IPCS INCHEM Home
MALEIC ACIDICSC: 1186
(Z)-Butenedioic acid
cis-1,2-Ethylenedicarboxylic acid
November 2019
CAS #: 110-16-7
UN #: 3261 (n.o.s.)
EC Number: 203-742-5

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Combustible. Gives off irritating or toxic fumes (or gases) in a fire.    NO open flames.    Use water spray, powder, foam, carbon dioxide.   

 PREVENT DISPERSION OF DUST! STRICT HYGIENE!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough. Laboured breathing.  Use local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness. Pain.  Protective gloves. Protective clothing.  Wear protective gloves when administering first aid. 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. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water. 

According to UN GHS Criteria

correxcl mark;warn
WARNING
May be corrosive to metals
Harmful if swallowed or in contact with skin
Causes skin and eye irritation
May cause an allergic skin reaction
May cause respiratory irritation
Toxic to aquatic life 

Transportation
UN Classification
UN Hazard Class: 8; UN Pack Group: III 

STORAGE
Provision to contain effluent from fire extinguishing. Separated from food and feedstuffs. Dry. Store only in original packaging. 
PACKAGING
Do not transport with food and feedstuffs. 
MALEIC ACID ICSC: 1186
PHYSICAL & CHEMICAL INFORMATION

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. 

Formula: C4H4O4 / HOOCCH=CHCOOH
Molecular mass: 116.1
Decomposes at 135°C
Melting point: 131°C
Relative density (water = 1): 1.59
Solubility in water, g/100ml at 25°C: 78 (soluble)
Vapour pressure, Pa at 25°C: 0.0048
Flash point: 127°C
Octanol/water partition coefficient as log Pow: -0.5  


EXPOSURE & HEALTH EFFECTS

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

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

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


OCCUPATIONAL EXPOSURE LIMITS
 

ENVIRONMENT
The substance is toxic to aquatic organisms. 

NOTES
 

ADDITIONAL INFORMATION
  EC Classification
 

All rights reserved. The published material is being distributed without warranty of any kind, either expressed or implied. Neither ILO nor WHO nor the European Commission shall be responsible for the interpretation and use of the information contained in this material.
    See Also:
       Toxicological Abbreviations