Maleic Acid BP

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

Test (A)


Test (B)


Test (C)


(a)Dilute 5ml of solution with 10ml water. The pH of dilution  is less than 2

(b) Examine the Chromatograms obtained in the test for fumaric acid

(c) Specified Test. Heat on a water bath for 15 min. A violet-pink color develops

Solubility Freely soluble in water and in alcohol
Appearance of solution The solution is clear and not more intensely colored than the reference solution Y7
Fumaric acid Specified Test
Iron Not more than 5 ppm
Heavy Metals Not more than 10 ppm
Water Not more than 2.0%
Sulfated ash Not more than 0.1%
Assay Not less than 99.0% and not more than 101.0% calculated with reference to the anhydrous substance.


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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