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PLASTER OF PARISICSC: 1217
Gypsum hemihydrateOctober 2004
CAS #: 26499-65-0

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

   
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough.  Use local exhaust or breathing protection.  Fresh air, rest. 
Skin   Protective gloves.  Rinse and then wash skin with water and soap. 
Eyes Redness. Pain.  Wear safety spectacles.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion   Do not eat, drink, or smoke during work.  Rinse mouth. 

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

According to UN GHS Criteria

 

Transportation
UN Classification
 

STORAGE
Dry. Well closed. 
PACKAGING
 
PLASTER OF PARIS ICSC: 1217
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
FINE HYGROSCOPIC WHITE POWDER. 

Physical dangers
 

Chemical dangers
 

Formula: (CaSO4)2.H2O
Molecular mass: 290.3
Melting point: 163°C
Density (for the alpha hemihydrate): 2.76 g/cm³
Density (for the beta hemihydrate): 2.63 g/cm³
Solubility in water, g/100ml at 25°C: 0.30  


EXPOSURE & HEALTH EFFECTS

Routes of exposure
 

Effects of short-term exposure
May cause mechanical irritation. 

Inhalation risk
A nuisance-causing concentration of airborne particles can be reached quickly when dispersed, especially if powdered. 

Effects of long-term or repeated exposure
 


OCCUPATIONAL EXPOSURE LIMITS
 

ENVIRONMENT
 

NOTES
Other CAS number is 10034-76-1.
The apparent melting point caused by loss of crystal water is given.
Melting point for the anhydrous form is 1450°C. 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations