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EC number: 231-765-0 | CAS number: 7722-84-1
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
The recommended freezing point of pure hydrogen peroxide (100% w/w) is -0.43 °C.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 272.57 K
Additional information
According to the publication by Schumb et al. (1955) the recommended freezing point of pure hydrogen peroxide (100% w/w) is -0.43 °C at atmospheric pressure. This value is supported by information provided in other handbooks (Goor et al. 1989, Lide 2005). In the hydrogen peroxide - water system, the freezing point of each component is depressed by the addition of the other. Mixtures of hydrogen peroxide and water with a fraction of hydrogen peroxide between 45 and 60% exhibit a freezing point below -50 °C. An aqueous solution of hydrogen peroxide (35% w/w) has an approximate freezing point of -33 °C, an aqueous solution of hydrogen peroxide (49.9%) has an approximate freezing point of -55 °C.
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