Maleic Acid USP

Maleic Acid also known as cis-Butenedioic Acid is a white, crystalline, water soluble organic compound.  Maleic acid is the cis-isomer of butenedioic acid, whereas fumaric acid is the trans-isomer. It is mainly used as a precursor to fumaric acid, and relative to its parent maleic anhydride, maleic acid has few applications.


The major industrial use of maleic acid is its conversion to fumaric acid. It may be used to form acid addition salts with drugs to make them more stable, such as indacaterol maleate. It is also used as an adhesion promoter for different substrates, such as nylon and zinc coated metals.


Chemical Name: Maleic Acid
Synonyms: (Z)-Butenedioic Acid, Malenic acid
Molecular Formula: C4H4O4
Molecular Weight: 116.1 g/mol
CAS No:  110-16-7


General Specifications:

Test Specification
Characters It occurs as a white crystalline powder






(a) Dissolve 500mg of maleic acid in 10ml water. The pH of the solution is less than 2

(b) Specified Test

(c) Infrared Absorption

Solubility Freely soluble in water and in alcohol, sparingly soluble in ether
Appearance of solution The solution is clear and not more intensely colored than the reference solution
Color and clarity of the solution The solution is clear and not more intensely colored than the reference solution
Water Maximum 2.0%
Residue on ignition Not more than 0.1%
Heavy metals Not more than 10 ppm
Fumaric acid Maximum 1.5%
Iron Maximum 5 ppm
Residual Solvents Meets the requirements
Assay Not less than 99.0% and not more than 101.0% calculated on anhydrous basis.


Shelf life, Storage and Packing

It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.


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We observe WHO Good manufacturing practice and Good laboratory practice.

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