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I was reading an MSDS sheet on bleach. There is a section named NFPA. Under that is are the words,

Health Hazard: 3, Flammability:0, Stability:0

Does that mean that Bleach is highly unstable?

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    $\begingroup$ Do not confuse GHS (5-1) and NFPA 704 (0-4) placards. $\endgroup$ – A.K. Jan 19 '17 at 0:31
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According to the Wikipedia site for the NFPA 704 identification system, a Stability rating of 0 means:

Normally stable, even under fire exposure conditions, and is not reactive with water.

The low concentration of the bleach, in other words it's mostly water, is the reason that it fits the "0" category.

Note that the bleaching component of the bleach solution is sodium hypochlorite (see your MSDS for bleach). Pure solid sodium hypochlorite has a NFPA reactivity rating of "1".

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