What is HD 1.1 fire symbol?

The HD 1.1 fire symbol indicates a hazardous material that is highly explosive, presenting a significant risk of detonation under specific conditions. This classification is part of the Department of Transportation's (DOT) Hazardous Materials Regulations, which categorize materials based on their potential hazards. Substances labeled with this symbol require stringent handling and storage protocols to ensure safety. It is crucial for personnel to be trained in recognizing and responding to such hazards.