When a safe is in a house fire, it acts like a huge convection oven – the fire outside the safe heats up the air inside the safe which, by convection, transfers heat to the firearms and valuables stored in the safe. How quickly your valuables become damaged by the fire depends on three things – the temperature inside the safe, the burning or melting point of the various materials that make up your valuables, and the specific heat capacity of those materials. Specific heat capacity is the amount of heat required to change the temperature of one kilogram of a substance by one degree. In other words, the higher a material's specific heat capacity, the more heat energy is required to raise the temperature of that material. Specific heat capacity is extremely important when taking into consideration the fire-rating of a safe. The paper document used in a typical fire-testing procedure has a specific heat capacity of 1.4 (Kcal/Kg °C) and an ignition point of 451°F. By comparison, aluminum, steel, gold and silver have much lower specific heat capacities of 0.91, 0.49, 0.13 and 0.23 respectively. This means that the steel barrel of your rifle or aluminum casing of your scope will heat up a lot more quickly and easily than any paper document in the safe. With an ABS plastic gun stock melting at 221°F and wood solids starting to break down at around 575°F, you can image how quickly a gun can become ruined under heat conditions that would cause little, if any damage to a paper document in the same safe. If companies began fire-testing their safes using guns and other valuables as the standard, rather than documents, they would find that conventional fireproofing does little to prevent the safe's contents from being quickly destroyed by a typical house fire.