Overview
p-Phenylenediamine ( CAS 106-50-3 ), commonly abbreviated as PPD or p-Diaminobenzene, is an aromatic diamine used across polymer, textile, and cosmetic manufacturing. It functions primarily as a curing agent, dye intermediate, and antioxidant precursor in industrial formulations.
In rubber and polymer processing, PPD derivatives serve as antiozonants and antidegradants, extending the service life of tires, belts, and industrial rubber goods. The textile and leather industries rely on PPD as a key intermediate in the synthesis of azo dyes and sulfur dyes.
These applications enable deep, wash-resistant coloration on fiber substrates. In aramid fiber production, including high-performance materials like Kevlar, it acts as a monomer in polycondensation reactions. This contributes directly to tensile strength and flame resistance.
Hair dye formulations in personal care use PPD as an oxidative colorant intermediate. In these applications, it reacts with hydrogen peroxide to produce permanent color. This chemical is essential for achieving long-lasting results in professional cosmetic products.
p-Phenylenediamine is supplied as a crystalline solid, typically in flake or powder form. Technical grade is the standard offering for industrial polymer and dye applications. This ensures the material meets the necessary specifications for large-scale manufacturing.
Material is commonly packaged in sealed, nitrogen-purged containers to maintain quality during storage and transit. Proper handling and storage are critical to prevent oxidation and ensure the chemical stability of the product upon arrival at your facility.
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Physical Properties
| Melting Point | 145-147 °C |
| Boiling Point | 267 °C |
| Density | 1.1 g/cm³ |
| Flash Point | 156 °C |
| Appearance | p-Phenylenediamines are white to slightly red crystalline solids. They have been described as gray “light brown” which may result from exposure to air. |
| Color | White, gray, or purple to brown |
| Form | Powder or Flakes |
| Water Solubility | 47 g/L (25 ºC) |
| Vapor Pressure | 1.08 mm Hg ( 100 °C) |
| Refractive Index | 1.6339 (estimate) |
| pH | 9 (50g/l, H2O, 20℃) |
| Log P | -0.84 at 20℃ |
Safety & Handling
Danger GHS06 GHS09 GHS07 GHS08 GHS05 Hazard Statements H301 Toxic if swallowed H311 Toxic in contact with skin H315 Causes skin irritation H317 May cause an allergic skin reaction H318 Causes serious eye damage H319 Causes serious eye irritation H320 Causes eye irritation H331 Toxic if inhaled H333 May be harmful if inhaled H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects H301+H311+H331 Toxic if swallowed, in contact with skin or if inhaled Precautionary Statements P233 Keep container tightly closed. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P262 Do not get in eyes, on skin, or on clothing. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 In case of inadequate ventilation wear respiratory protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P391 Collect spillage. P403 Store in a well-ventilated place. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P317 Get emergency medical help. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P342+P316 Get emergency medical help immediately. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29215119 |
| UN Number | 1673 |
| ADR Class | 6.1 |
| Packing Group | III |
| Storage Class | 6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 106-50-3
- EC Number
- 203-404-7
- Mol. Weight
- 108.14
- HS Code
- 29215119
- Category
- Pigments & Colorants