Fire protection
Virtually all gunsafes provide some level of fire protection, by the mere fact that they are steel boxes. Increased fire protection is generally facilitated by adding one or more layers of fire resistant sheetrock that act as an insulator and a heat sink. There are a wide variety of fire linings, such as using layers of ceramic or mineral wool blankets, or a combination of ceramic blanket and sheetrock or concrete with vermiculite. Ceramic blankets provide great insulation but absolutely no heat absorption. While they may sound very high-tech, they do not necessarily guarantee the best fire protection and are definitely more expensive.
The safe's door design can make a big difference in its fire protective capabilities. Generally speaking, composite door designs tend to offer better fire protection than plate door designs. Plate doors, although generally offering superior security, tend to transfer heat faster than formed “composite doors”.
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