Amines
REACH
p-phenylenediamine
CAS Number
106-50-3
EC Number
203-404-7
Abbreviation
PPD
What is p-phenylenediamine?
p-Phenylenediamine (CAS 106-50-3), abbreviated PPD or p-Diaminobenzene, is an aromatic diamine used in polymer, textile, and cosmetic manufacturing.
Where is p-phenylenediamine used?
- Rubber and polymer processing: antiozonants and antidegradants that extend service life of tires, belts, and industrial rubber goods
- Textile and leather: key intermediate in synthesis of azo dyes and sulfur dyes
- Aramid fiber production: monomer in polycondensation reactions, including high-performance materials like Kevlar
- Personal care: oxidative colorant intermediate in hair dye formulations
- It reacts with hydrogen peroxide to produce permanent color.
Good to know: Proper handling and storage are critical to prevent oxidation and ensure chemical stability.
Commercial specifications
- Packaged in sealed, nitrogen-purged containers
Other Names (Synonyms)
pPDA|paraphenylene-diamine|p-Diaminobenzene|benzene-1,4-diamine|4-phenylenediamine|4-Aminoaniline|1,4-phenylenediamine|1,4-diaminobenzene|PPD
What are the physical properties of p-phenylenediamine?
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℃
How is p-phenylenediamine classified and handled safely? Learn More
Danger
GHS06· Toxic GHS09· Environmental Hazard GHS07· Irritant GHS08· Health Hazard GHS05· Corrosive
Hazard Statements
H301 Toxic if swallowed
H311 Toxic in contact with skin
H315 Causes skin irritation
H317 May cause an allergic skin reaction
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.
Which trade and regulatory codes apply to p-phenylenediamine?
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