What materials fall under WHMIS class D?

WHMIS class D encompasses materials that pose various hazards related to their toxicological properties. Specifically, "Poisonous and Infectious Material" falls under this category because it includes substances that can cause illness or death upon exposure or ingestion. This classification addresses both the acute and chronic effects of chemical exposure, emphasizing the need for careful handling to avoid any harmful incidents.

Understanding that these materials can be highly dangerous is crucial for ensuring proper safety protocols are followed, as they may affect human health or the environment significantly. The importance of this classification is highlighted in regulatory frameworks that mandate appropriate labeling, training, and emergency procedures for those who may come into contact with such hazardous substances. Other classifications, while important, pertain to different types of risks; for instance, corrosive materials relate to skin and eye damage, and biohazardous infectious material involves pathogens. However, it is the poisonous and infectious materials that specifically address the dual risk of toxicity and biological threat, making it a critical area of focus in occupational health and safety regulations.