H2O7S2
178.15 g/mol
Industrial ChemicalDanger
OLEUM
CAS8014-95-7EC616-954-1
Category
Industrial Chemical
Compound Class
Other
Primary Use
Sulfonating and dehydrating agent
Oleum is a solution of sulfur trioxide in 100% sulfuric acid, used primarily as a sulfonating and dehydrating agent in industrial chemical synthesis.
Sulfonating agent for surfactants and dyesDehydrating agent in nitration reactions for explosivesDrying agent for chlorine and nitric acid
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.
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Related Compounds
StrongSame Parent
Sulfuric acid—(¹⁵N₂)hydrazine (1/1)
CAS88491-70-7
research compound
StrongSame Parent
Hydrazine sulfate
CAS10034-93-2
Chemical intermediate and reagent
StrongSame Parent
Sulfuric acid
CAS7664-93-9
Fertilizer, petroleum refining, battery production
ReferenceSame Category
Sodium lignosulfonate
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dispersant, binder, chelating agent
ReferenceSame Category
Bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite
CAS80693-00-1
antioxidant for polymers
ReferenceSame Category
1,3-dichloro-2-(dichloromethyl)benzene
CAS81-19-6
Industrial intermediate for organic synthesis
ReferenceSame Category
2-nitro-m-xylene
CAS81-20-9
intermediate for dyes and agrochemicals
Safety Reference
Danger
H314Causes severe skin burns and eye damage
H318Causes serious eye damage
H330Fatal if inhaled
H335May cause respiratory irritation
H331Toxic if inhaled
H350May cause cancer
H371May cause damage to organs
H373May cause damage to organs through prolonged or repeated exposure
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for OLEUM (CAS 8014-95-7) is 2807.00.
HS code (international, 6-digit)
2807.00
EU CN code (8-digit)
2807 00 00
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
sulfuric acid;sulfur trioxide
InChIKey
HIFJUMGIHIZEPX-UHFFFAOYSA-N
SMILES
OS(=O)(=O)O.O=S(=O)=O
Synonyms (25)
- OLEUM
- Fuming sulfuric acid
- Oleum (Fuming Sulfuric acid)
- Oleum iodisum
- SULFUR TRIOXIDE, MIXT. CONTG.
- Sulfuric acid fuming
- Sulfuric acid, fuming, 26-29%
- sulfuric acid;sulfur trioxide
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