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Environmental fate & pathways

Phototransformation in air

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Description of key information

Phototransformation in air is not relevant due to vapour pressure (< 1 Pa at 20 °C)

Key value for chemical safety assessment

Additional information

No experimental studies investigating the phototransformation in air of OPP (CAS No. 90-43-7) are available. Based on a QSAR calculation using AOPWIN v1.92, OPP is susceptible to indirect photodegradation in air (Beiell, 2004). The estimated half-life for the reaction with OH-radicals is 0.6 days (24h day; OH-concentration: 0.5E+06 OH/cm3). However, photodegradation is not expected to be an important environmental fate process since OPP is not expected to evaporate into the atmosphere due to its low vapor pressure of < 1 Pa at 20 °C. As this study is not a standard information requirement in REACh and there is no indication from the Chemical Safety Assessment (CSA) on the need to investigate further the fate and behaviour of the substance (Annex X requirement), no further testing is considered necessary for the test substance.