Just a reminder these safes are not actually fireproof. They are fire resistant and people should check what they are rated for before buying.
this post was submitted on 24 Mar 2026
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the fire will die as there will be no oxygen in the safe.
Just put an oxygen tank in it too, easy!
You won't even have to worry about fire then!
Well if the safe is airtight then the fire will stop as soon as the safe is closed because there needs to be oxygen for fire to spread
There are other oxidizing agents that xan maintain fire.
If you fill a safe with rocket fuel and ignite it, the safe is not guaranteed to contain the result.
It's my rocket fuel, and it was either the safe or the toilet, alright
Like petrol?
I know nothing about safes, let alone fireproof safes, but I'd guess that pressure may be an issue, if not a lack of oxygen for the fire to burn through.
What are you lighting on fire? Why are you burning it? What's the problem you're trying to solve?
What you want, if it needs refractory-cement or whatever the insulation in the was of fire-safes is, is called a Forge or an Incinerator, maybe a Kiln or a Heat-soak Furnace, and no, an off-the-shelf Fire-safe is far from sufficient without abusrdist-levels of modification.
The heat needs somewhere to go, and those safes, the plastic home-and-office-grade ones anyways, are designed to take external pressure, not hold it in. In-fact, part of why they work is that the oxygen get's sucked-out by the fire outside -they generally aren't air-tight, save maybe the "flood-safe" ones ... which I still would be surprised to see protect anything versus prolonged submersion.
Even if you used an electric heating-element and seal the gap you need for that perfectly, you're going to out-gas the plastics and insulation, destroying the integrity of the safe and contaminating the area with toxic fumes, long before the contents are singed-enough to cause much damage without additional oxygen. Once you've got an open flame, your electric heating-element is fucked, so while you could maybe BS a fire-safe to suit your purpose, its one-time-use and closing/locking it is working against you every step of the way.
If it has to be cheap/free, and low-technical-difficulty, there's Primitivist channels on youtube that will show you how to make a forge from clay and/or clay-brick and mud.
I guess if heat-alone would do what you want, a dutch-oven over an open fire could do, or a charcoal-chimney-starter if the items are small-enough. For PID-document destruction, I use a fire-pit, or rather, I use bills and reciepts to light kindling, but I usually have enough of both that you could almost call the wood in the pit an after-thought.
Probably yeah. A fireproof safe will be airtight, so the system can only produce as much energy as whatever reagents you put inside.
If you put some slow burning rocket fuel in there, and it begins to ignites one day. The inside of the safe will probably melt, smoke will ruin your entire house, but it shouldn’t burn down the whole thing.
Actually, this brings up an interesting alternate use for an old safe like that. If your old fireproof safe is broken, or you lost the key or whatever, you could turn it into a fireplace of sorts. Just flip it the door side up, throw in some logs and a place a large pan on top. May look a bit ghetto style, but who cares as long as the wok veggies and meat taste good.
Ok, that’s a good point and something appreciated insight.
Notice that a battery fire will produce it's own oxygen.
That really depends on the safe but for the most part it should be. It would probably ruin the safe as the inside is probably not fire resistant but also the fire would probably choke out as the safe should be airtight. As for signal penetration, again depends on the safe but I believe that most safes have some layer of thick metal, which should block all signals.
Additionally, in general, what digital signals (if any, reliably) are able to penetrate a locked safe?
For hard-drive and chip-storage destruction, its hard to beat a drill or a hydraulic press. Holes, or snapping the storage-medium in half will generally do. From there to recyclers or landfill, either is less toxic to the environment than burning the stuff in a PC or phone.
I assume you mean radio frequencies, and the answer is basically none. A grounded fireproof safe is basically a perfect faraday cage.
EDIT: Ok, I actually have a pedantic answer for this. If you put a microphone on a device inside the safe, you can signal it from outside by sending it vibrations, and you could encode a message in binary and thus technically send it a "digital signal". If you wanted to be a little more analog you could use Morse code :)
Yes. Ok well that complicates things, but I suppose a piece of string small enough may be able to dangle out of the closed door and maybe be slightly moved…
Note, @disorderly@lemmy.world is referring to metal-safes, not the plastic file-safe crap you'll find in Walmart.