ISO 1390-1:1977

Maleic anhydride for industrial use — Methods of test — Part 1: General

The document also specifies the method to be used for the determination of the crystallizing point. Before carrying out the tests, the sample shall be grind to a fine powder and shall be mixed thoroughly. Exposure to moist air may lead to the formation of maleic acid. – ISO 1390, Parts 1 to 6, replace ISO Recommendation R 1390-1970.