Registration Dossier
Registration Dossier
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EC number: 242-560-0 | CAS number: 18765-38-3
Henry's Law constant
Administrative data
Link to relevant study record(s)
Description of key information
Calculated HLC for silanol hydrolysis product at environmental temperature (12°C): 1.0 E-06 Pa m3mol-1
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 0
- at the temperature of:
- 12 °C
Additional information
Tetrakis(2-butoxyethyl) orthosilicate hydrolyses rapidly (t1/2= 4 h at pH 7 and 25°C). The hydrolysis products are monosilicic acid and 2-butoxyethanol. Monosilicic acid exists only in dilute aqueous solutions and readily condenses at concentrations above approximately 100 - 150 mg/l as SiO2 to give a dynamic equilibrium between monomer, oligomers and insoluble polysilicic acid. These are inorganic substances with a negligible vapour pressure, and which enter natural biogeochemical cycles for silicon. Therefore, volatilisation from water is not a relevant process.
2-butoxyethanol is rapidly biodegradable.
The HLC for 2-butoxyethanol can be estimated from the ratio of the vapour pressure (VP) to the water solubility (WS).
HLC = (VP x MW) /WS
Where MW is molecular weight.
The calculated HLC value for ethanol at environmental temperature (12°C) is 0.2 Pa m3mol-1(taken from EUSES 2.1.2).
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