| Fire resistance is usually measured by the number of minutes a safe or cabinet has been tested to protect its contents when exposed to fire. The longer the period in minutes, the greater the fire resistance offered. |
This rating is normally obtained by measuring the internal temperature of the safe whilst being exposed to temperatures around 1,000 C in a furnace. The critical temperature before paper records char or combust is about 177 C. Computer media cabinets, however, are tested to maintain internal temperatures below approximately 52 C - which is the maximum temperature most media manufacturers recommend.