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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
09/09/2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 Pa

Vapour pressure of the test item at 20ºC and 25 ºC was calculated on the basis of equation: log (p) = f (1/t) = a-b/(t+273.15) where: p – vapour pressure in Pa, t – temperature in ºC, obtained for four measurement points: 110.1 ºC, 114.8ºC, 119.1ºC and 123.7ºC.

Table 1. Vapour pressure of the test item.

Test sample

Vapour

pressure at 20ºC

Vapour pressure at 25ºC

Test item

 1.41E-8Pa

4.94E-8Pa
Conclusions:
The vapour pressure of the test item is 1.41E-8 Pa at 20ºC and 4.94E-18 Pa at 25ºC.
Executive summary:

The study of the vapour pressure using effusion method was performed in accordance with the method EU A4 - Knudsen cell, under GLP conditions. The apparatus used, NETZSCH Jupiter STA 449C, makes possible to determine vapour pressure in the range from 10-15 Pa to 500 Pa. The method is based on the estimation of the test substance mass flowing out the Knudsen cell per unit of time, through a micro-orifice under ultra-vacuum conditions. The vapour pressure was calculated by applying the Hertz-Knudsen relation with Clausing correction factor "f" that depends on parameters of the apparatus: on the ratio of orifice length to orifice radius. The vapour pressure of the test item was found to be 1.41E-8 Pa at 20ºC and 4.94E-8 Pa at 25ºC.

Description of key information

Key study. Method according to EU A.4, GLP study. The vapour pressure of the test item is 1.41E-8 Pa at 20ºC and 4.94E-8 Pa at 25ºC.

Key value for chemical safety assessment

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

Additional information