Thiirane
Also known as: Ethylene sulfide, Dimethylene sulfide, Thiacyclopropane, Epithioethane
Thiirane (CAS 420-12-2) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C2H4S and a molecular weight of 60.118 g/mol. Key properties include a melting point of 207-209ºC, a boiling point of 55.5±0.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 10.0±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H301 — Toxic if swallowed and H331 — Toxic if inhaled. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 420-12-2
- Jingsj CID
- J-36365-3
- Molecular Formula
- C2H4S
- Molecular Weight
- 60.118 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 207-209ºC |
|---|---|
| Boiling Point | 55.5±0.0 °C at 760 mmHg |
| Density | 1.1±0.1 g/cm3 |
| Flash Point | 10.0±0.0 °C |
| Exact Mass | 60.003368 |
| PSA | 25.30000 |
| LogP | 0.21 |
| Vapor Pressure | 248.4±0.1 mmHg at 25°C |
| Refractive Index | 1.574 |
| Storage Conditions | Freezer |
| Stability | Stable at room temperature, but may have butylmercaptan added to enhance stability. Flammable. |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H301 — Toxic if swallowed
- H331 — Toxic if inhaled
- H318 — Causes serious eye damage
Frequently Asked Questions
What is the CAS number of Thiirane?
The CAS number of Thiirane is 420-12-2.
What are the molecular formula and molecular weight of Thiirane?
Thiirane has molecular formula C2H4S and molecular weight 60.118 g/mol.
Is Thiirane hazardous?
Thiirane has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H301 — Toxic if swallowed; H331 — Toxic if inhaled.
What are the upstream and downstream products of Thiirane?
For Thiirane, Upstream Products: 1,2-Dibromoethane, 2-Mercaptoethanol, Trifluoroacetic anhydride; Downstream Products: Captamine, Bis(2-mercaptoethyl) sulfide, 1,2-Ethanedithiol.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Thiirane (CAS 420-12-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-36365-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.