Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Hydrolysis

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Hydrolysis: Half life - 
at ph 4: 1.43 minutes at 20 deg C; 2.04 minutes at 30 deg C and 0.692 minutes at 50 deg C.
at ph 7: 1.90 minutes at 20 deg C; 1.26 minutes at 30 deg C and 0.327 minutes at 50 deg C.
at ph 9: 1.27 minutes at 20 deg C; 1.18 minutes at 30 deg C and 0.233 minutes at 50 deg C.

Key value for chemical safety assessment

Half-life for hydrolysis:
1.9 min
at the temperature of:
20 °C

Additional information

Hydrolysis as a function of pH has been investigated in accordance with OECD/EU test methods. 4-MHHPA was found to be highly unstable in aqueous media at pH 4, 7 and 9 and temperatures of 20, 30 and 50 °C.