Which WHMIS Class symbol features only a flame?

The symbol that features only a flame corresponds to materials that are classified under combustibles or flammable substances. This classification falls under Class B, which includes combustible and flammable materials. The presence of just the flame symbol is a visual cue indicating that the material poses a fire hazard, highlighting its potential for combustion under certain conditions, such as exposure to heat or open flames.

The other classes each have distinct symbols that represent different hazards. Class A, for instance, is identified by a cylinder symbol, indicating compressed gas, whereas Class C uses an exploding bomb symbol to represent oxidizing materials. Class D represents various levels of toxicity and infectious materials, and its symbol might include symbols indicating chronic hazards or skull and crossbones for acute toxicity. The uniqueness of the flame symbol in Class B makes it easy to distinguish from the other classes, clearly indicating the fire risk associated with combustible materials.