This standard specifies the basic requirements, technical requirements, test methods, inspection rules, labeling, packaging, transportation, storage and quality commitment of maleic anhydride for industrial use. This standard applies to industrial maleic anhydride produced by catalytic oxidation of n-butane as raw material. Molecular formula: C4H2O3 Structural formula: Relative molecular mass: 98.056 (according to the 2016 international relative atomic mass).