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EC number: 236-828-6
CAS number: 13501-76-3
(3-chloropropyl)diethoxymethylsilane and its hydrolysis product
(3-chloropropyl) methylsilanediol contain no chromophores that would
absorb visible or UV radiation so direct photolysis is not likely to be
significant. Indirect photolysis resulting from gas-phase reaction with
photo chemically-produced hydroxyl radicals may occur.
The SRC AOPWIN program(v1.92)has been used to obtain values of the
rate constantkOHfor reaction of
(3-chloropropyl)methylsilanediolwith hydroxyl radicals. This prediction
method has not been validated to assess applicability to silanes and
silanols; therefore, there is uncertainty associated with the calculated
The overall half-life in air under default conditions of hydroxyl
radical concentration was calculated using the following expressions:
kdegair(d-1) = kOH(cm3/molecule.sec)
x OH Concair(molecules/cm3) x 24 x 3600
DT50(d) = ln 2/ kdegair(d-1)
kdegair= total rate constant for
degradation in air
kOH= rate constant for reaction
with hydroxyl radicals
OH Concair= concentration of hydroxyl radicals in air
=5 x 105OH molecules/ cm3
The results are given in table 4.1.2.
Table4.1.1Results of photodegradation in air calculations
kOH (cm3 / molecule.sec)
14.6 x 10-12
6.1 x 10-12
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