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OLEUM
ICSC: 1447
Peer-Review Status: 10.10.2002 Validated
Sulfuric acid, fuming
Disulphuric acid
Dithionic acid
Pyrosulfuric acid
Mixture of sulfuric acid and sulfur trioxide 
CAS #: 8014-95-7 RTECS #: WS5605000
UN #: 1831
EC #: 016-019-00-2
    Formula: H2SO4.O3S
Molecular mass: see Notes

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Not combustible. Many reactions may cause fire or explosion. Gives off irritating or toxic fumes (or gases) in a fire.  NO contact with flammables. NO contact with bases, combustible substances, reducing agents or water.  NO hydrous agents. NO water. In case of fire in the surroundings, use appropriate extinguishing media. 
EXPLOSION Risk of fire and explosion on contact with bases, combustible substances, reducing agents or water.    In case of fire: keep drums, etc., cool by spraying with water. NO direct contact of the substance with water. 
 
EXPOSURE   PREVENT GENERATION OF MISTS! AVOID ALL CONTACT!  IN ALL CASES CONSULT A DOCTOR! 
Inhalation Burning sensation. Cough. Laboured breathing. Shortness of breath. Sore throat. Symptoms may be delayed. See Notes.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. 
Skin Redness. Serious skin burns. Pain. Blisters.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain. Blurred vision. Severe deep burns.  Wear face shield or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal pain. Burning sensation. Nausea. Vomiting. Shock or collapse.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Personal protection: chemical protection suit including self-contained breathing apparatus. NEVER direct water jet on liquid. Do NOT absorb in saw-dust or other combustible absorbents. Collect leaking and spilled liquid in covered plastic containers as far as possible. Absorb remaining liquid in dry sand or inert absorbent. Then store and dispose of according to local regulations. Do NOT let this chemical enter the environment.  Unbreakable packaging.
Put breakable packaging into closed unbreakable container.
Airtight.
Do not transport with food and feedstuffs. 
EC Classification
Symbol: C; R: 14-35-37; S: (1/2)-26-30-45; Note: B 
UN Classification
UN Hazard Class: 8; UN Subsidiary Risks: 6.1; UN Pack Group: I 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-80S1831.
NFPA Code: H3; F0; R2; W. 
Separated from food and feedstuffs and incompatible materials. See Chemical Dangers. Dry. Cool. Ventilation along the floor. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS-TO-BROWN FUMING VISCOUS OILY HYGROSCOPIC LIQUID WITH CHARACTERISTIC ODOUR. 

Physical dangers
The vapour is heavier than air. 

Chemical dangers
Decomposes on heating. This produces toxic and corrosive fumes including sulfur oxides. The substance is a strong oxidant. It reacts violently with combustible and reducing materials and organic compounds. This generates fire and explosion hazard. Reacts violently with water and moist air. This produces sulfuric acid. The solution in water is a strong acid. It reacts violently with bases and is corrosive to metals. This produces flammable/explosive gas (hydrogen - see ICSC 0001). 

Occupational exposure limits
TLV not established. 

Routes of exposure
The substance can be absorbed into the body by inhalation. 

Inhalation risk
A harmful contamination of the air will be reached quickly on evaporation of this substance at 20°C. 

Effects of short-term exposure
The substance is corrosive to the eyes, skin and respiratory tract. Corrosive on ingestion. Inhalation may cause lung oedema. See Notes. 

Effects of long-term or repeated exposure
Repeated or prolonged inhalation of the aerosol may cause effects on the lungs. Repeated or prolonged inhalation of the aerosol may cause effects on the teeth. This may result in tooth erosion. Strong inorganic acid mists containing this substance are carcinogenic to humans. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: see Notes
Melting point: see Notes
Relative density (water = 1): 1.9
Solubility in water: miscible, reaction
Vapour pressure: see Notes
Relative vapour density (air = 1): 3-3.3
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.01-1.3 
The substance is harmful to aquatic organisms. 

NOTES
The amount of free sulfur trioxide may vary, which can change the physical properties, and therefore no figure for the molecular weight is given.
Boiling points of solutions (% SO_3): 138°C (20% ), 116°C (30%), 60°C (65%).
Melting points (% SO_3): 2°C (20%), 21°C (30%), 5°C (65%).
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort.
Rest and medical observation is therefore essential.
Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered.
NEVER pour water into this substance; when dissolving or diluting always add it slowly to the water.
See ICSC 0362 Sulfuric acid and ICSC 1202 Sulfur trioxide. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations