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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Description of key information

A hydrolysis study on 44PD  revealed that 44PD hydrolyses at pH4, pH7 and pH9. Additionally, the kinetic behaviour of the hydrolysis products detectable by HPLC-UV analysis were monitored and reported for pH 7 and pH 9.    Results are DT50 (20 °C, pH 4): approx. 230 hours; DT50 (50 °C, pH 4): approx. 30 hours; Half-life-time (20 °C, pH 7): t(1/2) = 5.3 hours; DT50 (20 °C, pH 9): approx. 1.5 hours. The final hydrolysis products are p-benzoquinone, p-hydroquinone and 1-methyl-propylamine (sec-butylamine). 

Key value for chemical safety assessment

Half-life for hydrolysis:
5.3 h
at the temperature of:
20 °C

Additional information