Class 4: Flammable Solids, Self-Heating Substances, and Substances That Become Flammable Upon Contact with Moisture

Class 4: Flammable Solids, Self-Heating Substances, and Substances That Become Flammable Upon Contact with Moisture

Substances such as sulfur fall into this category. During transport, explosion-proof containers must be used, and the state of charge (SOC) must be carefully controlled to ensure transportation safety.