Fire Safes are usually made of a thin metal double wall and have a fire-resistant insulating material between the walls. They have a minimum level of security, because they are designed to protect (especially papers) against fire. They have to maintain an internal temperature of below 200 degrees C (the point at which documents will be destroyed) .The safes provide the fire protection for either 30, 60, 90 or 120 minutes. Similar to them, but a bit more effective, there are the Data Fire Safes which maintain less than 52 degrees C (the point at which data media is destroyed) and also protect against high humidity, electro magnetic contamination, etc