Which hazard is indicated by a green DOD label?

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When you see a green DoD hazard label, it signals that the material is reactive with water. This matters because adding water to such a substance can trigger a chemical reaction, which may release heat, gases, or even cause an explosion. So, the safe approach is to keep moisture away, store it in dry conditions, and avoid using water to extinguish a fire involving it. Use non-water extinguishing agents like dry chemical powders or carbon dioxide if a fire occurs, and follow procedures that minimize moisture exposure.

Other hazards would be indicated by different colors and require different handling. For example, a label signaling a highly pressurized gas would call for containment and pressure precautions; a corrosive label would demand materials handling and eyewash provisions; a label for water-based solvents would imply different solvent-specific precautions.