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Physical & Chemical properties

Melting point / freezing point

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Description of key information

Estrone melts at 262.4 °C (polymorph I) and no pressure was reported.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
262.4 °C

Additional information

Estrone is a solid under ambient conditions. It is found to exist in at least three polymorphic forms, called polymorphs I, II and II. The investigated batches in this study correspond to polymorph II. The examination of the sublimate by X-Ray powder diffraction shows that already at 230 °C nearly complete transformation into polymorph I took place. At 262.4°C the melting point of polymorph I was detected.