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EC number: 479-930-8
CAS number: 613222-52-9
To assess the hydrolysis behaviour of SIKA
Hardener LH a read-across approach was applied using data from the
structural analogue substance SIKA Hardener LI, with both substances
sharing comparable hydrolytic properties.
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 degradation half-life was
0.19 days and rate constant 3.56 days (85.44 h).
a biodegradation study (MITI, 2011), the test substance Sika Hardener LH
was completely hydrolyzed to 2,2-dimethyl-3-oxopropyl dodecanoate and
hexamethylenediamine. These converted products were biodegraded. The
percentage (average) of biodegradation by BOD was 91 % after 28 days.
Further, the test substance is considered to be readily biodegradable.
Due to the immediate hydrolysis of the test
item upon contact with water, experimental determination of the
adsorption coefficient was technically not feasible. Instead,
experimental determination of the adsorption coefficient was replaced by
a theoretical based evaluation. The log Koc value of the test item was
calculated to be = 9.535 using the MCI method (KOCWIN v2.00).Based
on this result, adsorption of the test item to solid soil phase is
The study does not need to be conducted as
from experience in handling and use it is very unlikely that direct and
indirect exposure of the aquatic compartment occurs, as the substance
rapidly hydrolysis in contact with water. In addition, based on the very
high predicted log Pow of over 10 (14.22 as estimated by EPIWIN), the
substance has a very low potential to pass biological membranes and
thus, will not be easily bioavailable.
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