Maleic Anhydride

Cas Number


Other Names

Maleic anhydride

cis-Butenedioic anhydride


Maleic acid anhydride

Toxilic anhydride

The formula



Maleic anhydride is an organic compound. It is the acid anhydride of maleic acid. It is a colorless or white solid with an acrid odor. It is produced industrially on a large scale for applications in coatings and polymers.

Physical and Chemical Properties
Physical state and appearance White, Light yellow piece or sliced crystal
Molecular Weight 98.06 g/mole
pH (1% soln/water) 7 [Neutral.]
Color White.
Boiling Point 202°C (395.6°F)
Flash point CLOSED CUP: 103.33°C (218°F).
Melting Point 52.8°C (127°F)
Specific Gravity 1.48 (Water = 1)
Vapor Density 3.4 (Air = 1)
Dispersion Properties See solubility in water
Solubility Soluble in cold water, hot water. Very slightly soluble in methanol.
Content(based on Maleic anhydride) ≥ 99.5
Molten colour ≤ 50
Solidification point ≥ C 52
Ash % ≤ 0.005
Fe content ppm ≤ 5

1. Maleic anhydride's largest use today is in the production of unsaturated polyester resins. These resins are used primarily in fibre-reinforced plastics; materials with a wide and growing range of applications in boating, automobile and construction industries

2. Another significant use of maleic anhydride is in the manufacture of alkyd resins, which are in turn used in paints and coatings

3. Other applications where maleic anhydride is used include the production of agricultural chemicals, malic acid, copolymers, fumaric acid, lubricant additives, surfactants and plasticizers