O3S
80.07 g/mol
Industrial ChemicalDanger
SULFUR TRIOXIDE
CAS7446-11-9EC231-197-3
Category
Industrial Chemical
Compound Class
Other
Primary Use
Sulfonation agent and sulfuric acid intermediate
Sulfur trioxide is a chemical compound with the formula SO3, produced industrially on a vast scale as a precursor to sulfuric acid and sulfonate-based surfactants. It is the most economically important sulfur oxide and is used primarily as a sulfonation agent.
production of sulfuric acid via the Contact processmanufacture of sulfonate-based surfactants
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Sourcing SULFUR TRIOXIDE?
Post a free purchase request — no account needed. It reaches suppliers of this product, and replies go straight to your inbox.
Related Compounds
ReferenceSame Category
Zinc sulfate monohydrate
CAS7446-19-7
Electroplating and industrial processing
ReferenceSame Category
Zinc sulfate heptahydrate
CAS7446-20-0
zinc supplement and industrial chemical
ReferenceSame Category
Aluminum chloride
CAS7446-70-0
Catalyst and chemical intermediate
ReferenceSame Category
Lithium chloride
CAS7447-41-8
Desiccant and humectant
Safety Reference
Danger
H314Causes severe skin burns and eye damage
H318Causes serious eye damage
H330Fatal if inhaled
H335May cause respiratory irritation
H351Suspected of causing cancer
H411Toxic to aquatic life with long lasting effects
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for SULFUR TRIOXIDE (CAS 7446-11-9) is 2811.29.
HS code (international, 6-digit)
2811.29
EU CN code (8-digit)
2811 29 10
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
sulfur trioxide
InChIKey
AKEJUJNQAAGONA-UHFFFAOYSA-N
SMILES
O=S(=O)=O
Synonyms (12)
- NISSO SULFAN
- SULFUR TRIOXIDE
- Sulfan
- Sulfite radical anion
- Sulfur oxide (SO3)
- Sulfur trioxide, stabilized
- Sulfuric anhydride
- Sulfuric oxide
- Sulphur trioxide
- Trioxo-lambda~6~-sulfane
- [SO3]
Sourcing SULFUR TRIOXIDE?
Post a free purchase request — no account needed. It reaches suppliers of this product, and replies go straight to your inbox.