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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 values were reported as 2.15E-4 kPa (0.215 Pa) at 20°C (293.15 K) and 2.03E-2 Torr (2.706 Pa) at 25°C (298 K), for measured and calculated values, respectively.

Key value for chemical safety assessment

Vapour pressure:
0.215 Pa
at the temperature of:
293.15 K

Additional information

Vapour pressure of 1,2,4-triazole was measured using the effusion method in compliance with the OECD Guidelines for the Testing of Chemicals No. 104, and was calculated using Advanced Chemistry Development (ACD/Labs) Software V8.14. The vapour pressure values were reported as 2.15E-4 kPa (0.215 Pa) at 20°C (293.15 K) and 2.03E-2 Torr (2.706 Pa) at 25°C (298 K), for measured and calculated values, respectively.