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EC number: 700-071-4
CAS number: 932742-30-8
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).
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
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
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).
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