Substance profile
O-Phenylenediamine
O-Phenylenediamine is brownish-yellow leaflets from water; plates from chloroform.
01 · Identification
What O-Phenylenediamine is
O-Phenylenediamine is brownish-yellow leaflets from water; plates from chloroform. Its molecular formula is C6H8N2 and its molecular weight is 108.14 g/mol. It boils at 257 °C, melts at 102 °C.
Under the GHS it carries the signal word Danger.
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 |
|---|---|
| H351 | Suspected of causing cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H341 | Suspected of causing genetic defects <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H301 | Toxic if swallowed. |
| H332 | Harmful if inhaled. |
| H312 | Harmful in contact with skin. |
| 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: P201, P260, P261, P264, P270, P271, P272, P273, P280, P301, P302, P304, P305, P308, P310, P312, P313, P330, P333, P337, P338, P352, P391, P501
03 · Physical and chemical properties
O-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 | 257 °C (494.6 °F) | HSDB | |
| 257 °C (494.6 °F) | at 760 mmHg | DOE PAC | |
| 256.94 °C (494.5 °F) | range, midpoint shown, at 760 mmHg | CAMEO | |
| Melting point | 102.1 °C (215.8 °F) | HSDB | |
| 104 °C (219.2 °F) | DOE PAC | ||
| 103.06 °C (217.5 °F) | range, midpoint shown | CAMEO | |
| Solubility | Because of ... limited solubility in cold water/o-phenylenediamine/ can be recrystalized from water | HSDB | |
| Freely soluble in alcohol, chloroform, ether | HSDB | ||
| Soluble in water, ethyl ether, benzene, chloroform; very soluble in ethanol | HSDB | ||
| Vapor pressure | 0.0098 mmHg | at 20 °C | ICSC |
| 0.0021 mmHg | at 25 °C | HSDB | |
| Flash point | 156 °C (312.8 °F) | Closed cup | HSDB |
| 156.11 °C (313 °F) | CAMEO | ||
| 156 °C (312.8 °F) | ICSC | ||
| Lower explosive limit (LEL) | 1.5 % by volume | HSDB | |
| Finely dispersed particles form explosive mixtures in air. | HSDB | ||
| Vapor density | 3.73 (air = 1) | ICSC |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling O-Phenylenediamine
Storage conditions
Separated from food and feedstuffs. Well closed.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
1,2-PHENYLENEDIAMINE a weak aromatic amine base neutralizes acids in exothermic reactions to form salts. May be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. Darkens on exposure to air (Roger Patrick, DuPont Engineer).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check O-Phenylenediamine in the storage compatibility matrix →