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PBT assessment

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PBT assessment: overall result

PBT status:
the substance is not PBT / vPvB

Rosin ester substances consist of esters of rosin, and non-esterified resin acids. The rosin esters can be mono-, di-, tri- or tetra-esters depending on the alcohol and the production process. Methanol can form mono-esters, ethylene glycol, diethylene glycol and triethylene glycol can form mono- and di-esters, glycerol can form mono-, di- and tri-esters and pentaerythritol can form mono-, di-, tri- and tetra-esters. In each case, the esterification reaction results in a UVCB containing esters with varying numbers of ester bonds, formed by the reaction of the various resin acids with the alcohol.

In a Proposal for Amendment to the Draft Decision Letter (2017), the MSCA (Netherlands) stated that ‘as pentaerythritol has a larger structure (containing more functional groups) compared to glycerol, we expect that HRPE will be more persistent and bioaccumulative compared to HRGE’. Although the structure of pentaerythritol mono-esters is larger, the available QSAR results show that both glycerol and pentaerythritol mono-esters are likely to behave in a similar manner in the environment, and in fact testing the glycerol mono-esters could potentially be worst case. Based on these QSAR results, and the fact that a sample with a higher percentage of mono-ester constituents can be prepared for the glycerol mono-ester, testing the glycerol mono-ester and reading across to the pentaerythritol mono-ester is justified.

Please refer to the 'Additional information' section for the persistence assessment.