What is the most effective agent to put out a beryllium fire?

The most effective agent for extinguishing a beryllium fire is dry chemical. Beryllium is a metal that can ignite and burn at high temperatures, and it poses unique challenges in fire suppression.

Dry chemical agents, particularly those designed for metal fires, are specifically formulated to interrupt the fire's chemical reactions. These agents work by coating the burning metal and preventing air from reaching it, which is essential because metals like beryllium can react with water and other common extinguishing agents, potentially leading to explosive reactions or worsening the fire.

While other options like Halon and foam may be effective for different types of fires, they are not suitable for beryllium. Water, even when used in fog form, can react with the burning metal, making it unsafe and potentially exacerbating the situation. Portanto, for extinguishing fires involving beryllium, dry chemical agents are the most appropriate choice due to their ability to safely suppress these specific fires.