Registration Dossier

Environmental fate & pathways

Hydrolysis

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

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. At pH 7 and 12 °C (285.2 K) the half-life was 0.19 days and the rate constant 3.56 days (85.44 h).

Key value for chemical safety assessment

Half-life for hydrolysis:
0.19 d
at the temperature of:
12 °C

Additional information

Abiotoc degradation

SIKA Hardener LI was assessed in an abiotic degradation study according to EU-method C.7 and OECD guideline no. 111. Based on the results obtained hydrolysis of SIKA Hardener LI was rapid. At pH 7 and 12 °C (285.2 K) the degradation half-life was 0.19 days and the rate constant 3.56 days (85.44 h).

Abiotic degradation of SIKA Hardener LI was assessed in solutions of different pH values. Hydrolysis was most rapid in acidic environment (pH 4) and high temperature compared to basic environment (pH 9) and low temperature:

pH, t1/2 at 15°C 25°C 35°C

4, < 5 min < 5 min < 5 min

7, 111 min 99 min 86 min

9, 105 hours 85 hours 62 hours

Due to the small number of microorganisms present in the test mixtures (5-25 microorganisms/ml test mixture), there was a very low possibility of microbial decomposition. Based on the above results a potential for chemical decomposition (hydrolysis) is indicated.

The degradation products following hydrolysis are 2,2-dimethyl-3-oxopropyl dodecanoate (CAS # 102985-93-3) and 5-amino-1,3,3-trimethyl-cyclohexanemethylamine (CAS # 2855-13-2).