1. Some safe companies realize how expensive this insulator is and wont line the whole safe with the material, yet lead you to believe they do. If a manufacturer states they use ceramic, be sure to ask them how much of it you're getting, and where they are placing it. Sometimes they just give .5 to 1 inch of ceramic in combination with cheap sheetrock and call it good. Sturdy Safe knows this isn't good enough because we tested this method out in actual house burn downs.
2. Not compressing ceramic enough can make it loose and fall within the safe. Safes that claim to have "air gaps" or "cooling gaps" (which basically means; an air break with nothing there) will have this problem. These companies hang the ceramic on hooks, which have little support. It is important to mention, that over compression of any insulation material will cause the loss of insulating value. Sturdy understands this so we don't over compress, and we know just the right amount of compression required to prevent shake down of the material and still provide superior insulating value. The right amount of compression also makes it to where the shake down of gravity will have no effect on the position of the insulating material between the inner and outer wall. For instance, when a safe bounces all the way to the east cost in the back of a truck, that material better stay put. If the insulation is movable it's usually because they hang the ceramic on several tiny posts like nails, this may work for gravity, but truck travel will cause shake down, leaving air gaps at the top of the safe. Proper application of insulation is as important as the liner it's self.