When you came to our regional, we had a bucket of sand at the rostrum incase of a LiPo disaster...... we didn't have any bullet proof vests for NiMH's though. The reason sand is used, is that the Lithium combusts when in contact with oxygen, hence the flame, the sand removes the oxygen to extinguish the flame. The Lithium still leaks out, but instead of hitting oxygen in a jet of gas, it weeps through the sand.
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