CAS Registry Number

CAS 89-05-4 — Pyromellitic acid (1,2,4,5-Benzenetetracarboxylic acid)

Pyromellitic acid (1,2,4,5-Benzenetetracarboxylic acid, CAS 89-05-4) is a white crystalline solid used as a key precursor in the synthesis of polyimides, polyesters, and high-performance polymers for electronics, aerospace, and specialty coatings. It features four carboxylic acid groups on a benzene ring, enabling strong cross-linking properties. Pure pyromellitic acid has a molecular formula of C6H2(CO2H)4 and a molecular weight of 254.15 g/mol. Store at ambient conditions; the substance carries a signal word of "Warning" per GHS classification. Molekula supplies pyromellitic acid from research to bulk quantities with full documentation and ISO 9001:2015 traceability.