What type of material must be used for labeling hazardous substances?

Waterproof labels are essential for labeling hazardous substances because they provide durability and resistance to various environmental factors, including moisture, chemicals, and abrasion. In situations where hazardous materials are handled or stored, it is crucial that the labels remain intact and legible over time, as they communicate important safety information, such as warnings, handling instructions, and disposal guidelines.

Using a label that can withstand contact with spills, humidity, or exposure to the elements ensures that the information remains visible and accurate, which is vital for the safety of personnel and compliance with regulatory standards. This requirement significantly reduces the risk of accidents related to the mishandling of hazardous materials.