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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study was conducted according to ECC Testing Guideline A4 with GLP compliance.
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
not applicable
GLP compliance:
yes (incl. QA statement)
Type of method:
static method
Key result
Temp.:
ca. 20 °C
Vapour pressure:
ca. 0 Pa
Remarks on result:
other: Estimaated

The Henry constant of a substance is its partition coefficient between air and water. It may be reasonably approximated as the ratio of vapour pressure and water solubility. However, Henry's constant may not be obtained from the reported water solubility and vapour pressure because it is probable that the data relate to different components. Instead an estimate of the Henry's constant of Bisphenol F(h) from the program HENRY was obtained. The result was h= 9.6 x 10'7 Pa m3 mol'1. An estimate of the vapour pressure of pure Bisphenol F is given by (h x water solubility), and thus, for a solubility of 20 mg/l, an approximate vapour pressure is 6 x 10'8 Pa.

Conclusions:
The vapour pressure of Reaction mass of 2,2'-[methylenebis(2,1-phenyleneoxymethylene)]bis(oxirane) and 2,2'-[methylenebis(4,1-phenyleneoxymethylene)]bis(oxirane) and 2-({2-[4-(oxiran-2-ylmethoxy)benzyl]phenoxy}methyl)oxirane was calculated to be 6x10^-8 Pa.
Executive summary:

The static method was used to determine the vapour pressure of EPlKOTE 862 in the range 40°C to 70°C. These data were extrapolated to give a value of 82 Pa at 20°C, with a 95% confidence range of 60 to 111 Pa. It is highly probable that the pressure was due in the main to the minor (lower molecular weight) components of the substance or to impurities. The Henry's constant for EPlKOTE 862 may not be obtained from the water solubility and vapour pressure, because the two set of data pertain to different components. Instead, an estimated value of Henry's constant was used, with the water solubility, to give an approximate vapour pressure of Bisphenol F of 6 x 10'8 Pa. This result confirms the view that the vapour pressure of the total product is due to impurities.

Description of key information

 The vapour pressure of Reaction mass of 2,2'-[methylenebis(2,1-phenyleneoxymethylene)]bis(oxirane) and 2,2'-[methylenebis(4,1-phenyleneoxymethylene)]bis(oxirane) and 2-({2-[4-(oxiran-2-ylmethoxy)benzyl]phenoxy}methyl)oxirane was calculated to be 6x10^-8 Pa.  

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
293 K

Additional information

The vapour pressure of BPFDGE was determined by EEC Method 4A with GLP compliance. The vapour pressures for BPFDG at 20°C were calculated to be 6x10^8 Pa.

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