Substance profile
Dapsone
Dapsone is crystals from 95% ethanol and is odorless.
01 · Identification
What Dapsone is
Dapsone is crystals from 95% ethanol and is odorless. It melts at 80 °C, is practically insoluble in water.
Under the GHS it carries the signal word Warning.
Other names for Dapsone
- 4,4'-diamino diphenyl sulfone
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 |
|---|---|
| H302 | Harmful if swallowed. |
03 · Physical and chemical properties
Dapsone 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 |
|---|---|---|---|
| Melting point | 80 °C (176 °F) | between | HSDB |
| 176 °C (348.8 °F) | DOE PAC | ||
| 175.5 °C (347.9 °F) | range, midpoint shown | HSDB | |
| Density | 1.33 g/cm³ | at 25 °C | CAMEO |
| Solubility | Soluble in alcohol, methanol, acetone, dilute hydrochloric acid. Practically insoluble in water. | HSDB | |
| Insoluble in fixed and vegetable oils. | HSDB | ||
| Slightly soluble in deuterated dimethyl sulfoxide. | HSDB | ||
| Vapor pressure | 3e-8 mmHg | Haz-Map | |
| Flash point | 160 °C (320 °F) | above this value | CAMEO |
| Vapor density | 8.3 (air = 1) | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Dapsone
Storage conditions
Keep container tightly closed in a dry and well-ventilated place. Light sensitive.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Incompatible materials: Strong oxidizing agents
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
4,4'-SULFONYLDIANILINE can neutralize acids in exothermic reactions to form salts plus water. May be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. Flammable gaseous hydrogen is generated in combination with strong reducing agents, such as hydrides. Incompatible with strong oxidizing agents. Also incompatible with epoxy resins under uncontrolled conditions (NTP, 1992).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Dapsone in the storage compatibility matrix →