Registration Dossier
Registration Dossier
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EC number: 200-164-5 | CAS number: 53-16-7
Melting point / freezing point
Administrative data
Link to relevant study record(s)
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.
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