[quote=ironraven] The seal is water proof, and as close to gas tight as I can make it, so any oxygen will get used up fast)

Gas tight may not help.
Chemistry is not my strong suit, but, as I understand it, the reason match heads (and gunpowder) work in pipe bombs (and gun chambers) is that they don't rely on atmospheric oxygen, they generate their own oxygen by breaking down potassium chlorate or potassium nitrate. The likelihood of ignition is small to be sure; but if it does ignite, the combination of matches and butane will probably make a big boom. Butane lighters apparently explode, but are pretty well-engineered, or we would be constantly surrounded by human torches-and that is probably true of match safes, too.



reference: http://nobel.scas.bcit.ca/resource/glossary/s-z.htm

http://www.chemaxx.com/butane_lighter3.htm
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