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Fumaric Acid

CAS Number: 110‑17‑8

Synonyms: Fumaric acid; trans‑but‑2‑enedioic acid; 2‑butenedioic acid; Lichenic acid

Chemical Formula:C₄H₄O₄

Product Introduction

Fumaric acid is a white crystalline solid with a tart, acidic taste—about 1.5× stronger than citric acid. Approved as a food acidulant (E297), it’s also used in pharmaceutical formulations, polymer resin production, and unsaturated polyester manufacture.

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Physical & Chemical Properties

Property	Value
Appearance	White crystalline powder
Odor	Odorless
Purity	≥ 99 % (GC)
Density @ 20 °C	~1.635 g/cm³
Melting Point	~287 °C (decomposes)
Molecular Weight	116.07 g/mol
Solubility in Water @ 25 °C	~6.3 g/L
pH (1% solution)	~2.0–2.5

Applications

Food additive:Acidulant in beverages, baking, snacks; flavor enhancer.
Polymer & resin manufacture:Key raw material for unsaturated polyester and alkyd resins.
Pharmaceutical & chemical intermediate:Used in iron fumarate supplements, bleaching, and fine chemical synthesis.
pH control:In laboratory buffers due to its stable, weak acid properties.