I would say there are better emergency tinder materials out there. Esbit tablets or waterproof flares for example. Those shavings can get wet and murphy's law has a habit of proving itself at the worst possible time.
I agree with sideways. Not trying to minimize your preparedness effort, but I have several different natural and man made tinders in my fire kit.
I also carry waterproof matches, a Bic lighter or 3, a mag bar, and a ferro rod.
