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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
29 April 2009 - 03 June 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study was performed according to guideline under GLP conditions.
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: vapour pressure balance
Temp.:
25 °C
Vapour pressure:
0 hPa
Remarks on result:
other: vapour pressure at 25 C was extrapolated from plot of log Pa vs. 1/K between 40 - 50 degrees C
Temp.:
50 °C
Vapour pressure:
0.002 hPa
Remarks on result:
other: The test material did not change in appearance under the conditions used in the test.

Vapour pressure was measured at temperatures between 40 - 50 C. A total of seven tests were performed. The average vapour pressure was .032 Pa (standard deviation = 0.0025). Linear regression analysis was used to calculate the vapour pressure at 25 C. The test material did not show any change in appearance during the test.

Representative data are given in Table 1. The plot is attached as Figure 1.

Table 1. Vapour Pressure Measurements at 41 - 50 C

Temperature0C

Temperature0K

Reciprocal Temperature  (1/K)

Mass Difference (µg)

Vapour Pressure (Pa)

log Pa

41

314.15

0.003183193

86.16

0.119612154

-0.922224689

42

315.15

0.003173092

94.65

0.131398449

-0.881409761

43

316.15

0.003163056

37.85

0.135840869

-0.866969549

44

317.15

0.003153082

103.24

0.14332357

-0.843682383

45

318.15

0.003143171

117.62

0.163286694

-0.787049204

46

319.15

0.003133323

123.11

0.170908221

-0.767237046

47

320.15

0.003123536

133.89

0.185873622

-0.730782238

48

321.15

0.003113810

148.77

0.206530875

-0.685015015

49

322.15

0.003104144

157.25

0.218303287

-0.660939725

50

323.15

0.003094538

168.54

0.233976700

-0.630827389

 Slope:  -3342.7

Intercept: 9.7134

R2 = 0.992

Conclusions:
The vapour pressure of the test material is 0.032 Pa at 25 C. The test material did not show transitions in physical state during testing.
Executive summary:

The vapour pressure of the test material was determined using the vapour pressure balance method following EU Method A.4 guidelines.  Measurements were made between temperatures of 40 - 50 C. A plot of log P vs 1/K was prepared from the experimental measurements and was used to calculate the vapour pressure of the test material at 25 C. The vapour pressure of the test material at 25 degrees C is  0.032 Pa. The test material did not show transitions in physical state during testing.

        

Description of key information

The vapour pressure of the test material at 25 degrees C is 0.032 Pa. The test material did not show transitions in physical state during testing (EU Method A.4).

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test material was determined using the vapour pressure balance method following EU Method A.4 guidelines.  Measurements were made between temperatures of 40 - 50 C.   A plot of log P vs 1/K was prepared from the experimental measurements and was used to calculate the vapour pressure of the test material at 25 C. The vapour pressure of the test material at 25 degrees C is  0.032 Pa. The test material did not show transitions in physical state during testing.