O2S
64.07 g/mol
Industrial ChemicalDanger
Sulfur dioxide
CAS7446-09-5EC231-195-2
Category
Industrial Chemical
Compound Class
n.a
Primary Use
Industrial chemical for smelting and refining
Sulfur dioxide is a colorless gas with a pungent odor, naturally released by volcanic activity and produced as a by-product of metals refining and the burning of sulfur-bearing hydrocarbon fuels. It is primarily used as an industrial chemical for smelting and refining processes.
Industrial chemical for smelting and refiningBy-product in metals refining
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.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:California Proposition 65
CAS 7446-09-5
Related Compounds
ReferenceSame Category
Sulfur trioxide
CAS7446-11-9
Sulfonation agent and sulfuric acid intermediate
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
Safety Reference
Danger
H314Causes severe skin burns and eye damage
H331Toxic if inhaled
H370Causes damage to organs
H280Contains gas under pressure; may explode if heated
H319Causes serious eye irritation
H372Causes damage to organs through prolonged or repeated exposure
H318Causes serious eye damage
Customs Tariff Classification
The international HS code for Sulfur dioxide (CAS 7446-09-5) is 2811.29.
HS code (international, 6-digit)
2811.29
EU CN code (8-digit)
2811 29 05
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 dioxide
InChIKey
RAHZWNYVWXNFOC-UHFFFAOYSA-N
SMILES
O=S=O
Synonyms (41)
- E-220
- R-764
- Anhydride, Sulfurous
- Dioxide, Sulfur
- Dioxo-lambda~4~-sulfane
- FEMA 3039
- Fermenicide liquid
- Fermenicide powder
- Fermenticide liquid
- INS NO.220
- Oxosulfane oxide
- SULFUR DIOXIDE (E 220)
- SULFUR DIOXIDE [MART.]
- SULFUROUS ANHYDRIDE (E220)
- Schwefel(IV)-oxid
- Schwefeldioxid
- Schwefeldioxyd
- Schwefeldioxyd [German]
- Siarki dwutlenek
- Siarki dwutlenek [Polish]
- Sulfur dioxide (NF)
- Sulfur dioxide (SO2)
- Sulfur oxide (SO2)
- Sulfur superoxide
- Sulfurous acid anhydride
- Sulfurous anhydride
- Sulfurous oxide
- Surfur dioxide (anhydrous)
- [SO2]
- dioxidosulfur
- sulfer dioxide
- sulfonyl
- sulfur dioxide
- sulfuryl
- sulphonyl
- sulphur dioxide