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EC number: 252-161-3
CAS number: 34708-08-2
[triethoxy(3-thiocyanatopropyl)silane]: Not relevant
[(3-thiocyanatopropyl)silanetriol]: pKa approximately 10
requirement to test the substance for dissociation constant is waived
because there are no ionisable groups present in the molecule that are
expected to ionize within an environmentally relevant pH range. However,
in contact with water, the substance hydrolyses moderately. The
hydrolysis products in this case are (3-thiocyanatopropyl)silanetriol
are no reliable measured data for the dissociation constant of
(3-thiocyanatopropyl)silanetriol. The typical dissociation constants for
the hydroxyl protons of silanetriols are available from studies in other
silanetriols. It is appropriate to read-across dissociation constant
data for (3-thiocyanatopropyl)silanetriol from phenylsilanetriol. This
suggests that silanols are not expected to undergo significant
dissociation within the range of pH relevant in the environment or in
has a measured first dissociation constant ca.10 in a reliable study
using a relevant test method.
Additional information is given in a supporting report (PFA 2013b)
attached in Section 13.
PFA (2013b). Peter Fisk
Associates, Dissociation constant Analogue report. PFA.300.001.001
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