Hydroxyethyl-p-phenylenediamine sulfate

Hydroxyethyl-p-phenylenediamine sulfate (CAS 93841-25-9), also marketed as COLOREX 25DAPE, is an oxidative hair dye intermediate used in permanent and semi-permanent color formulations.

Where is Hydroxyethyl-p-phenylenediamine sulfate used?

• Hair color: coupler or primary dye precursor that develops color upon oxidation, enabling specific shade targets
• Professional and retail hair color: incorporated into oxidative dye systems for natural-looking brown and dark shades
• Textile and fiber dyeing: deep, uniform coloration on protein-based substrates such as wool
• Leather finishing: controlled oxidative dyeing
• It also serves as a building block in the synthesis of pharmaceutical and specialty chemical intermediates.

Commercial specifications

• Cosmetic-grade material compliant with personal care industry specifications
• Packaging in kilogram quantities; bulk drum supply