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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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) = 13.3 h
Half-life for reaction with ozone (at 7E11 mol/cm³) = 24.2 h
Combined calculation result = 8.6 h

Key value for chemical safety assessment

Half-life in air:
13.3 h

Additional information

2 -EHMA does not possess UV-absorbing structures. Therefore, direct photolysis is not expected to occur to any significant degree.

While experimental data with model atmospheres exist for MMA which are broadly consistent with model data, no experimental photodegradation data exist for 2-EHMA. A model calculation using EpiWin v4.10 AOP v1.92 showed a rate constant for the reaction of 2 -EHMA with hydroxyl radicals in the atmosphere of 29.0325 E-12 cm³/molecule*sec. From this rate constant the half-life for the reaction of OH radicals with the test substance is calculated as 13.3 h.

In conclusion, after evaporation or emission to air, 2 -ethylhexyl methacrylate will be rapidly degraded by photochemical processes.