

In contrast, the other options address different types of hazards. Corrosive substances cause damage to living tissues or materials; oxidizers can enhance the combustion of other materials; and explosive materials are those that can undergo a rapid chemical reaction, potentially resulting in an explosion. Each of these categories has its own specific symbols and risk factors, which are distinct from the dangers represented by the flame symbol.