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POTASSIUM METABISULFITEICSC: 1175
October 1995
CAS #: 16731-55-8Potassium pyrosulfite
Dipotassium disulfite
EINECS #: 240-795-3

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Combustible under specific conditions. See Notes.    NO open flames.    In case of fire in the surroundings, use appropriate extinguishing media.   

 PREVENT DISPERSION OF DUST! STRICT HYGIENE!  
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Shortness of breath. Wheezing.  Use local exhaust or breathing protection.  Fresh air, rest. Artificial respiration may be needed. 
Skin   Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. 
Eyes   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 Diarrhoea. Headache. Vomiting. Weakness.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Give one or two glasses of water to drink. Rest. 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water. Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. 

According to UN GHS Criteria

 

Transportation
UN Classification
 

STORAGE
Dry. Well closed. Keep in a well-ventilated room. 
PACKAGING
 
POTASSIUM METABISULFITE ICSC: 1175
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
WHITE CRYSTALLINE POWDER WITH PUNGENT ODOUR. 

Physical dangers
 

Chemical dangers
Decomposes on heating and on burning. This produces toxic and irritating fumes including sulfur oxides. Reacts with acids. This produces toxic and irritating sulfur dioxide. 

Formula: K2S2O5
Molecular mass: 222.3
Decomposes at 190°C
Relative density (water = 1): 2.34
Solubility in water: good 


EXPOSURE & HEALTH EFFECTS

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

Effects of short-term exposure
Inhalation may cause asthma-like reactions. 

Inhalation risk
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed. 

Effects of long-term or repeated exposure
Repeated or prolonged contact may cause skin sensitization. Repeated or prolonged inhalation may cause asthma. 


Occupational exposure limits
 

ENVIRONMENT
 

NOTES
The compound may catch fire if much heat develops in powdering it.
The symptoms of asthma 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.
Anyone who has shown symptoms of asthma due to this substance should avoid all further contact with this substance. 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations
       Potassium metabisulfite (FAO Nutrition Meetings Report Series 40abc)
       POTASSIUM METABISULFITE (JECFA Evaluation)