CAS Registry Number

CAS 120-18-3 — 2-Naphthalenesulfonic acid

2-Naphthalenesulfonic acid is an aromatic sulfonic acid widely used as a dye intermediate, pH regulator, and in the synthesis of azo dyes, surfactants, and pharmaceuticals. It appears as a white to off-white crystalline powder with high solubility in water and organic solvents. This product has a CAS number of 120-18-3, a molecular formula of C10H7SO3H, and a molecular weight of 208.23 g/mol. It is classified with a **Signal Word: Danger** and should be stored at ambient conditions. Molekula supplies 2-Naphthalenesulfonic acid from research to bulk quantities with full documentation and ISO 9001:2015 traceability.