P-Phenylenediamine (PPD) is a white to light-purple crystalline aromatic amine that oxidizes to dark colors on exposure to air. It is one of the most widely used primary intermediates in oxidative hair dyes and is the key building block for high-performance permanent hair color formulations. P-Phenylenediamine (PPD) is also employed in rubber antioxidants, textile dyes, fur dyes, photographic developers, and certain engineering polymers.

 

Technical Specification

ITEMS SPECIFICATIONS
Appearance White Crystal or flake
Purity ≥99.9%
Fe ≤10ppm

 

Packaging and Storage

  • Packed in 25kgs net fibre drums.
  • Store in a cool, dry, well-ventilated area away from oxidizing agents and direct sunlight.

 

Applications of P-Phenylenediamine (PPD)

Permanent Hair Dyes:
Primary intermediate for dark shades (brown, black, intense reds); provides excellent gray coverage and long-lasting color.

Rubber & Tire Industry:
Precursor for antioxidants 6PPD (CAS 793-24-8) and IPPD, used as antiozonants.

Textile & Fur Dyes:
Azo dye intermediate for black and dark-colored fabrics and leathers.

Photographic Chemicals:
Developing agent in black-and-white photography.

Polymer Industry:
Monomer for poly(p-phenylenediamine) and aramid fibers.

 

Frequently Asked Questions (FAQs)

What is P-Phenylenediamine (PPD)?
P-Phenylenediamine (CAS 106-50-3) is an aromatic amine used primarily as the main intermediate in permanent oxidative hair dyes and as a rubber antioxidant. It reacts with hydrogen peroxide to form colored bandrowski’s base compounds inside the hair shaft.

Why does P-Phenylenediamine (PPD) turn black when exposed to air?
PPD rapidly oxidizes in air, forming Bandrowski’s base and other quinone-type polymers, which are dark in color. This is the same mechanism that creates permanent color on hair when mixed with hydrogen peroxide.

Can P-Phenylenediamine (PPD) be used for dyeing textiles or leather?
Yes, widely used for black and dark shades on cotton (with sulfur dyes) and fur/leather dyeing. It produces excellent fastness properties.

Can PPD be used in beard or eyebrow dyes?
No. In the EU and many countries, PPD is prohibited in products applied to eyebrows, eyelashes, or beard due to higher risk of severe allergic reactions near the eyes.

How should P-Phenylenediamine (PPD) be stored long-term?
Keep sealed in original packaging, protected from light and moisture at temperatures below 30°C.

 

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