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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Phototransformation in water

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Administrative data

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Description of key information

Monopropylene glycol undergoes reactions with hydroxyl radicals in water. The half life of monopropylene glycol due to this reaction, based on an OH radical concentration of 10E-17 mol/litre is 2.3 years. The overall rate constant is 0.94x10E9 litre/molecule.sec.

Key value for chemical safety assessment

Additional information

The calculated half life of monopropylene glycol in water is 2.3 years with an OH radical concentration of 10-17 mol/litre (Anbar, 1967). The indirect photolysis of monopropylene glycol by photochemically-produced hydroxy radicals is slow in water.