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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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


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Description of key information

Half-life greater then one year at 25 °C and pH values of 4, 7, 9 

Key value for chemical safety assessment

Half-life for hydrolysis:
1 yr
at the temperature of:
25 °C

Additional information

Read across substance (Similar substance 01) undergoes slow hydrolysis, with a half-life greater then one year at 25 °C and pH values of 4, 7, 9. At 50°C and after 2.4 hours only around 1% of the sample was hydrolysed at pH 4, 7, 9.

Therefore, hydrolytic degradation of Direct Red 81 is unlikely given that the abovementioned tests on simila substance 01 indicate the lack of hydrolysis under any conditions.