I've searched on a lot of websites if elemental mercury (Hg) has an NFPA classification but I can't find any.
Does mercury have an NFPA classification?
According to Sigma-Aldrich
GHS06: Acute toxicity (oral, dermal, inhalation), categories 1,2,3
GHS08: Respiratory sensitization, category 1; Germ cell mutagenicity, categories 1A,1B,2; Carcinogenicity, categories 1A,1B,2; Reproductive toxicity, categories 1A,1B,2; Specific Target Organ Toxicity – Single exposure, categories 1,2; Specific Target Organ Toxicity – Repeated exposure, categories 1,2; Aspiration Hazard, category 1
GHS09: Hazardous to the aquatic environment; Acute hazard, category1; Chronic hazard, categories 1,2
And according to ScienceLab:
I believe the ScienceLab information is the 'NFPA 704 classification'.
An email exchange between NIST and myself asking for clarifiation:
My Email (Pre-filled form on the website, I don't have the original):
Something along the lines of "Hello, I see NIST and a few other manufactures of have different NFPA classifications (I provided links to the SDS's), could you explain the difference between your ratings and theirs?"
Good afternoon, Our NFPA rating Health = 2 Fire = 0 Reactivity = 0 matches other manufacturers. You can check Aldrich website for 99.99 Mercury http://www.sigmaaldrich.com/catalog/product/sigald/215457?lang=en®ion=US Thank you, Office of Reference Materials
Other manufacturers (Note, plural) apparently now equals 1 example
according the Federal Final Rule of hazard Communication Mercury has a NFPA rating of 0 because it does not burn.