Maleic Anhydride
- CAS
- 108-31-6
- EC
- 203-571-6
- Sectors
- Plastics & Polymers, Coatings, Adhesives, Sealants & Elastomers
Maleic Anhydride (CAS 108-31-6) is an organic acid anhydride produced through oxidation of benzene or n-butane, supplied as white crystalline needles, lumps or pellets with a sharp odor, and it hydrolyzes readily to maleic acid in water; it serves as an intermediate for unsaturated polyester resins, coatings, lubricants and surfactants.
Typical Properties
| Molecular formula | C4H2O3 |
|---|---|
| Molecular weight | 98.06 g/mol |
| Appearance | Maleic anhydride is colorless needles, white lumps, or pellets. Irritating, choking odor. |
| Form | powder |
| Color | White |
| Odor | Mild acrid odor. |
| Melting point | 52.8 °C |
| Boiling point | 202.0 °C @ Press: 760 Torr |
| Density | 1.48 g/cm³ |
| Water solubility | 79 g/100 mL (25 °C) |
| Flash point | 218 °F |
| pH | 0.8 (550g/l, H2O, 20°C)Hydrolysis |
| GHS signal word | Danger · Corrosive, Acute toxicity, Irritant / harmful, Health hazard |
| HS code | 29171400 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Maleic Anhydride
Applications
Used as an intermediate in unsaturated polyester resins, coatings, lubricants, and surfactants. In agriculture, it’s employed as a plant growth regulator and corrosion inhibitor.
Safety & Risks
Corrosive and irritating to eyes and respiratory tract; handle under ventilation and avoid moisture.
Packaging
Delivered in 25 kg bags or molten in ISO tank containers. Store cool, dry, and tightly sealed.