cas_number string | chemical string | flammability string | hazard_description string | health string | id string | instability string | source string | source_quote string | url string | verified_fields list | special string |
|---|---|---|---|---|---|---|---|---|---|---|---|
7664-41-7 | AMMONIA, ANHYDROUS | 1 | Health | 3 | Can cause serious or permanent injury. | Flammability | 1 | Must be preheated before ignition can occur. | Instability | 0 | Normally stable, even under fire conditions. | Special | | | Note: The Refrigeration System Classification section of the International Mechanical Code requires a value of 3 for the ... | 3 | ammonia-anhydrous | 0 | https://cameochemicals.noaa.gov/chemical/4860 | Health | 3 | Can cause serious or permanent injury. | Flammability | 1 | Must be preheated before ignition can occur. | Instability | 0 | Normally stable, even under fire conditions. | Special | | | Note: The Refrigeration System Classification section of the International Mechanical Code requires a value of 3 for the ... | https://referencesource.org/nfpa-704-hazard-ratings/ammonia-anhydrous/ | [
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57608-40-9 | AMMONIUM NITRATE-PHOSPHATE MIXTURE | 0 | Health | 0 | No hazard beyond that of ordinary combustible material. | Flammability | 0 | Will not burn under typical fire conditions. | Instability | 3 | Capable of detonation or explosive decomposition or explosive reaction but requires a strong initiating source or must be heated under confinement before initiation.... | 0 | ammonium-nitrate-phosphate-mixture | 3 | https://cameochemicals.noaa.gov/chemical/100 | Health | 0 | No hazard beyond that of ordinary combustible material. | Flammability | 0 | Will not burn under typical fire conditions. | Instability | 3 | Capable of detonation or explosive decomposition or explosive reaction but requires a strong initiating source or must be heated under confinement before initiation.... | https://referencesource.org/nfpa-704-hazard-ratings/ammonium-nitrate-phosphate-mixture/ | [
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75-19-4 | CYCLOPROPANE | 4 | Health | 1 | Can cause significant irritation. | Flammability | 4 | Burns readily. Rapidly or completely vaporizes at atmospheric pressure and normal ambient temperature. | Instability | 0 | Normally stable, even under fire conditions. | Special | | | | 1 | cyclopropane | 0 | https://cameochemicals.noaa.gov/chemical/500 | Health | 1 | Can cause significant irritation. | Flammability | 4 | Burns readily. Rapidly or completely vaporizes at atmospheric pressure and normal ambient temperature. | Instability | 0 | Normally stable, even under fire conditions. | Special | | | | https://referencesource.org/nfpa-704-hazard-ratings/cyclopropane/ | [
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7719-09-7 | THIONYL CHLORIDE | 0 | Health | 4 | Can be lethal. | Flammability | 0 | Will not burn under typical fire conditions. | Instability | 2 | Readily undergoes violent chemical changes at elevated temperatures and pressures. | Special | W Reacts violently or explosively with water. | 4 | thionyl-chloride | 2 | https://cameochemicals.noaa.gov/chemical/1600 | Health | 4 | Can be lethal. | Flammability | 0 | Will not burn under typical fire conditions. | Instability | 2 | Readily undergoes violent chemical changes at elevated temperatures and pressures. | Special | W Reacts violently or explosively with water. | https://referencesource.org/nfpa-704-hazard-ratings/thionyl-chloride/ | [
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NFPA 704 fire diamond ratings by chemical
Canonical, always-current version: https://referencesource.org/nfpa-704-hazard-ratings/ Machine-readable: https://referencesource.org/nfpa-704-hazard-ratings/data.json — this mirror is a point-in-time copy.
- Last verified: 2026-08-06
- Stale after: 2028-08-05 (past this date, prefer the canonical copy — it re-verifies on a cadence this snapshot does not)
- Records: 4
The NFPA 704 'fire diamond' rating for a chemical — the health (blue), flammability (red), instability (yellow) numbers and any special (white) notice — as published on that chemical's own datasheet. Each record is one chemical, with the four quadrants and the datasheet's own wording for what each value means. Answers 'what is the NFPA 704 rating for anhydrous ammonia', 'fire diamond numbers for thionyl chloride', and 'what does a 3 in the blue diamond mean'. NFPA 704 itself is a paywalled standard and the per-chemical ratings are scattered one page at a time across datasheets and SDSs, so no single free table exists — assembly, one source per record.
Provenance — what every record carries
Every record carries source (the URL the value was read from) and
source_quote (a verbatim quote from that page stating it). A value you
cannot check against its page is indistinguishable from an invented one;
these can all be checked. Each record is also individually addressable on
the canonical site at its url.
Licence position
CAMEO Chemicals is published by NOAA, a US Government agency; its datasheets are US Government works and not copyrightable. The ratings themselves are safety classifications, i.e. facts. The NFPA 704 standard document is not reproduced and must not be — only the per-chemical rating and the datasheet's own short attributed wording.
Facts are not copyrightable; what this dataset takes from each source is a fact plus a short attributed quote linking back to the page that states it.
Sources
- https://cameochemicals.noaa.gov/chemical/4860
- https://cameochemicals.noaa.gov/chemical/100
- https://cameochemicals.noaa.gov/chemical/500
- https://cameochemicals.noaa.gov/chemical/1600
Fields
See any record in data/records.jsonl — field names are self-describing,
and the canonical page for each record renders them with labels:
https://referencesource.org/nfpa-704-hazard-ratings/
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