Fumaric Acid

Cas Number


Other Names

Fumaric acid

trans-1,2-Ethylenedicarboxylic acid

2-Butenedioic acid

trans-butenedioic acid

Allomaleic acid

Boletic acid

Donitic acid

Lichenic acid

The formula



Fumaric acid or trans-butenedioic acid is the chemical compound with the formula HO2CCH=CHCO2H. This white crystalline compound is one of two isomeric unsaturated dicarboxylic acids, the other being maleic acid.

Physical and Chemical Properties
Physical state and appearance Liquid
Odor Ammoniacal. Odorless. (Slight.)
Molecular Weight 45.04 g/mole
Color Colorless
Boiling Point 210.5°C (410.9°F)
Flash point 150°C
Melting Point 2.55°C (36.6°F)
Specific Gravity 1.1334 (Water = 1)
Water/Oil Dist. Coeff The product is more soluble in water; log(oil/water) = -1.5
Solubility See solubility in water, diethyl ether, acetone
Appearance white powder
Purity, % 99.0 min
Color hazen 50 max
Melting Point 282 C
Water content , % 0.5 max

1. Fumaric acid has been used in food and beverage products since 1946. It is currently used in wheat and corn tortillas, sour dough and rye breads, refrigerated biscuit doughs, fruit juice and nutraceutical drinks, gelatin desserts, gelling aids, pie fillings and wine

2. It is also used in animal feed

3. Industrial uses of Fumaric acid include - Unsaturated Polyester, alkyd resins, printing Inks, paper sizing

4. Fumaric acid is used in the manufacture of polyester resins and polyhydric alcohols and as a mordant for dyes