Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Dapsone is a crystalline white to off-white powder with no detectable odor and low relative density equal to 0.8201 at 20°C.The diameter of Dapsone particles is from 0.31 µm to 301.68 µm. The value of its melting point was published to be 175 deg C and its boiling point estimated to be 438°C both at 101325Pa. Based on read-across approach, the vapour pressure was estimated to be < 1.5x10-3 Pa and the surface tension equal to 73.6 mN/m at 20°C. Log Kow is 0.97 at 25 deg C. Also Dapsone is poorly soluble in water with a water solubility value of 380 mg/L and is soluble in alcohol, methanol, acetone and dilute hydrochloric acid. Dapsone has no oxidizing properties and is considered “not a self-heating substance” and ‘not highly flammable’. Its dissociation constant value is 13 (pKb value).