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PERCHLORIC ACID (72% SOLUTION)ICSC: 1006
April 2000
CAS #: 7601-90-3Hydronium perchlorate
UN #: 1873
EINECS #: 231-512-4

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Not combustible but enhances combustion of other substances. 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 metals, reducing agents or organic materials.  NO contact with combustible substances or reducing agents.  Do NOT expose to friction or shock.  In case of fire in the surroundings: water in large amounts, water spray.  In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position. 

 PREVENT GENERATION OF MISTS! AVOID ALL CONTACT! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Sore throat. Burning sensation. Cough. Laboured breathing. Symptoms may be delayed. See Notes.  Use ventilation, local exhaust or breathing protection. Use appropriate engineering controls.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. See Notes. 
Skin Redness. Pain. Serious skin burns.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain. Loss of 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 Sore throat. Abdominal pain. Burning sensation. Diarrhoea. Shock or collapse. Vomiting.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Evacuate danger area! Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Do NOT absorb in saw-dust or other combustible absorbents. Absorb liquid in sand or inert absorbent. Then store and dispose of according to local regulations. Cautiously neutralize remainder. Do NOT wash away into sewer. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 5.1; UN Subsidiary Risks: 8; UN Pack Group: I 

STORAGE
Fireproof. See Chemical Dangers. Well closed. 
PACKAGING
Special material.
Unbreakable packaging.
Put breakable packaging into closed unbreakable container. 
PERCHLORIC ACID (72% SOLUTION) ICSC: 1006
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS LIQUID WITH PUNGENT ODOUR. 

Physical dangers
No data. 

Chemical dangers
May explode on heating. Decomposes on heating. This produces toxic and corrosive fumes. The substance is a strong oxidant. It reacts violently with combustible and reducing materials, organic materials and strong bases. This generates fire and explosion hazard. Attacks many metals. This produces flammable/explosive gas (hydrogen - see ICSC 0001). The acid is unstable if the concentration is over 72%; may explode by shock or concussion when dry or drying. Mixtures with combustible material (such as paper) may ignite spontaneously at room temperature. 

Formula: ClHO4
Molecular mass: 100.46
Decomposes at 19°C
Melting point: -112°C
Relative density (water = 1): 1.76 (22°C)
Solubility in water: miscible
Relative vapour density (air = 1): 3.5  


EXPOSURE & HEALTH EFFECTS

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

Effects of short-term exposure
Corrosive. The vapour is very corrosive to the eyes, skin and respiratory tract. Inhalation of the vapour or mist may cause lung oedema. See Notes. The effects may be delayed. Medical observation is indicated. 

Inhalation risk
No indication can be given about the rate at which a harmful concentration of this substance in the air is reached on evaporation at 20°C. 

Effects of long-term or repeated exposure
 


Occupational exposure limits
 

ENVIRONMENT
The substance is harmful to aquatic organisms. 

NOTES
DO NOT use perchloric acid in a hood designed for other purposes.
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.
Immediate administration of an appropriate inhalation therapy by a doctor, or by an authorized person, should be considered.
Rinse contaminated clothing with plenty of water because of fire hazard.
NEVER pour water into this substance; when dissolving or diluting always add it slowly to the water. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: O, C; R: 5-8-35; S: (1/2)-23-26-36-45 

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       Toxicological Abbreviations