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EC number: 451-620-7
CAS number: 352230-22-9
The substance is a
multi-constituent substance with two main constituents,
Since the substance is a
multi-constituent substance; two aspects need to be considered in
relation to physicochemical properties:
1) In the context of raw material
handling and safe use, it is important to understand the properties of
the product as a whole as discussed below.
The substance is a liquid at room
temperature and pressure, with a freezing temperature of <-68°C and a
measured boiling range of 268°C to 341°C at 1013 hPa.
It has a measured relative density of 0.9929 at 20°C. The vapour
pressure of the whole substance was measured to be 0.068 Pa at 25°C,
0.26 Pa at 35°C and 0.64 Pa at 45°C. It has a calculated water
solubility value of 2.2E-05 mg/L at 20°C.
The substance is not classified
for flammability according to Regulation (EC) No. 1272/2008, on the
basis of a measured flash point of 141°C and a measured boiling range of
268°C to 341°C. It has a measured auto-ignition
temperature of 395°C at 968 mBar (968 hPa) and is not explosive and not
oxidising on the basis of chemical structure.
2) For the purposes of assessing
environmental fate and behaviour, individual constituents may behave
independently of each other. It is therefore essential to consider the
properties of individual constituents, and whole property data may have
no real scientific meaning or significance. However, it has been
concluded for the submission substance, that the Chemical Safety
Assessment (CSA) should be conducted as if the substance is a
mono-constituent substance because of the similar physicochemical
properties of the constituents. The details considered in reaching the
conclusion is in Table 1.3.2.
The predicted key physicochemical
properties of the individual constituents are shown in Table 1.3.2.
Table 1.3.2: Predicted key
physicochemical properties of constituents of the substance
Molecular weight (g/mol)
Vapour pressure (Pa ) at 25°C
log Kow at 20°C
Water solubility (mg/L) at 20°C
In contact with water, the
constituents react slowly with predicted hydrolysis half-lives below:
Constituent 1: >1.9 hours at pH 4,
>200 hours at pH 7 and >2.0 hours at pH 9 and 20-25°C
Constituent 2: >3.6 hours at pH 4,
>630 hours at pH 7 and >5.3 hours at pH 9 and 20-25°C.
The products of the hydrolysis
reaction for both constituents are trimethylsilanol and
Therefore, since physicochemical
properties of the constituents are similar, (low vapour pressure, very
high log Kow, very low solubility in water
(see Table 1.3.2) and slow hydrolysis in contact with water),
environmental and human health exposure assessments were conducted as if
the substance is a mono-constituent substance.
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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