Hydroxyethyl-p-phenylenediamine sulfate

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

It functions as a coupler or primary dye precursor that develops color upon oxidation, enabling formulators to achieve specific shade targets across a broad tonal range in various applications.

In professional and retail hair color products, it is incorporated into oxidative dye systems to produce natural-looking brown and dark shades with reliable color fastness and stability.

Textile and fiber dyeing operations use it to achieve deep, uniform coloration on protein-based substrates such as wool. Leather finishing processes employ it where controlled oxidative dyeing is required.

It also serves as a building block in the synthesis of pharmaceutical and specialty chemical intermediates where a functionalized phenylenediamine scaffold is needed for complex molecular structures.

Hydroxyethyl-p-phenylenediamine sulfate is supplied as a crystalline powder. Standard grades include cosmetic-grade material compliant with relevant personal care industry specifications for safety.

Technical-grade material is also available for industrial dyeing and synthesis applications. Packaging is typically offered in kilogram quantities for laboratory and development use by researchers.

The product scales to bulk drum supply for commercial manufacturing. This ensures a consistent supply chain for large-scale production requirements in the global chemical and cosmetic markets.

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