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Environmental fate & pathways

Hydrolysis

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Description of key information

In a weight of evidence approach, based on data from method development and data from a structural analogue, it can be shown that the DT50 of Sika Hardener LG is far below 12 hours. The degradation products following hydrolysis are the aldehyde 2,2-dimethyl-3-oxopropyl dodecanoate (CAS # 102985-93-3) and the amine 2-(2-Aminoethoxy)ethanol (CAS # 929-06-6). 

Key value for chemical safety assessment

Additional information

No state of the art hydrolysis study is available for Sika Hardener LG. This endpoint is not required for a tonnage band of 1-10 t/a, but supporting data are provided to justify waivers for physical/chemical endpoints like water solubility.

In a weight of evidence approach data from the analytical method development with Sika Hardener LG and a state of the art study with the analogous substance Sika Hardener LI is presented.

Analytical determination of test item is technically not feasible due to the fast hydrolysis. The validation report (LAB, 2009) shows, that only 1 % of nominal concentration of Sika Hardener LG could be detected in ISO medium after 47 min. In OECD medium 67 % of nominal concentration was detected after 44 min. The degradation products following hydrolysis are the aldehyde 2,2-dimethyl-3-oxopropyl dodecanoate (CAS # 102985-93-3) and the amine 2-(2-Aminoethoxy)ethanol (CAS # 929-06-6).

The statement of fast hydrolysis based on the validation report is supported by a read across approach from a full hydrolysis study (Laky, 2009) that was performed with other structural analogue Sika Hardener LI. Both substances are aldimines sharing the same aldehyde component (2,2-Dimethyl-3-lauroyloxy-propanal, CAS 102985-93-3) and only differ in the amine component. Data from the OECD toolbox support the use of data from Sika Hardener LI also as read across for Sika Hardener LG (see attachment in section 13).

Sika Hardener LI was assessed in an abiotic degradation study, according to EU-method C.7 and OECD guideline no. 111. Hydrolysis of Sika Hardener LI was most rapid in acidic environment (pH 4) and high temperature compared to basic environment (pH 9) and low temperature. The DT50 at pH 7 25°C and 15°C and was 99 min and 111 min, respectively.

In conclusion, it can be stated that the half-life of Sika Hardener LG is by far below 12 hours.