Fireproof cabinets and safes designed for storing documents have double metal walls, between which ash is poured.

Fireproof cabinets and safes designed for storing documents have double metal walls, between which ash is poured. Why are the securities stored in such a safe often remain intact even when the safe is removed from the fire?

The space between the double metal walls covered with ash has poor thermal conductivity. Therefore, the papers do not heat up even during a fire.

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