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OLEUMICSC: 1447
Sulfuric acid, fuming
Disulphuric acid
Dithionic acid
Pyrosulfuric acid
Mixture of sulfuric acid and sulfur trioxide
November 2016
CAS #: 8014-95-7
UN #: 1831

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Not combustible. Many reactions may cause fire or explosion. Gives off irritating or toxic fumes (or gases) in a fire.  Risk of fire and explosion on contact with bases, combustible substances, reducing agents, water or organic materials.  NO contact with incompatible substances. See Chemical Dangers.  NO contact with incompatible materials: See Chemical Dangers  NO water. In case of fire in the surroundings, use appropriate extinguishing media.  In case of fire: keep drums, etc., cool by spraying with water. NO direct contact of the substance with water. 

 PREVENT GENERATION OF MISTS! AVOID ALL CONTACT! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough. Sore throat. Burning sensation. Shortness of breath. Laboured breathing.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer immediately for medical attention. 
Skin Redness. Pain. Blisters. Serious skin burns.  Protective gloves. Protective clothing. Apron.  Wear protective gloves when administering first aid. First rinse with plenty of water for at least 15 minutes, then remove contaminated clothes and rinse again. Refer immediately for medical attention. 
Eyes Redness. Pain. Blurred vision. Severe burns.  Wear face shield or eye protection in combination with breathing protection.  Rinse with plenty of water for several minutes (remove contact lenses if easily possible). Refer immediately for medical attention. 
Ingestion Burns in mouth and throat. Burning sensation behind the breastbone. Abdominal pain. Vomiting. Shock or collapse.  Do not eat, drink, or smoke during work.  Rinse mouth. Give nothing to drink. Do NOT induce vomiting. Refer immediately for medical attention. 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Evacuate danger area! Consult an expert! Personal protection: chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Do NOT absorb in saw-dust or other combustible absorbents. Collect leaking liquid in sealable containers. Absorb remaining liquid in dry sand or inert absorbent. Then store and dispose of according to local regulations. Cautiously neutralize remainder with lime or soda ash. 

According to UN GHS Criteria

skull;toxiccorr
DANGER
Fatal if inhaled
Causes severe skin burns and eye damage
May cause respiratory irritation
May be corrosive to metals
See Notes 

Transportation
UN Classification
UN Hazard Class: 8; UN Subsidiary Risks: 6.1; UN Pack Group: I 

STORAGE
Dry. Separated from food and feedstuffs and incompatible materials. See Chemical Dangers. Store only in original packaging. Ventilation along the floor. 
PACKAGING
Unbreakable packaging.
Put breakable packaging into closed unbreakable container.
Airtight.
Do not transport with food and feedstuffs. 
OLEUM ICSC: 1447
PHYSICAL & CHEMICAL INFORMATION

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 gases including sulfur oxides. The substance is a strong oxidant. It reacts with combustible and reducing materials and organic materials. This generates fire and explosion hazard. 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). Reacts violently with water and moist air. This produces sulfuric acid. See Notes. Attacks some plastics. 

Formula: H2SO4.O3S
Molecular mass: see Notes
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 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
Serious local effects by all routes of exposure. The substance can be absorbed into the body by inhalation of its aerosol. 

Effects of short-term exposure
The substance is very corrosive to the eyes, skin and respiratory tract. Corrosive on ingestion. Exposure could cause asphyxiation due to swelling in the throat. Inhalation of high concentrations may cause lung oedema, but only after initial corrosive effects on the eyes and the upper respiratory tract have become manifest. Inhalation may cause asthma-like reactions (RADS). Medical observation is indicated. See Notes. 

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

Effects of long-term or repeated exposure
Repeated or prolonged contact with skin may cause dermatitis. Repeated or prolonged inhalation of the aerosol may cause effects on the lungs. Risk of tooth erosion upon repeated or prolongated exposure to an aerosol of this substance. Mists of this strong inorganic acid are carcinogenic to humans. See Notes. 


OCCUPATIONAL EXPOSURE LIMITS
 

ENVIRONMENT
The substance is harmful to aquatic organisms. 

NOTES
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 are therefore essential.
IARC considers mists of strong inorganic acid to be carcinogenic (group 1). However there is no information available on the carcinogenicity of other physical forms of this substance. Therefore no classification for carcinogenicity under GHS has been applied.
NEVER pour water into this substance; when dissolving or diluting always add it slowly to the water.
The amount of free sulfur trioxide may vary, which can change the physical properties, and therefore no figure for the molecular weight is given.
Reported vapour pressure values differ greatly (from 0.3 to 21.9 kPa).
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%).
See ICSCs 0362 and 1202. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: C; R: 14-35-37; S: (1/2)-26-30-45; Note: B 

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    See Also:
       Toxicological Abbreviations