How many hazard classes are established by hazmat regulations?

Hazmat regulations categorize hazardous materials into a total of nine hazard classes. This classification system helps ensure that hazardous materials are managed and transported safely by providing clear guidance on the classification of different substances.

While the choice of four may reflect common categories within certain contexts, such as general safety or industry-specific guidelines, it does not encompass the full range established by hazmat regulations. Each of the nine classes addresses specific types of hazards, including explosives, gases, flammable liquids, and more, facilitating appropriate handling and emergency responses. Understanding the complete list of hazard classes is essential for compliance and safety in the transportation and handling of hazardous materials.