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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:
2017-02-24 until 2017-03-13
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
not specified
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
Delivered by: CURRENTA GmbH & Co. OHG
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Remarks on result:
other: associated uncertainty is estimated to be lower than 10 % of the value
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: associated uncertainty is estimated to be lower than 10 % of the value
Test no.:
#3
Temp.:
55 °C
Vapour pressure:
0 Pa
Remarks on result:
other: associated uncertainty is estimated to be lower than 10 % of the value
Key result
Vapour pressure:
0 Pa
Remarks on result:
other: associated uncertainty is estimated to be lower than 10 % of the value

For every experiment (temperature), three effusion cells were used simultaneously, with effusion orifices of approx. 0.8 mm in diameter, in platinum foil with a thickness of 12.5 m. More precise values for the areas, A0, and the transmission probability factors, w0, of the effusion orifices used are given in Table below:

Cell   l/mm  A0/mm2  w0
 10 0.0125  0.499  0.9884 
 11 0.0125   0.496  0.9883 
 12 0.0125   0.532  0.9887 

Results obtained in the measurement of the vapour pressures of Phosphorothioyltris(oxybenzene-4,1-diylcarbamoyloxyethane-2,1-diyl) trisprop-2 -enoate.

Cell   m/mg  p/Pa  m/mg  p/Pa  m/mg  p/Pa
   T/°C = 119.28  t = 63h 05m 37s  T/°C = 129.23  t = 51h 26m 52s  T/°C = 139.19  t = 65h 34m 54s
 10  2.75  0.00389  3.62  0.00636  7.50  0.01047
 11  2.91  0.00415  3.84  0.00680  6.95  0.00977
 12  2.65  0.00352  4.31  0.00711  8.82  0.01156

Results to vapour pressure were determined using simplified Clapeyron-Clausius equation. Results can be determined for the temperature range from approx. 60 °C to 200 °C. Outside this temperature range, it is expected that the equation will progressively produce values that are higher than the real vapour pressure of the compound.

Conclusions:
From the results obtained in this work, in the measurement of the vapour pressures at different temperatures for a sample of Phosphorothioyltris(oxybenzene-4,1-
diylcarbamoyloxyethane-2,1-diyl) trisprop-2-enoate, the following conclusions can be drawn:
Based on the results, the vapour pressure of the compound is calculated as being equal to 3.2 x 10-6 Pa (3.2 x 10-8 mbar) at 20 °C, and 4.3 x 10-5 Pa (4.3 x 10-7 mbar) at 50 °C.
Executive summary:

The vapour pressure of Phosphorothioyltris(oxybenzene-4,1-diylcarbamoyloxyethane-2,1-diyl) trisprop-2-enoate was measured using the Knudsen effusion method (mass-loss technique), according to the guidelines OECD 104 / EU A.4. The quality of the apparatus was previously verified with the measurement of well-known reference compounds.

Experiments were performed at three temperatures between 120 °C and 140 °C. Results permit the establishment of the relation between the vapour pressure of the compound and temperature, allowing the knowledge of the vapour pressure at different temperatures.

Based on the results, the vapour pressure of the compound is calculated as being equal to 3.2 x 10-6 Pa (3.2 x 10-8 mbar) at 20 °C, and 4.3 x 10-5 Pa (4.3 x 10-7 mbar) at 50 °C.

Description of key information

Based on the results, the vapour pressure of the compound is calculated as being equal to 3.2 x 10-6 Pa (3.2 x 10-8 mbar) at 20 °C, and 4.3 x 10-5 Pa (4.3 x 10-7 mbar) at 50 °C.

Key value for chemical safety assessment

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

Additional information