HazMat Tool — substance information
Reference only — not a shipping paper, placard mandate, or CVI record.
Carbonyl sulfide
HMT 15 June 2026- UN / ID
- UN 2204
- Hazard class
- 2.3
- Packing group
- —
- ERG guide
- ERG 119
- Special provisions
- SP 3, SP B14
- Source
- 49 CFR §172 (15 June 2026)
Carbonyl sulfide
Carbonyl sulfide is the chemical compound with the linear formula O=C=S. It is a colorless flammable gas with an unpleasant odor. It is a linear molecule consisting of a carbonyl double bonded to a sulfur atom. Carbonyl sulfide can be considered to be intermediate between carbon dioxide and carbon disulfide, both of which are valence isoelectronic with it Wikipedia
Substance Data
Source: PubChem (HSDB, 21.10.2026)CAS-Number463-58-1 |
Flash Point— | Boiling Point-50 ° C |
| Emergency Response Guide No. 119 |
Hazardous Materials Table
Source: 49 CFR §172 (15 June 2026)(3) Hazard class2.3Poisonous gas |
(4) Identification number |
(5) Packing Group |
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(6) Labels |
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(7) Special Provisions (§172.102)
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| 3 | |
|---|---|
| B14 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 304 | see 49 CFR §173.304 |
| (8C) Bulk | 314, 315 | see 49 CFR §173.314, 315 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | Forbidden |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
Segregation chart for load, transport, and storage
This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.
Hinweis: In der Kompatibilitätstabelle sind Stoffe der Gefahrenklasse 2.3 abhängig der Einstufung der inhalativen Giftigkeit zu berücksichtigen (Gefahrenzone A). Siehe Sonderbestimmung 1 sowie PHMSA Interpretation #09-0252.
| Hazard class | 8![]() | 7![]() | 6.1![]() | 5.2![]() | 5.1![]() | 4.3![]() | 4.2![]() | 4.1![]() | 3![]() | 2.3B![]() | 2.3A![]() | 2.2![]() | 2.1![]() | 1.6![]() | 1.5![]() | 1.4![]() | 1.3![]() | 1.1/1.2![]() |
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3 ![]() | ||||||||||||||||||
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7 ![]() | ||||||||||||||||||
8 ![]() |
| Must not be loaded, transported, or stored together in the same vehicle or facility. | |
| May be loaded, transported, or stored together. | |
| May be loaded, transported, or stored together only with restrictions. |
Similar substances
| UN / ID | Proper shipping name | Hazard class |
|---|---|---|
| UN 3281 | Metal carbonyls, liquid, n.o.s. | 6.1 |
| UN 3466 | Metal carbonyls, solid, n.o.s. | 6.1 |
| UN 1994 | Iron pentacarbonyl | 6.1 |
| tert-Butoxycarbonyl azide | Forbidden | |
| UN 2417 | Carbonyl fluoride | 2.3 |
| UN 1259 | Nickel carbonyl | 6.1 |
| Potassium carbonyl | Forbidden |