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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:
Experimental start date 22 March 2018. Experimental completion date 27 March 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
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
25 °C
Vapour pressure:
0.03 Pa

Results

The results from Runs 1 to 3 are detailed in Tables 1 to 3, with plots of log10Vp versus 1/T in Figure 1.  A summary is shown below:

Run 1 Run 2 Run 3
Correlation:  -0.96 -0.9728 -0.9623
Slope: -2266 -2769 -2226
Intercept: 6.062 7.508 5.945
Log Vpat 25°C: -1.54 -1.78 -1.52
Vp(Pa) at 25°C: 2.9 × 10-2 1.7 × 10-2 3.0 × 10-2

The mean vapour pressure was 2.5 × 10-2 Pa at 25°C.

A visual assessment of the sample following testing confirmed that the test item had not undergone any changes.

Table 1       Determination of the vapour pressure of Dihexyl Fumarate (EC 242-833-4) (Run 1)

Temperature (°C) Mass difference (µg) Condensation rate (µg/s) Vapour pressure (Pa) a Corrected vapour pressure (Pa) 1/Temperature (1/K) Log vapour pressure
From mass difference From condensation From mass difference From condensation
31.5 23.56 0.722 0.03885 0.0287 0.54 0.0532 0.0532 0.00328 -1.27
36 28.53 0.634 0.04704 0.0254 0.425 0.05974 0.05974 0.00323 -1.22
41 33.72 0.753 0.0556 0.03039 0.429 0.0708 0.0708 0.00318 -1.15
45 37.94 0.363 0.06255 0.01476 0.211 0.06993 0.06993 0.00314 -1.16
49.5 48.64 0.385 0.08019 0.01574 0.179 0.08806 0.08806 0.0031 -1.06
55 69.39 - 0.1144 - - 0.1144 - 0.00305 -0.94
60.5 108.08 - 0.1782 - - 0.1782 - 0.003 -0.75
65 140.51 0.94 0.23166 0.03935 0.157 0.25133 0.25133 0.00296 -0.6
70 194.55 2.72 0.32076 0.11471 0.303 0.37811 0.37811 0.00291 -0.42

Table 2       Determination of the vapour pressure of Dihexyl Fumarate (EC 242-833-4) (Run 2)

Temperature (°C) Mass difference (µg) Condensation rate (µg/s) Vapour pressure (Pa) a Corrected vapour pressure (Pa) 1/Temperature (1/K) Log vapour pressure
From mass difference From condensation From mass difference From condensation
25.5 11.67 0.136 0.01925 0.00533 0.243 0.02191 0.02191 0.00335 -1.66
30 14.7 0.29 0.02423 0.01149 0.383 0.02998 0.02998 0.0033 -1.52
35.5 16.65 0.314 0.02744 0.01256 0.372 0.03372 0.03372 0.00324 -1.47
41 19.46 0.251 0.03208 0.01011 0.272 0.03713 0.03713 0.00318 -1.43
46 27.02 0.2 0.04455 0.00812 0.167 0.04861 0.04861 0.00313 -1.31
51 43.45 0.101 0.07164 0.00414 0.056 0.07371 0.07371 0.00308 -1.13
55.5 70.69 - 0.11654 - - 0.11654 - 0.00304 -0.93
61.5 97.28 0.559 0.16038 0.02329 0.135 0.17202 0.17202 0.00299 -0.76
66 131.86 1.459 0.2174 0.06119 0.247 0.248 0.248 0.00295 -0.61
70.5 190.23 3.131 0.31363 0.13215 0.348 0.37971 0.37971 0.00291 -0.42

Table 3       Determination of the vapour pressure of Dihexyl Fumarate (EC 242-833-4) (Run 3)

Temperature (°C) Mass difference (µg) Condensation rate (µg/s) Vapour pressure (Pa) a Corrected vapour pressure (Pa) 1/Temperature (1/K) Log vapour pressure
From mass difference From condensation From mass difference From condensation
31 27.67 0.259 0.04562 0.0103 0.203 0.05077 0.05077 0.00329 -1.29
36.5 32.43 0.74 0.05346 0.02966 0.434 0.06829 0.06829 0.00323 -1.17
40.5 33.4 0.649 0.05506 0.02615 0.384 0.06814 0.06814 0.00319 -1.17
45.5 39.88 0.486 0.06576 0.01977 0.261 0.07564 0.07564 0.00314 -1.12
51 52.53 0.286 0.0866 0.01173 0.127 0.09247 0.09247 0.00308 -1.03
56 77.82 - 0.1283 - - 0.1283 - 0.00304 -0.89
61 108.63 0.188 0.17909 0.00784 0.043 0.18301 0.18301 0.00299 -0.74
65.5 142.67 1.052 0.23522 0.04407 0.171 0.25726 0.25726 0.00295 -0.59
71 198.88 3.243 0.32788 0.13697 0.346 0.39637 0.39637 0.00291 -0.4
Conclusions:
The vapour pressure of Dihexyl Fumarate (EC 242-833-4) was found to be 3 × 10^-2 Pa at 25°C.

Description of key information

The vapour pressure of Dihexyl Fumarate (EC 242-833-4) was found to be 3 × 10^-2 Pa at 25°C.

Key value for chemical safety assessment

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

Additional information