Registration Dossier

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Description of key information

The melting point of Azobis (cyanoisopropyl), also known as 2,2’-Azobis (isobutyronitrile) was investigated and found to be 100°C - 103°C (373 -376K); Source: Physicochemical property study report (1987 inspection of existing chemicals).  There is also a publication 'Fire Protection Guide on Hazardous Materials' by the National Fire Protection Agency (7th ed Boston MA 1978) that gives the melting point of the substance as 105°C. 

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
103 °C

Additional information

The slight differences in the value of the substance's melting point between the two results (i.e. 101 -103°C vs 105°C) could be due to possible variation in methods. However, no data were available in order to compare the methods or conditions.