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Physical & Chemical properties

Melting point / freezing point

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Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Guideline:
other: Not reported
Type of method:
other: Not reported
Key result
Melting / freezing pt.:
16.8 °C
Atm. press.:
ca. 101 325 Pa
Conclusions:
The melting point of sulphur trioxide is 16.8 °C
Executive summary:

The melting point of sulphur trioxide is reported to be 16.8 °C. However, it should be noted that the different polymerised forms of the substance have different melting points: α form (62.4 °C), β form (32.5 °C), γ form (16.8 °C). Melted sulphur trioxide usually exists in the γ form.

Description of key information

The melting point of sulphur trioxide is reported to be 16.8 °C. However, it should be noted that the different polymerised forms of the substance have different melting points: α form (62.4 °C), β form (32.5 °C), γ form (16.8 °C). Melted sulphur trioxide usually exists in the γ form.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
16.8 °C

Additional information

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