Home › Chemicals › Maleic Acid CAS 110-16-7: Maleic Acid (C4H4O4) Identity CAS Number 110-16-7 Molecular Formula C4H4O4 IUPAC Name (Z)-but-2-enedioic acid Molecular Weight 116.07 g/mol SMILES C(=C\C(=O)O)\C(=O)OSynonyms maleic acid, cis-butenedioic acid, toxilic acid, maleinic acid
2D Structure
Physical Properties Density 1.59 g/mL at 25°C Boiling Point 135.0°C Melting Point 135.0°C Flash Point 110.0°C Vapor Pressure 0.001 kPa at 20°C Refractive Index nD = 1.526 Dielectric Constant ε = 6.0
Safety & GHS Classification GHS05 Irritant
H302: Harmful if swallowed H314: Causes severe skin burns and eye damage H335: May cause respiratory irritation Storage: Store in a cool, dry area. Keep container tightly sealed. May decompose upon heating — avoid temperatures above 135°C. Store away from strong bases, oxidizers, and reducing agents.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Good PE Excellent PP Excellent PEEK Excellent PVDF Excellent
Rubbers Material Rating Viton Excellent NBR Good EPDM Excellent Silicone Good FKM Excellent
Metals Material Rating Stainless 316 Excellent Aluminum Good Copper Fair Brass Fair
Applications Unsaturated polyester resin manufacturing Maleic anhydride production (dehydration) Fumaric acid isomerization precursor Pharmaceutical intermediate Food additive (acidulant, E364) Metal chelating agent Textile finishing agent Water treatment scale inhibitor External References: PubChem
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