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CALCIUM HYDROXIDEICSC: 0408 (September 1997)
Calcium dihydroxide
Calcium hydrate
Hydrated lime
Slaked lime
CAS #: 1305-62-0
EC Number: 215-137-3

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Not combustible.        In case of fire in the surroundings, use appropriate extinguishing media.   

 PREVENT DISPERSION OF DUST!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation Sore throat. Cough. Burning sensation.  Use local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness. Roughness. Pain. Dry skin. Skin burns. Blisters.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain. Severe deep burns.  Wear safety goggles, 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 Burning sensation. Abdominal pain. Abdominal cramps. Vomiting.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Give nothing to drink. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered containers. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

 

Transportation
UN Classification
 

STORAGE
Separated from strong acids. 
PACKAGING
 
CALCIUM HYDROXIDE ICSC: 0408
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS CRYSTALS OR WHITE POWDER. 

Physical dangers
 

Chemical dangers
Decomposes on heating. This produces calcium oxide. The solution in water is a medium strong base. Reacts violently with acids. Attacks many metals in the presence of water. This produces flammable/explosive gas (hydrogen - see ICSC 0001). 

Formula: Ca(OH)2
Molecular mass: 74.1
Decomposes at 580°C
Relative density (water = 1): 2.2
Solubility in water: none 


EXPOSURE & HEALTH EFFECTS

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

Effects of short-term exposure
The substance is corrosive to the eyes and skin. The substance is irritating to the respiratory tract. Medical observation is indicated. 

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 with skin may cause dermatitis. Repeated or prolonged inhalation of dust particles may cause effects on the lungs. 


OCCUPATIONAL EXPOSURE LIMITS
TLV: 5 mg/m3, as TWA.
MAK: (inhalable fraction): 1 mg/m3; peak limitation category: I(2); pregnancy risk group: C.
EU-OEL: (respirable fraction): 1 mg/m3 as TWA; (respirable fraction): 4 mg/m3 as STEL 

ENVIRONMENT
 

NOTES
 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations
       CALCIUM HYDROXIDE (JECFA Evaluation)