The safe is slightly below the slab so they enjoy a certain amount of protection from fire even without an actual fire rating. Their main weakness is that water might get down into the safe. Many of these units have rim that sticks above the floor several inches and that eliminates a lot of the danger from minor flooding.
If the fire dept fights the fire in your house, you can count on a certain of water flooding in any case, but it may be easier to put the contents into a waterproof [and thermal resistant?]container of some sort into the safe, rahter than to make the safe itself waterproof.
Jeff
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