# THIONYL CHLORIDE — NFPA 704 fire diamond ratings by chemical

For THIONYL CHLORIDE, cas number is 7719-09-7; health (blue) is 4; flammability (red) is 0; instability (yellow) is 2; special (white) is W, verified against its source on 2026-08-06.

- **Chemical:** THIONYL CHLORIDE _(verified: appears in the quote below)_
- **CAS number:** 7719-09-7 _(verified: appears in the quote below)_
- **Health (blue):** 4 _(verified: appears in the quote below)_
- **Flammability (red):** 0 _(verified: appears in the quote below)_
- **Instability (yellow):** 2 _(verified: appears in the quote below)_
- **Special (white):** W _(verified: appears in the quote below)_
- **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. _(verified: appears in the quote below)_

## What the source says

> 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.

## Source

- https://cameochemicals.noaa.gov/chemical/1600

Last verified: 2026-08-06. Review by: 2028-08-05.
Part of [NFPA 704 fire diamond ratings by chemical](https://referencesource.org/nfpa-704-hazard-ratings/).