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EC number: 939-487-8 | CAS number: -
Henry's Law constant
Administrative data
Link to relevant study record(s)
Description of key information
Henry's Law Constant: Calculated HLC at environmental temperature (12°C): >3.50E+05 Pa m3mol-1.
Key value for chemical safety assessment
Additional information
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 solubility (WS).
HLC = (VP x MW)/WS
Where MW is molecular weight.
Constituent |
Predicted water solubility (mg/l) |
Predicted Vapour pressure (Pa) |
Molecular Weight |
Henry's Law Constant at 25°C (Pa m3mol-1) |
Henry's Law Constant at 12°C (Pa m3mol-1) |
Major linear constituents |
|||||
1 |
4.90E-05 |
9.60E-02 |
372.76 |
7.30E+05 |
3.50E+05 |
2 |
4.60E-10 |
1.10E-04 |
583.15 |
1.39E+08 |
6.66E+07 |
3 |
3.70E-15 |
4.50E-07 |
793.53 |
9.65E+10 |
4.62E+10 |
4 |
2.82E-20 |
2.50E-11 |
1003.91 |
8.90E+11 |
4.26E+11 |
5 |
2.04E-25 |
1.80E-13 |
1214.29 |
1.07E+15 |
5.12E+14 |
Minor linear constituents |
|||||
6 |
3.60E-44 |
7.00E-15 |
1424.68 |
2.77E+32 |
1.33E+32 |
7 |
4.94E-51 |
9.00E-16 |
1635.06 |
2.98E+38 |
1.43E+38 |
Minor cyclic constituents |
|||||
C3 |
5.89E-19 |
3.10E-09 |
631.15 |
3.32E+12 |
1.59E+12 |
C4 |
2.61E-25 |
4.10E-13 |
841.53 |
1.32E+15 |
6.32E+14 |
C5 |
1.09E-31 |
6.90E-17 |
1051.91 |
6.66E+17 |
3.19E+17 |
C6 |
4.33E-38 |
3.10E-20 |
1262.29 |
9.04E+20 |
4.33E+20 |
C7 |
1.68E-44 |
9.30E-23 |
1472.68 |
8.15E+24 |
3.90E+24 |
The calculated HLC value for all constituents of phenyl silsesquioxanes at environmental temperature (12°C) is high: >3.5E+5Pa m3mol-1.
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