Category:Articles with unknown NFPA 704 code

Category should be empty.

Unknown NFPA 704 codes used. Articles are sorted by H, F, I, or S depending on the unknown code.

When there are multiple unknown codes, the article will be sorted under any one letter. So a page with an erroneous "F=7" code may be under "I" when that has an error too (like "I=5" or "R=5"). All error articles are in this category -- somewhere. Populated by NFPA 704 diamond (see its documentation). Note that code "S" (Special) is used, not "O" (Other).

[ H] Health, blue

[ F] Flammability, red

[ I] Instability (reactivity), yellow

[ S] Special hazards, white