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Is there any substance that's a 0-0-0 on the NFPA diamond? Basically a perfectly safe chemical.

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Water!

Water MSDS

You can find plenty of others if you perform this search on Wikipedia (but then, go check the MSDS for the individual compounds before doing anything serious with them).

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  • $\begingroup$ Wow, that was really obvious. I feel dumb. $\endgroup$ – lurf jurv Dec 2 '13 at 4:43
  • $\begingroup$ I think this does not hold for all "types" of water. Imagine what pure water could to the the osmotic pressure in your cells. I don't know for sure, but I wouldn't drink a liter of distilled/deionized water. $\endgroup$ – Jori Aug 24 '14 at 22:46
  • $\begingroup$ A liter in your stomach would probably be ok, a liter in your lungs would cause trouble. $\endgroup$ – user137 Aug 24 '14 at 23:00
  • $\begingroup$ Any source on that? $\endgroup$ – Jori Aug 24 '14 at 23:01

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