CAS of trans-butenedioic acid or fumaric acid: 110-17-8
Physical properties of Fumaric Acid
Appearance: colorless crystal
Melting point: 300-302 °C (sealed) Sublimation temperature: 165°C (at 17 mm Hg)
Melting point: 299-300 °C Relative density: 1.635 (at 20/4 °C)
Solubility: soluble in water and ethanol, slightly soluble in cold water, ether, and benzene, and freely soluble in hot water
Uses of Fumaric Acid
As a sour agent categorized as a food additive, it is used mostly together with another sour agent called citric acid for refreshing beverages, fruit-flavored candies, jelly, ice cream, and the like. The monosodium salt produced by the reaction of fumaric acid with sodium hydroxide is also used as a sour seasoning as well as an intermediate for synthetic resins and mordants. It is mainly used for the processing of food like meat and fish products. Fumaric acid can also be used as an acidity regulator, an acidifier, an antioxidant aid, a pickling accelerator, or a spice. It is a strong buffer maintaining the solution with a PH of about 3.0 and plays an important role in preventing bacteria and fungus. In the meantime, it is one of the strongest solid acids with an astringent taste and a low absorption rate, which helps to extend the shelf life of powder products. Sodium fumarate transformed from fumaric acid has better water solubility and flavor.
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China [CN] 
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