Registration Dossier

Physical & Chemical properties

Vapour pressure

Currently viewing:

Administrative data

Link to relevant study record(s)

Referenceopen allclose all

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
no guideline available
Principles of method if other than guideline:
The transpiration method (also called gas saturation) involves passing a steady stream of an inert gas over or through the sample, which is held at constant temperature.
GLP compliance:
no
Type of method:
gas saturation method
Temp.:
21 °C
Vapour pressure:
2.84 Pa

An equation is given to calculate the vapor pressure as a function of temperature:

lnP = 337.7/R-97276.2/RT-94.8*ln(T/298.15)/R with R= 8.314472 SI unit and T in in Kelvin. In this equation, P is in Pascals.

Conclusions:
The vapour pressure of the substance is 2.5 Pa at 20 °C.
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
no guideline available
Principles of method if other than guideline:
The transpiration method (also called gas saturation) involves passing a steady stream of an inert gas over or through the sample, which is held at constant temperature.
GLP compliance:
no
Type of method:
gas saturation method
Temp.:
20 °C
Vapour pressure:
2.53 Pa

An equation is given to calculate the vapor pressure as a function of temperature:

ln(P)=39.9 -11475.0/T-11.4*ln((T/298.15) with T expressed in Kelvin. In this equation, P is in Pascals.

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline available
Principles of method if other than guideline:
The method is described in the following article: Hwang, S. M. et al. Isothermal vapor-liquid equilibria for mixtures of 4-methoxyphenol, catechol, and p-cresol. Fluid Phase Equilib. 2000, 172, 183 - 196.
GLP compliance:
no
Type of method:
static method
Temp.:
100 °C
Vapour pressure:
1 260 Pa

An equation is given to calculate the vapor pressure as a function of temperature:

lnP = 17.9128 -7255.259/(T+37.1978) with T expressed in Kelvin and P expressed in kPa.

Description of key information

The vapour pressure of the substance has been determined for two temperature ranges: 20 to 60 °C and 80 to 170 °C, leading to the modelization (equations) of this end point on these two ranges.

Key value for chemical safety assessment

Vapour pressure:
2.5 Pa
at the temperature of:
20 °C

Additional information