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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure value was presented as 3 x 10-9 mmHg at 100 °C (McLellan et al., 1988).

The estimated value of Vapour Pressure, using EPIWIN Program, was found to be 2.41 x 10-8 mm Hg ( 3.21x 10-6 Pa) at 25°C.

The vapour pressure of HMX was calculated as 3.33x10-14 at 25 °C by the the Clausius-Clapeyron equation:  log P = A - B/T, where T is in degrees Kelvin (K) (Burrows et al., 1989).

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

Since the melting point of HMX is between 200 and 300°C, a recognized caculation is sufficient according to Regulation (EC) No 1907/2006. The estimated value of Vapour Pressure for HMX, using the EPIWIN Program, is chosen as the key value for the CSA.