Registration Dossier
Registration Dossier
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EC number: 282-775-7 | CAS number: 84418-63-3
Endpoint summary
Administrative data
Description of key information
Additional information
There are no data available investigating the biodegradability and adsorption of 3,5,5 trimethylhexanoic acid, mixed esters with dipentaerythritol (CAS 84418-63-3). In order to fulfil the standard information requirements set out in Annex VII, 8.5, in accordance with Annex XI, 1.5, of Regulation (EC) No 1907/2006, read-across from structurally related substances was conducted. In accordance with Article 13 (1) of Regulation (EC) No 1907/2006, "information on intrinsic properties of substances may be generated by means other than tests, provided that the conditions set out in Annex XI are met.”
Having regard to the general rules for grouping of substances and read-across approach laid down in Annex XI, Item 1.5, of Regulation (EC) No 1907/2006 whereby substances may be predicted as similar provided that their physicochemical, toxicological and ecotoxicological properties are likely to be similar or follow a regular pattern. As a result of structural similarity, the substances 3,5,5-trimethylhexanoic acid hexaester with dipentaerythritol (CAS 84418-63-3) and dipentaerythritol ester with fatty acids, C5 and C9iso (CAS 647028-25-9) are used as source substances.
The above mentioned substances are considered to be similar on the basis of the structural similarity resulting in similar properties and/or activities. The available endpoint information for biodegradation and/or adsorption is used to predict the same endpoints for 3,5,5 trimethylhexanoic acid, mixed esters with dipentaerythritol (CAS 84418-63-3). A detailed analogue approach justification is provided in the technical dossier (see IUCLID Section 13).
3,5,5 trimethylhexanoic acid, mixed esters with dipentaerythritol (CAS 84418-63-3) and the source substances are characterized by a similar structure with all substances representing polyol ester consisting of the same alcohol moiety (i.e. dipentaerythritol) and a similar fatty acid chain length (C5-C9 and C9iso). All substances show a similar environmental behavior based on the relevant physico/chemical and environmental fate properties.
For the target substance, abiotic degradation is not a relevant pathway. Since the substance is not likely to be present in the atmosphere based on the low vapour pressure (< 1 Pa at 20 °C), indirect photolysis is not to be expected. Abiotic hydrolysis is not relevant, since the substance is poorly water soluble (< 10 µg/L, 20 °C).
Biodegradation in aquatic and terrestrial environment is expected to be low based on read across to 3,5,5-trimethylhexanoic acid hexaester with dipentaerythritol (CAS 84418-63-3).
Evaporation into air and the transport through the atmospheric compartment is not expected due to the low vapour pressure. Considering the low water solubility (< 10 µg/L, 20 °C) of 3,5,5 trimethylhexanoic acid, mixed esters with dipentaerythritol and high adsorption properties, the main compartment for environmental distribution is expected to be soil and sediment. The Guidance on information requirements and chemical safety assessment, Chapter R7.b (ECHA, 2014) states that once insoluble chemicals enter a standard STP, they will be extensively removed in the primary settling tank and fat trap and thus, only limited amounts will get in contact with activated sludge organisms. Nevertheless, once this contact takes place, these substances are expected to be removed from the water column to a significant degree by adsorption to sewage sludge (Guidance on information requirements and chemical safety assessment, Chapter R.7a, (ECHA, 2014). Thus, discharged concentrations of this substance (if at all) into the aqueous/sediment and soil compartment are likely to be low.
Moreover, bioaccumulation of the target substance is assumed to be low based on information gathered on the absorption of the substance by aquatic organisms and the environmental behavior, in combination with QSAR-estimations.
Conclusion for read across
Based on the similar structures, similar physico-chemical properties and available data on the environmental fate on 3,5,5 trimethylhexanoic acid, mixed esters with dipentaerythritol (CAS 84418-63-3) and the source substances 3,5,5-trimethylhexanoic acid hexaester with dipentaerythritol (CAS 84418-63-3) and Dipentaerythritol ester with fatty acids, C5 and C9iso (CAS 647028-25-9) it can be concluded that all substances show a similar environmental fate profile. In consequence data from both source substances can be used to read across to 3,5,5 trimethylhexanoic acid, mixed esters with dipentaerythritol (CAS 84418-63-3).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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