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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:
18 Apr - 10 May 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
23 March 2006
Deviations:
not specified
GLP compliance:
yes
Remarks:
OECD Principles of Good Laboratory Practice, November 26, 1997.
Type of method:
gas saturation method
Key result
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
0.63 Pa
Key result
Test no.:
#2
Temp.:
35 °C
Vapour pressure:
2.25 Pa
Key result
Test no.:
#3
Temp.:
45 °C
Vapour pressure:
4.58 Pa

Test Results - Individual

The vapor pressure results at each test temperature are shown below.

Test Temperature (°C)

Flow rate (mL/min)

Vapor pressure (Pa), measured

Vapor pressure (Pa), Average

25

20

0.616

 

0.630

25

30

0.621

25

40

0.652

35

20

2.16

 

2.25

35

30

2.21

35

40

2.39

45

20

4.17

 

4.58

45

30

4.84

45

40

4.72

Test Result - Final

The vapor pressure of test item is 0.683 Pa (25 °C). This is the interpolated value (at 25 °C) from the liner regression equation from plot of log P vs. 1/T, where P is vapour pressure and T is temperature.

It is considered that the carrier gas was sufficiently saturated with the test item at each flow rate because three measured values at each temperature were very consistent. It is also considered that the measured vapor pressure was well-correlated to the test temperature because the regression equation obtained by plotting the logarithm of the vapor pressure (Log P) versus the reciprocal number of test temperature (1/T) was a straight line. Therefore, it is concluded that the test results are acceptable.

Description of key information

Vapor pressure is 0.683 Pa at 25 °C (OECD 104, gas saturation method).

Key value for chemical safety assessment

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

Additional information