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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Classification & Labelling & PBT assessment

PBT assessment

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Administrative data

PBT assessment: overall result

(R)-2-(4-chloro-2-methylphenoxy)propionic acid
Type of composition:
legal entity composition of the substance
State / form:
solid: particulate/powder
Reference substance:
(R)-2-(4-chloro-2-methylphenoxy)propionic acid
PBT status:
the substance is not PBT / vPvB


The substance is not considered to be P/vP in view of the available study results on biodegradability. The substance attained 81% degradation in 10 days and can therefore be considered readily biodegradable.


The substance is not considered to be B/vB in view of the available data on Log Pow that are available. Three independent studies are available, which assess the partition coefficient of the substance. In all cases, the Log Pow obtained was well below 4.5 (Log Pow at pH 7: -0.19, -0.391, -0.23, respectively)


The substance is considered to be toxic since EC10/ NOECs < 0.01 mg/L have been obtained during chronic ecotoxicity studies with aquatic organisms.

Overall conclusion

The substance does not fulfil the P/vP or B/vB criteria, but does fulfil the T criteria. Therefore, the substance is not considered PBT or vPvB.