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EC number: 700-071-4
CAS number: 932742-30-8
SIKA Hardener LI was assessed in a closed bottle test over a period of 28 days, according to OECD guideline 301 D and the EU method C.4-E. SIKA Hardener LI was ready biodegradable, reaching a mean of 63.4 % after 28 days, however, degradation failed the 10-day window.Data from the hydrolysis products indicate that 2,2-Dimethyl-3-lauroyloxy-propanal is readily biodegradable, whereas 3-aminomethyl-3,5,5-trimethylcyclohexylamine is not readily biodegradable (see ECHA dissemination webpage).
In a weight of evidence approach the
biodegradation data form the parent molecule and the two primary
hydrolysis products were assessed:
The parent substance SIKA Hardener LI was
assessed in a closed bottle test over a period of 28 days, according to
OECD guideline 301 D and EU method C.4-E. Under the test conditions
biodegradation of SIKA Hardener LI reached a mean of 63.4 % after 28
days, based on ThODNO3. However the pass level of 60 % was not reached
within a 10-day period. Therefore, the test item was considered ready
biodegradable failing the 10 day window. The correspondingdegradation
rate was calculated to be 7.70E‑06 d-1or 3.210E‑07 h.
The hydrolysis product 2,2 -Dimethyl-3
-lauroyloxy-propanal was tested using a test item concentration
corresponding to 20 mg organic carbon/L (nominal) in test medium
following OECD 301B and EU-Guideline C.4-C. Aniline was chosen as
reference item. Activated sludge was used as inoculum (concentration in
the test 25 mg drymatter/L). The test was left running for 28 days. All
validity criteria were met. Degradation of the reference item was 75 %
after seven days. The degradation of test item at end of the test was 91
%. Therefore the test item was considered to be readily biodegradable.
The second hydrolysis product Isophorone
diamine (CAS 2855 -13 -2) proved to be not readily biodegradable in a
study conducted according to EU method C4 A (8 % degradation after 28 d,
see ECHA dissemination webpage).
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