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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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


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Administrative data

Link to relevant study record(s)

Description of key information

The substance was classified as “not readily combustible”.

Key value for chemical safety assessment

non flammable

Additional information

The flammability of 1,2,4-triazole was assessed in 2 tests.

First experiment according to the UN Test Procedure N.1. When approached by the ignition flame, the test substance melted; however, it did not burn down or burn up. As such, no further testing was required, and the substance was classified as “not readily combustible” under CLP classifications.

Second experiment the test item was heated for two minutes with the flame of a teclu burner. The test item started to melt immediately. No propagation of combustion was noticed. Since propagation of combustion did not occur within two minutes, the test item was classified as not highly flammable, and no determination of burning rate was necessary.

Justification for classification or non-classification