WHMIS (Workplace Hazardous Materials Information Sheet) is, as the name implies, a system to categorize all the known hazardous materials a worker could encounter in the workplace. Its contents are law and must be complied with. It will outline the hazards and what PPE to use to avoid risk of injury or illness. It includes the SDS (MSDS) a form that each chemical must have that shows its characteristics and hazards and more appropriately, how to deal with them in a safe manner. This is one of the most important modules in this course and should be referred to in the case of any questions arising about any particular chemical.