Decision document for: Maleic Acid - CAS No. 110-16-7 Maleic Anyhdride - CAS No. 108-31-6 You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more. Inert Reassessment Decision Document for Maleic Anhydride and Maleic Acid (PDF)(18 pp, 1 MB)