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CALCIUM HYDROXIDE ICSC: 0408
Date of peer-review: April 1997

Calcium dihydroxide
Calcium hydrate
Hydrated lime
Slaked lime
CAS # 1305-62-0 Ca(OH)2
RTECS # EW2800000 Molecular mass: 74.1
UN #
EC #
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Not combustible.

In case of fire in the surroundings: all extinguishing agents allowed.
EXPLOSION


EXPOSURE
PREVENT DISPERSION OF DUST!

Inhalation Sore throat. Cough. Burning sensation.
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.
Safety goggles, or 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 take to a doctor.
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 PACKAGING & LABELLING
Sweep spilled substance into containers, then remove to safe place. (Extra personal protection: P2 filter respirator for harmful particles).
EU Classification
UN Classification

EMERGENCY RESPONSE STORAGE

Separated from strong acids.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2001

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CALCIUM HYDROXIDE ICSC: 0408
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS CRYSTALS OR WHITE POWDER.

CHEMICAL DANGERS:
The substance decomposes on heating producing calcium oxide. The solution in water is a medium strong base. Reacts violently with acids. Attacks many metals in presence of water forming flammable/explosive gas (hydrogen - see ICSC # 0001.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 5 mg/m^3 (ACGIH 1996).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol and by ingestion.

INHALATION RISK:
Evaporation at 20C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates the respiratory tract and is corrosive to the eyes and the skin. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged contact with skin may cause dermatitis. Lungs may be affected by repeated or prolonged exposure to dust particles.
PHYSICAL PROPERTIES
Melting point (decomposes): 580C
Relative density (water = 1): 2.2
Solubility in water: none
ENVIRONMENTAL DATA

NOTES

ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2001

See Also:
        Calcium hydroxide (CHEMINFO)
        Calcium hydroxide (PIM 138)