Waterproof surface: a perk?

[Ulzgoroth]

Originally Posted by Bruno

Is that the one that oxidizes steel, glass, sand, and test engineers? Barely sits in aluminum containers because it forms some sort of aluminum fluorine oxygen compound but good help you if you scratch or dent it?

Along those lines, yes, though not exactly that. As far as I can tell it's not aluminum you want, but the only safe containment is certain metals that form a fluorinated surface layer. And if that layer is damaged the container may burn through anyway. Also on the list of things it can combust: asbestos.