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EC number: 451-620-7
CAS number: 352230-22-9
Henry's Law Constant (taken from
Constituent 1: Calculated HLC at
environmental temperature (12°C): 2.1E+04 Pa m3mol-1,
4.3E+04 Pa m3mol-1 at 25°C
Constituent 2: Calculated HLC at
environmental temperature (12°C): 2.2E+05 Pa m3mol-1,
4.5E+05 Pa m3mol-1 at 25°C
The transfer of a substance from
the water phase to the gas phase can be estimated by means of the
Henry’s Law Constant (HLC). No measured value for this parameter is
available. The HLC can be estimated for the constituents of the
substance from the ratio of the vapour pressure (VP) to the water
HLC = (VP x MW)/WS
Where MW is molecular weight.
The estimated HLC for the
constituents (taken from EUSES 2.1.2) is reported in Table 4.2.2.
Table 4.2.2: Estimated HLC for the
Predicted water solubility (mg/L)
Predicted vapour pressure (Pa)
Molecular weight (g/mol)
Henry's Law Constant at 25°C (Pa m3mol-1)
Henry's Law Constant at 12°C (Pa m3mol-1)
Constituent 1 - 3,3-Diphenylhexamethyltrisiloxane
Constituent 2 - 3,3,5,5-Tetraphenylhexamethyltetrasiloxane
on the percentage amount of each constituent in the submission
substance, the calculated water solubility and measured vapour pressure
for the whole substance and a weighted molecular weight average of
405.16 g/mol, HLC value of 1.2E+06 Pa m3mol-1 at 25°C
and 5.6E+05 Pa m3mol-1 at 12°C
were obtained for the whole substance.
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