Sulfur trioxide
Also known as: EINECS 231-197-3, MFCD00011452, Oxosulfane dioxide, SO3, SULFAN(R), SULFUR TRIOXIDE, SULFUR TRIOXIDE, 99%, PACKAGED IN AMPULES, STABILIZED, SULFURIC ANHYDRIDE, SULPHUR TRIOXIDE, Schwefeltrioxid, Sulfan, Sulfur oxide (SO3), Sulfur(VI) trioxide, Sulfuric oxide, sulfur trioxide, sulfur(VI) oxide, sulfuric acid anhydride
Sulfur trioxide (CAS 7446-11-9) is a compound in the Inorganic Chemicals category listed in the Jingsj chemical database. It has the molecular formula O3S and a molecular weight of 80.06320 g/mol. Key properties include a melting point of 16.8 °C(lit.), a boiling point of 44.8 °C and a density of 1.97 g/mL at 25 °C(lit.). It is classified under GHS with signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 7446-11-9
- Jingsj CID
- J-46665-9
- Molecular Formula
- O3S
- Molecular Weight
- 80.06320 g/mol
- Category
- Inorganic Chemicals
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 16.8 °C(lit.) |
|---|---|
| Boiling Point | 44.8 °C |
| Density | 1.97 g/mL at 25 °C(lit.) |
| Exact Mass | 79.95680 |
| PSA | 83.30000 |
| LogP | 0.29180 |
| Additional Property | 2.8 (vs air) |
| Vapor Pressure | 280 mm Hg ( 25 °C) |
| Additional Property | reacts violently |
GHS Safety & Compliance
- H314 — Causes severe skin burns and eye damage
- H335 — May cause respiratory irritation
Frequently Asked Questions
What is the CAS number of Sulfur trioxide?
The CAS number of Sulfur trioxide is 7446-11-9.
What are the molecular formula and molecular weight of Sulfur trioxide?
Sulfur trioxide has molecular formula O3S and molecular weight 80.06320 g/mol.
Is Sulfur trioxide hazardous?
Sulfur trioxide has GHS signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage; H335 — May cause respiratory irritation.
What are the upstream and downstream products of Sulfur trioxide?
For Sulfur trioxide, Upstream Products: SULFUR DIOXIDE, Methanol, Selenium oxychloride; Downstream Products: Formaldehyde, Ammonia, ch3cho.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Sulfur trioxide (CAS 7446-11-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-46665-9 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.