Substance profile
Diphenylamine
Diphenylamine is monoclinic leaflets from dilute alcohol with a pleasant, floral odor.
01 · Identification
What Diphenylamine is
Diphenylamine is monoclinic leaflets from dilute alcohol with a pleasant, floral odor. Its molecular formula is C12H11N and its molecular weight is 169.22 g/mol. It boils at 302 °C, melts at 52.8 °C, is soluble in water.
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 |
|---|---|
| H331 | Toxic if inhaled. |
| H311 | Toxic in contact with skin. |
| H301 | Toxic if swallowed. |
| H373 | May cause damage to organs <or state all organs affected, if known> through prolonged or repeated exposure <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Precautionary statements: P260, P270, P271, P273, P280, P301, P302, P304, P310, P314, P330, P352, P391, P501
03 · Physical and chemical properties
Diphenylamine 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 | 302 °C (575.6 °F) | HSDB | |
| 302.22 °C (576 °F) | NIOSH | ||
| 302.22 °C (576 °F) | at 760 mmHg | CAMEO | |
| Melting point | 52.78 °C (127 °F) | NIOSH | |
| 53 °C (127.4 °F) | ICSC | ||
| Density | 1.16 g/cm³ | HSDB | |
| 1.2 g/cm³ | ICSC | ||
| Solubility | 1 g dissolves in 2.2 ml of alcohol, 4 ml propyl alcohol; Freely sol in benzene, ether, glacial acetic acid, carbon disulfide. | HSDB | |
| Very sol in ethanol, acetone, benzene, carbon tetrachloride, pyridine, ethyl acetate; sol in ether, acetic acid; slightly sol in chloroform | HSDB | ||
| Soluble in oxygenated and aromatic solvents | HSDB | ||
| Vapor pressure | 0.00067 mmHg | at 25 °C | HSDB |
| 1 mmHg | at 108.33 °C | NIOSH | |
| 1 mmHg | at 108.28 °C | CAMEO | |
| Flash point | 153 °C (307.4 °F) | HSDB | |
| 152.78 °C (307 °F) | NIOSH | ||
| Autoignition temperature | 633.89 °C (1173 °F) | HSDB | |
| 635 °C (1175 °F) | CAMEO | ||
| 634 °C (1173.2 °F) | ICSC | ||
| Lower explosive limit (LEL) | Dust may be explosive if mixed with air in critical proportions and in presence of a source of ignition. | HSDB | |
| Combustible Solid; explosive if a cloud of dust is exposed to a source of ignition. | NIOSH | ||
| Vapor density | 5.82 (air = 1) | HSDB | |
| 5.8 (air = 1) | ICSC | ||
| Odor threshold | Odor perception threshold is 0.05 mg/L. | HSDB | |
| Odor Threshold Low: 0.02 [mg/m3] | Haz-Map | ||
| Odor threshold from AIHA | Haz-Map |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Fire and explosion
Fire and explosion behaviour of Diphenylamine
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Fire and explosion
...Diphenylamine /added to/...hexachloromelamine would explode if the amt were large and confined. Trichloromelamine behaves similarly...but with more flame and fume production.
Source: HSDB
05 · Handling and storage
Storing and handling Diphenylamine
Storage conditions
In general, materials which are toxic as stored or which can decompose into toxic components...should be stored in a cool, well-ventilated place, out of direct rays of the sun, away from areas of high fire hazard, and should be periodically inspected... Incompatible materials should be isolated from each other.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Can react with oxidizing materials
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
DIPHENYLAMINE discolors in light. This chemical can react violently with hexachloromelamine and trichloromelamine. It is incompatible with strong oxidizing agents and strong acids. It is also incompatible with iron and silver salts. It reacts with nitrogen oxides. (NTP, 1992)
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Diphenylamine in the storage compatibility matrix →