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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Physical & Chemical properties

Vapour pressure

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vapour pressure
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the melting point is above 300°C

Description of key information

According to Annex VII section 7.5, Column 2 of regulation (EC) 1907/2006, this study does not need to be conducted for solids having a melting point above 300°C. For the test item sodium azide, no melting point could be observed during DSC measurement. Between 370 °C and 425 °C the substance decomposes with an exothermic energy of 758 J/g. The onset temperature of this exothermic reaction is 378 °C and the maximum heat flow of 5 W/g was reached at 396 °C (please also refer to section 4.2).

As a default for chemical safety assessment, a vapour pressure value of 1E-06 Pa at 20 °C is assumed.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information