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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Administrative data

Link to relevant study record(s)

Description of key information

Model calculation using EpiSuite 4.10 (AOP program v1.92, US-EPA, 2008):
Half-life for reaction with hydroxyl radicals ( 0.5E6 OH/cm³) = 16.97 h
Half-life for reaction with ozone (at 7E11 mol/cm³) = 24.2 h
Combined calculation result = 10 h

Key value for chemical safety assessment

Half-life in air:
16.97 h

Additional information

The methacrylate esters do not possess UV-absorbing structures. Therefore, direct photolysis is not expected to occur to any significant degree.

Photodegradation in the atmosphere is expected to occur either by reaction with photo-chemically produced hydroxyl radicals or by reaction with ozone. For reaction with ozone an atmospheric half-life of approximately one day has been calculated for i-BMAusing EpiWin v4.10 AOP v1.92 and for the reaction with hydroxyl radicals a half life of 16.97 h was estimated.

In conclusion, after evaporation or emission to air, i-butyl methacrylate will be rapidly degraded by photochemical processes.