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1. Mostly made of recycled wood filler.
2. The fire blocking added to the sheet to make it unique is only .015 to .005 thick.
3. Designed to block fires from room to room, not to insulate an item that easily condenses.
4. Not much different then sheetrock / gypsum/ fire board liners when used as an insulator.
5. Must be stored in dry areas, not areas prone to condensation like safes.

Another spin off of sheetrock some safe companies have been using is PyroBlock, which is not much different from sheetrock /gypsum/ fire boards panels. It performs better than your average panels on the market as a fire barrier, but it just was not designed to be an insulator. The following statement came straight from the PyroBlock web page, before they made changes: "Because Pyroblock is a post-treated product, the panel thickness is slightly greater than the thickness of raw panels. In general, the thickness tolerance of Pyroblock will range from .015 to .005 over the nominal thickness of the panel." This means, the added part that makes Pyroblock more fire resistant than most sheetrock /gypsum/ fire boards , is only .015" to .005" thick. This is comparable to the thickness of extremely thin 28 gauge steel. Over the phone, they told how this addition is only added to one side of the panel, unless one paid a lot more to get it layered on both sides of the panel. Like sheetrock, Pyroblock is designed for homes to block the rapid advancement of flames, not to insulate. Another interesting fact they say about PyroBlock is the following, "On average, the moisture content of Pyroblock panels should be around 6-8%, however, under very humid conditions, the moisture level can temporarily increase." Excessive moisture conditions should be avoided as warnings are given about how it must be stored in dry areas and avoid moisture. Condensation is a common factor in safes, so PyroBlock won't be a good candidate for a fire safe insulator. You might wonder how it is that sheetrock / pyro block / fire board filled safes can get any kind of decent fire rating (that is if the safe company didn't just make up the fire rating), but to understand that you first understand the fire test itself and we have that available for you listed here.