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MALEIC ACID
ICSC: 1186
Peer-Review Status: 10.10.1997 Validated
(Z)-Butenedioic acid
cis-1,2-Ethylenedicarboxylic acid
Malenic acid 
CAS #: 110-16-7 RTECS #: OM9625000
UN #: 1759
EC #: 607-095-00-3
EINECS #: 203-742-5
    Formula: C4H4O4 / HOOCCH=CHCOOH
Molecular mass: 116.1

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Combustible. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames.  Use water spray, powder, foam, carbon dioxide. 
EXPLOSION      
 
EXPOSURE   PREVENT DISPERSION OF DUST! STRICT HYGIENE!   
Inhalation Cough. Laboured breathing.  Use local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Refer for medical attention. 
Skin Redness. Skin burns.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. 
Eyes Redness. Pain. Blurred vision.  Wear safety goggles 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. Further see Inhalation.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT wash away into sewer. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water.  Do not transport with food and feedstuffs.
Marine pollutant. 
EC Classification
Symbol: Xn; R: 22-36/37/38; S: (2)-26-28-37 
UN Classification
UN Hazard Class: 8; UN Pack Group: III 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
  Provision to contain effluent from fire extinguishing. Separated from food and feedstuffs. Dry. 

IMPORTANT DATA
Physical State; Appearance
WHITE CRYSTALS. 

Physical dangers
 

Chemical dangers
Decomposes on heating and on burning. This produces highly irritating fumes including maleic anhydride. The solution in water is a medium strong acid. 

Occupational exposure limits
TLV (NOT-ESTABLISHED):. 

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

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

Effects of short-term exposure
The substance is severely irritating to the eyes, skin and respiratory tract. 

Effects of long-term or repeated exposure
Repeated or prolonged contact with skin may cause dermatitis. The substance may have effects on the kidneys. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Decomposes at 135°C
Melting point: 131°C
Relative density (water = 1): 1.59
Solubility in water, g/100ml at 25°C: 78
Octanol/water partition coefficient as log Pow: -0.5  
The substance is toxic to aquatic organisms. 

NOTES
 

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
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    See Also:
       Toxicological Abbreviations