Substance profile
P-Phenylenediamine
P-Phenylenediamine is white to slightly red crystals.
01 · Identification
What P-Phenylenediamine is
P-Phenylenediamine is white to slightly red crystals. Its molecular formula is C6H8N2 and its molecular weight is 108.14 g/mol. It boils at 267 °C, melts at 146 °C.
Under the GHS it carries the signal word Danger. It is classed as hazardous Air Pollutants (HAPs).
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H331 | Toxic if inhaled. |
| H311 | Toxic in contact with skin. |
| H301 | Toxic if swallowed. |
| H319 | Causes serious eye irritation. |
| H317 | May cause an allergic skin reaction. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P260, P261, P264, P270, P271, P272, P273, P280, P301, P302, P304, P305, P310, P313, P330, P333, P337, P338, P352, P391, P501
03 · Physical and chemical properties
P-Phenylenediamine properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 267 °C (512.6 °F) | HSDB | |
| 267.22 °C (513 °F) | NIOSH | ||
| 267.22 °C (513 °F) | at 760 mmHg | CAMEO | |
| Melting point | 146.11 °C (295 °F) | NIOSH | |
| 140 °C (284 °F) | CAMEO | ||
| Density | 1.1 g/cm³ | ICSC | |
| 1 g/cm³ | DOE PAC | ||
| Greater than 1 (water= 1) | HSDB | ||
| Solubility | SOL IN 100 PARTS COLD WATER; SOL IN ALCOHOL, CHLOROFORM, ETHER | HSDB | |
| SOL IN HOT BENZENE | HSDB | ||
| Water solubility= 38,000 ppm | HSDB | ||
| Vapor pressure | 1 mmHg | below this value | NIOSH |
| 1 mmHg | below this value, at 21 °C, technical product | HSDB | |
| Flash point | 155.56 °C (312 °F) | NIOSH | |
| 155 °C (311 °F) | CAMEO | ||
| 156 °C (312.8 °F) | ICSC | ||
| Autoignition temperature | 400 °C (752 °F) | ICSC | |
| Lower explosive limit (LEL) | Minimum explosive concentration: 0.025 g/l | HSDB | |
| The finely powdered base is a significant dust explosion hazard. | HSDB | ||
| Combustible Solid | NIOSH | ||
| Vapor density | 3.72 (air = 1) | HSDB | |
| 3.7 (air = 1) | ICSC |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling P-Phenylenediamine
Storage conditions
Keep well closed and protected from light.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Contact with strong oxidizers may cause fires and explosions.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
P-PHENYLENEDIAMINE is the stongest of the weak aromatic bases. It neutralizes acids in weak exothermic reactions to form salts. May be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. Reacts readily with oxidizing agents (NTP, 1992).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check P-Phenylenediamine in the storage compatibility matrix →