3,3′-Dimethylbenzidine

3,3'-Dimethylbenzidine (CAS 119-93-7, EC 204-358-0) is an aromatic diamine also known as o-Tolidine, Tolidine, or 2-Tolidine, with molecular formula C14H16N2. It belongs to the benzidine family of amines and serves as a chemical intermediate rather than a finished product.

In textile and leather dyeing, o-Tolidine acts as a diazo component that couples with other aromatic compounds to produce azo dyes with strong fiber affinity. In polymer and elastomer manufacturing, its two primary amine groups react with isocyanates or epoxies to form cross-linked networks, contributing to improved mechanical properties. It also functions as a precursor in printing ink colorant synthesis.

This material is supplied as a powder or wet cake and is subject to REACH regulation, with classification as a Category 1A carcinogen requiring strict handling controls. Procurement teams should confirm SDS documentation and confirm compliance with applicable EU chemical regulations before ordering.