Maleic acid
CAS 110-16-7C4H4O4116.07 g/mol
Maleic acid is a butenedioic acid in which the double bond has cis- (Z)-configuration. It has a role as a mouse metabolite, a plant metabolite and an algal metabolite. It is a conjugate acid of a maleate and a maleate(1-).
IUPAC: (Z)-but-2-enedioic acid
PubChem
Physical & Chemical Properties
| Melting Point | 266 to 268 °F (NTP, 1992) |
| Boiling Point | 275 °F at 760 mmHg (decomposes) (NTP, 1992) |
| Density | 1.59 at 68 °F (USCG, 1999) - Denser than water; will sink |
| Solubility | greater than or equal to 100 mg/mL at 66 °F (NTP, 1992) |
| Flash Point | 127 °C |
| Vapor Pressure | Negligible (NTP, 1992) |
| Appearance | Maleic acid is a colorless crystalline solid having a faint odor. It is combustible though it may take some effort to ignite. It is soluble in water. It is used to make other chemicals and for dyeing and finishing naturally occurring fibers. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2917
Data: UN Comtrade
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