{"asset": "nfpa-704-hazard-ratings", "asset_type": "classification", "body": "The NFPA 704 'fire diamond' rating for a chemical \u2014 the health (blue), flammability (red), instability (yellow) numbers and any special (white) notice \u2014 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 \u2014 assembly, one source per record.\n", "description": "The NFPA 704 'fire diamond' rating for a chemical \u2014 the health (blue), flammability (red), instability (yellow) numbers and any special (white) notice \u2014 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 \u2014 assembly, one source per record.", "file": "index.md", "generated": true, "harvested": "2026-08-06", "key_field": "chemical", "licence": "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 \u2014 only the per-chemical rating and the datasheet's own short attributed wording.", "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"], "stale_after": "2028-08-05", "title": "NFPA 704 fire diamond ratings by chemical", "type": "dataset", "verified": false}
{"asset": "nfpa-704-hazard-ratings", "body": "**Chemical:** AMMONIA, ANHYDROUS\n\n**CAS number:** 7664-41-7\n\n**Health (blue):** 3\n\n**Flammability (red):** 1\n\n**Instability (yellow):** 0\n\n**What the rating means:** 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 red quadrant (flammability hazard) for indoor ammonia refrigeration equipment.\n\n> 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 red quadrant (flammability hazard) for indoor ammonia refrigeration equipment.\n\nSource: <https://cameochemicals.noaa.gov/chemical/4860>\n", "cas_number": "7664-41-7", "chemical": "AMMONIA, ANHYDROUS", "file": "ammonia-anhydrous.md", "flammability": "1", "generated": true, "harvested": "2026-08-06", "hazard_description": "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 red quadrant (flammability hazard) for indoor ammonia refrigeration equipment.", "health": "3", "id": "ammonia-anhydrous", "instability": "0", "source_quote": "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 red quadrant (flammability hazard) for indoor ammonia refrigeration equipment.", "sources": ["https://cameochemicals.noaa.gov/chemical/4860"], "stale_after": "2028-08-05", "title": "AMMONIA, ANHYDROUS \u2014 NFPA 704 fire diamond ratings by chemical", "type": "classification", "verified": true}
{"asset": "nfpa-704-hazard-ratings", "body": "**Chemical:** AMMONIUM NITRATE-PHOSPHATE MIXTURE\n\n**CAS number:** 57608-40-9\n\n**Health (blue):** 0\n\n**Flammability (red):** 0\n\n**Instability (yellow):** 3\n\n**Special (white):** OX\n\n**What the rating means:** 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. | Special | OX | Possesses oxidizing properties. | Note: NFPA ratings shown are for ammonium nitrate, CAS number 6484-52-2.\n\n> 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. | Special | OX | Possesses oxidizing properties. | Note: NFPA ratings shown are for ammonium nitrate, CAS number 6484-52-2.\n\nSource: <https://cameochemicals.noaa.gov/chemical/100>\n", "cas_number": "57608-40-9", "chemical": "AMMONIUM NITRATE-PHOSPHATE MIXTURE", "file": "ammonium-nitrate-phosphate-mixture.md", "flammability": "0", "generated": true, "harvested": "2026-08-06", "hazard_description": "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. | Special | OX | Possesses oxidizing properties. | Note: NFPA ratings shown are for ammonium nitrate, CAS number 6484-52-2.", "health": "0", "id": "ammonium-nitrate-phosphate-mixture", "instability": "3", "source_quote": "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. | Special | OX | Possesses oxidizing properties. | Note: NFPA ratings shown are for ammonium nitrate, CAS number 6484-52-2.", "sources": ["https://cameochemicals.noaa.gov/chemical/100"], "special": "OX", "stale_after": "2028-08-05", "title": "AMMONIUM NITRATE-PHOSPHATE MIXTURE \u2014 NFPA 704 fire diamond ratings by chemical", "type": "classification", "verified": true}
{"asset": "nfpa-704-hazard-ratings", "body": "**Chemical:** CYCLOPROPANE\n\n**CAS number:** 75-19-4\n\n**Health (blue):** 1\n\n**Flammability (red):** 4\n\n**Instability (yellow):** 0\n\n**What the rating means:** 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 | | |\n\n> 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 | | |\n\nSource: <https://cameochemicals.noaa.gov/chemical/500>\n", "cas_number": "75-19-4", "chemical": "CYCLOPROPANE", "file": "cyclopropane.md", "flammability": "4", "generated": true, "harvested": "2026-08-06", "hazard_description": "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 | | |", "health": "1", "id": "cyclopropane", "instability": "0", "source_quote": "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 | | |", "sources": ["https://cameochemicals.noaa.gov/chemical/500"], "stale_after": "2028-08-05", "title": "CYCLOPROPANE \u2014 NFPA 704 fire diamond ratings by chemical", "type": "classification", "verified": true}
{"asset": "nfpa-704-hazard-ratings", "body": "**Chemical:** THIONYL CHLORIDE\n\n**CAS number:** 7719-09-7\n\n**Health (blue):** 4\n\n**Flammability (red):** 0\n\n**Instability (yellow):** 2\n\n**Special (white):** W\n\n**What the rating means:** 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.\n\n> 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.\n\nSource: <https://cameochemicals.noaa.gov/chemical/1600>\n", "cas_number": "7719-09-7", "chemical": "THIONYL CHLORIDE", "file": "thionyl-chloride.md", "flammability": "0", "generated": true, "harvested": "2026-08-06", "hazard_description": "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.", "health": "4", "id": "thionyl-chloride", "instability": "2", "source_quote": "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.", "sources": ["https://cameochemicals.noaa.gov/chemical/1600"], "special": "W", "stale_after": "2028-08-05", "title": "THIONYL CHLORIDE \u2014 NFPA 704 fire diamond ratings by chemical", "type": "classification", "verified": true}