Registration Dossier
Registration Dossier
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EC number: 204-506-4 | CAS number: 121-91-5
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
Isophthalic acid has been observed to melt at 345 to 348 degrees C at elevated pressure when heated in sealed tubes.
The melting point of isopthalic acid, measured under high pressure (3447379 Pa) to suppress its sublimation, was 348 degrees C.
The vapour pressure line plotted for IPA reaches 760 mm (atmospheric pressure) at 384 degrees C, which would imply that IPA first melts at a lower temperature and then boils at 384 degrees C, however there are no reports that this sequence of changes of state has ever been observed. Under standard atmospheric conditions, IPA sublimes with a direct transition from the solid to vapour phase. Melting and boiling occur only under elevated pressure under artificial conditions.
Key value for chemical safety assessment
Additional information
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