Foam, also froth

An aerated solution that is used for fire prevention and fire-fighting. Foam is an efficient agent for extinguishing most liquid petroleum fires. Foams are divided into low, medium and high ranges of expansion.

- Low-expansion foam  – Expansion in volume of up to 20 times of the quantity of water used.

- Medium-expansion foam  – Expansion 20-200 times.

- High-expansion foam  – Expansion 200-1000 times.

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