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Physical & Chemical properties

Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2009
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Basic data given.
Reason / purpose for cross-reference:
reference to same study
Principles of method if other than guideline:
Vapour pressure measurement by the dynamic method.
GLP compliance:
no
Type of method:
dynamic method
Remarks:
under nitrogen
Temp.:
20 °C
Vapour pressure:
0.46 hPa
Remarks on result:
other: extrapolated value based on measured values
Temp.:
54.3 °C
Vapour pressure:
5 hPa

The regression of the results leads with a mean deviation of 0.13% to the following equation:

ln p (bar) = 9.5883 -3674.457/(192.52 + (t/°C))

temperature
t [°C]

pressure (exp.)
p [hPa]

pressure (calc.)
p [hPa]

dev
 [%]

30.34

1.01

1.012

-0.22

40.01

2.00

2.001

-0.07

46.13

3.00

2.998

0.07

54.30

5.00

4.998

0.25

60.03

7.00

6.992

0.11

66.44

10.01

10.027

-0.17

79.65

19.99

19.989

0.00

88.10

29.99

30.040

-0.17

99.49

49.99

50.108

-0.24

107.46

69.97

70.030

-0.09

116.49

99.97

100.190

-0.22

135.55

200.00

199.860

-0.07

147.87

299.70

299.58

0.04

164.83

499.80

499.48

0.06

176.89

699.70

698.21

0.21

191.67

1019.90

123.15

-0.32

Conclusions:
The test substance has a vapour pressure of 0.46 hPa at 20 °C.
Executive summary:

The vapour pressure of the test substance was measured by the dynamic method under nitrogen. The test substance has a vapour pressure of 0.46 hPa at 20 °C (extrapolated value based on measured values).

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
3 Jan 1986
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Basic data given: Comparable to guideline OECD TG 104.
Reason / purpose for cross-reference:
reference to same study
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
not specified
Type of method:
dynamic method
Temp.:
20 °C
Vapour pressure:
51.6 Pa

Measurement data:

MEASURED

TEMP.        PRESS.

ERROR IN PRESSURE USING EQN

% ERR                   DP1

85.097

20.17

0.208

0.04

100.763

40.27

-0.260

-0.10

117.958

79.99

-0.147

-0.12

129.092

120.19

0.018

0.02

137.435

160.13

0.075

0.12

144.061

199.05

0.079

0.16

157.326

300.40

0.107

0.32

171.455

450.45

0.041

0.18

182.172

599.70

-0.121

-0.73

 

The following Antoine Equation was fit to the measurement data:

ln(P)= A + B/(C+T)

P is in mm Hg

T is in °C

A = 16.38429

B = -3820.722

C = 200.411

The vapor pressure of the test substance

was calculated from the Antoine equation shown above.

The vapor pressure of the test substance at 20 °C is = 0.387 mm Hg (51.6 Pa)

Conclusions:
The vapour pressure of the test substance is 51.6 Pa at 20 °C.
Executive summary:

The vapour pressure of the test substance was determined similar to OECD TG 104 by the dynamic method.

The vapour pressure of the test substance is 51.6 Pa at 20 °C.

Description of key information

The vapour pressure of the test substance is 51.6 Pa at 20 °C.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test substance was determined similar to OECD TG 104 by the dynamic method.

The vapour pressure of the test substance is 51.6 Pa at 20 °C.

A supporting study from another laboratory reports a vapour pressure of 46 Pa at 20 °C measured also by the dynamic method.