Overall, kind of a neat idea, but I think you are doing too much with it. It eats flesh, it makes people mutilate themselves, IT MAKES EVERYTHING SHARP.
Pick one or two and go with those. I think the sharp thing is a really cool idea, but the other stuff going on kind of smothers it.
Either way, seems well written, keep working on it and it could become a viable SCP.
Also, you should probably include something about personnel interacting with it wearing respirators at all times. It only makes sense. Also, I would specify the exact dimensions of the box, instead of just the volume. m3 just looks bad. 5 m x 5 m x 5 m is more visually appealing.
Um yeah, thats what comes to mind immediately, I may come back later and do a more full critique. As I said, its a neat idea, try to hash it out more and you may have a successful SCP.