What WHMIS Class symbol features a skull?

The WHMIS Class symbol that features a skull is associated with D1 Class, which indicates immediate and serious toxic effects. This symbol is used to warn individuals of materials that can cause severe health effects or even be life-threatening upon exposure. The skull graphic serves as a stark visual cue to emphasize the lethality of such substances, reminding workers to handle them with extreme caution and to adhere to necessary safety protocols.

In contrast, the other classes focus on different types of hazards. D2 Class, for example, refers to substances that have other toxic effects that might not be immediately lethal but can still cause harm, such as chronic health issues. D3 Class deals with biohazardous infectious materials, which are biologically dangerous but do not necessarily carry the same immediate toxicity implications as indicated by the skull symbol. C1 Class covers corrosive materials, which can cause damage to living tissue or materials but are not characterized by the immediate deadly effects represented by the skull icon. Understanding these distinctions is essential for proper hazard recognition and safety in the workplace.