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POTASSIUM HYDROXIDE
ICSC: 0357
Peer-Review Status: 04.05.2010 Validated
Caustic potash
Potassium hydrate
Potassium lye 
CAS #: 1310-58-3 RTECS #: TT2100000
UN #: 1813
EC #: 019-002-00-8
EINECS #: 215-181-3
    Formula: KOH
Molecular mass: 56.1

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Not combustible. Contact with moisture or water may generate sufficient heat to ignite combustible materials.  NO contact with water.  In case of fire in the surroundings, use appropriate extinguishing media. 
EXPLOSION Risk of fire and explosion on contact with: See Chemical Dangers.  NO contact with incompatible materials: See Chemical Dangers   
 
EXPOSURE   PREVENT DISPERSION OF DUST! AVOID ALL CONTACT!  IN ALL CASES CONSULT A DOCTOR! 
Inhalation Cough. Sore throat. Burning sensation. Shortness of breath.  Use local exhaust or breathing protection.  Fresh air, rest. Refer immediately for medical attention. 
Skin Redness. Pain. Serious skin burns. Blisters.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower for at least 15 minutes. Refer immediately for medical attention. 
Eyes Redness. Pain. Blurred vision. Severe 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 Abdominal pain. Burns in mouth and throat. Burning sensation in the throat and chest. Nausea. Vomiting. Shock or collapse.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. If within a few minutes after ingestion, one small glass of water may be given to drink. Refer immediately for medical attention. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Sweep spilled substance into covered plastic containers. Carefully collect remainder. Then store and dispose of according to local regulations.  Do not transport with food and feedstuffs. 
EC Classification
Symbol: C; R: 22-35; S: (1/2)-26-36/37/39-45 
UN Classification
UN Hazard Class: 8; UN Pack Group: II 
GHS Classification
Signal: Danger
Harmful if swallowed
Causes severe skin burns and eye damage
May cause respiratory irritation 
correxcl mark;warn

EMERGENCY RESPONSE SAFE STORAGE
NFPA Code: H3; F0; R1.  Separated from food and feedstuffs, strong acids and metals. Store only in original container. Dry. Well closed. Store in an area without drain or sewer access. 

IMPORTANT DATA
Physical State; Appearance
WHITE HYGROSCOPIC SOLID IN VARIOUS FORMS. 

Physical dangers
No data. 

Chemical dangers
The solution in water is a strong base. It reacts violently with acid and is corrosive to metals such as aluminium, tin, lead and zinc. This produces a combustible/explosive gas (hydrogen - see ICSC 0001). Reacts with ammonium salts. This produces ammonia. This generates fire hazard. Contact with moisture and water may generate heat. See Notes. 

Occupational exposure limits
TLV: 2mg/m³ (ceiling value); (ACGIH 2010).
MAK (not established):.
EU OEL:. 

Routes of exposure
Serious local effects by all routes of exposure. 

Inhalation risk
A harmful concentration of airborne particles can be reached quickly when dispersed. 

Effects of short-term exposure
The substance is very corrosive to the eyes, skin and respiratory tract. Corrosive on ingestion. 

Effects of long-term or repeated exposure
Repeated or prolonged contact with skin may cause dermatitis. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 1324°C
Melting point: 380°C
Density: 2.04 g/cm³
Solubility in water, g/100ml at 25°C: 110 (very good) 
This substance may be hazardous to the environment. Special attention should be given to aquatic organisms. 

NOTES
The applicable occupational exposure limit value should not be exceeded during any part of the working exposure.
NEVER pour water into this substance; when dissolving or diluting always add it slowly to the water.
Other UN number: UN1814 Potassium hydroxide solution, hazard class 8, packing group II-III. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations
       POTASSIUM HYDROXIDE (JECFA Evaluation)
       Potassium hydroxide (SIDS)