Category:Articles with unknown NFPA 704 code

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Administrators: Please do not delete this category as empty! This category may be empty occasionally or even most of the time.

See NFPA 704. Pages are sorted by F, H, R, or O 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 "R" when that has an error too (like "R=5"). All error articles are in this category -- somewhere.

This category is filled by {{Chembox}}, subtemplate {{NFPA-chembox}} (see documentation).