Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content
NIOSH

MALEIC ACID

ICSC: 1186

(Z)-Butenedioic acid
cis-1,2-Ethylenedicarboxylic acid
Malenic acid
C4H4O4 / HOOCCH=CHCOOH
Molecular mass: 116.1
ICSC # 1186 		CAS # 110-16-7
RTECS # OM9625000
UN # 1759
EC # 607-095-00-3
October 10, 1997 Validated

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.
Powder, water spray, foam, carbon dioxide.
EXPLOSION


EXPOSURE
PREVENT DISPERSION OF DUST! STRICT HYGIENE!

•INHALATION Cough. Laboured breathing.
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.
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 take to a doctor.
•INGESTION Burning sensation. (Further see Inhalation).
Do not eat, drink, or smoke during work.
Rinse mouth. Do NOT induce vomiting. Give plenty of water to drink. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Do NOT wash away into sewer. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water. (Extra personal protection: P2 filter respirator for harmful particles).
Provision to contain effluent from fire extinguishing. Separated from food and feedstuffs. Dry.
Do not transport with food and feedstuffs.
Marine pollutant.
Xn symbol
R: 22-36/37/38
S: 2-26-28-37
UN Hazard Class: 8
UN Packing Group: III
ICSC: 1186 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

MALEIC ACID

ICSC: 1186

I

M

P

O

R

T

A

N

T


D

A

T

A

PHYSICAL STATE; APPEARANCE:
WHITE CRYSTALS.

PHYSICAL DANGERS:


CHEMICAL DANGERS:
The substance decomposes on heating and on burning producing 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 irritates severely the eyes, the skin and the 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

Decomposes below boiling point at 135°C
Melting point: 131°C
Relative density (water = 1): 1.59
Solubility in water, g/100 ml at 25°C: 78
Octanol/water partition coefficient as log Pow: -0.5

ENVIRONMENTAL
DATA

The substance is toxic to aquatic organisms.

N O T E S

ADDITIONAL INFORMATION



ICSC: 1186 MALEIC ACID
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
Top