Through a little 'net research I've learned that there are different ratings for fire-proof safes. The Underwriters Laboratory classifies fireproof safes according to how hot the interior of the safe gets when exposed to fire over certain amounts of time.

The Classification typically reads: "Class X, Y-hour" where X is the maximum temperature the interior of the safe is guaranteed to reach when exposed to high temperatures (typically 1700F - 2000F) for Y hours. For example...

Class 350 1-hour safes are certified that the interior of the safe will not exceed 350 degrees Farenheit over 1 hour. Class 125 4-hour safes are certified not to exceed 125 degrees Farenheit over 4 hours.

So now all we need to know is...

A) at what temperature to chips melt/warp (Do we need a Class 350 or Class 125 safe?)
B) How long does your average house fire expose your safe to temperatures in the 1700 degree Farenheit range? (Do we need a 1, 2, 3, or 4 hour safe?)

Thoughts?