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EC number: 221-906-4
CAS number: 3277-26-7
No soil simulation test data are available for 1,1,3,3-tetramethyldisiloxane
(H2-L2). However, hydrolysis data indicate that this substance
quickly hydrolyses in contact with water; the intitial step is the hydrolysis
of the siloxane (Si-O-Si) group to form dimethylsilanol, with subsequent
hydrolysis of the Si-H bond to form dimethylsilanediol.
Soil simulation studies, which are considered reliable, are available
for dimethylsilanediol (Lehmann et al. (1994), Lehmann et al.
(1998), Sabourin et al. (1996a and b)).
These studies were conducted according to generally accepted scientific
principles, and are used as weight of evidence that degradation in soil
does occur but not to a significant extent. Initial rates of soil
degradation from these studies are considered to be the data of most
use, and most representative of field conditions, as rates tended to
slow over the course of the experiments. Initial rates of degradation
ranged from 0.16 to 6.8% per month. The decrease in rates of degradation
over the course of the experiments may be due to some form of binding of
organosilane compounds to soil, as indicated by HPLC analysis of
HCl-extractable fractions from the soil in some of the studies.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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