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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:
September 13 - September 14, 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Temp.:
20 °C
Vapour pressure:
< 0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
< 0 Pa
Temp.:
50 °C
Vapour pressure:
< 0.001 Pa

The vapour pressure was measured in the temperature range of 70 °C to 110°C. The measured vapour pressures at the corresponding temperatures are listed in the table. After the measurement the test item remained visually unchanged. No mass loss occurred.

 

Table 1: Measured vapour pressures and corresponding temperatures

Temperature /°C

Vapour pressure / hPa

70

1.1E-5

80

(4.6E-6)*

90

(1.6E-6)*

100

(2.0E-6)*

110

(3.9E-7)*

* below the detection limit of 1E-5 hPa

 

For an extrapolation to lower temperatures the Antoine equation was used. This is a conservative estimation of the vapour pressure of the test item for the listed temperatures. In order to further ensure a conservative approach the vapour pressures were rounded up to the next order of magnitude in order to obtain final upper limit values for the vapour pressure.

 

Table2 : Final vapour pressures

T/°C

p/hPa

p/Pa

20

< 1E-7

< 1E-5

25

< 1E-7

< 1E-5

50

< 1E-5

< 1E-3

 

Conclusions:
The vapour pressure of the test item was determined to be < 1E-5 Pa (20 °C), < 1E-5 Pa (25 °C) and < 1E-3 Pa (50 °C).
Executive summary:

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. Since the vapour pressure measurements did not yield vapour pressures sufficiently high to extrapolate to 20, 25 and 50 °C these values were estimated according to the Antoine equation. Based on the highest measured vapour pressure at 70 °C (vapour pressure: effusion method), the following upper limit vapour pressure values were calculated: < 1E-5 Pa (20 °C), < 1E-5Pa (25 °C) and < 1E-3Pa (50 °C).

Description of key information

Based on the highest measured vapour pressure at 70 °C (vapour pressure: effusion method), the following upper limit vapour pressure values were calculated: < 1E-5 Pa (20 °C), < 1E-5Pa (25 °C) and < 1E-3Pa (50 °C).

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. Since the vapour pressure measurements did not yield vapour pressures sufficiently high to extrapolate to 20, 25 and 50 °C these values were estimated according to the Antoine equation. Based on the highest measured vapour pressure at 70 °C (vapour pressure: effusion method), the following upper limit vapour pressure values were calculated: < 1E-5 Pa (20 °C), < 1E-5Pa (25 °C) and < 1E-3Pa (50 °C).