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EC number: 202-009-7 | CAS number: 90-66-4
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- May 29, 2017 to May 31, 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- European Community (EC), EC No. 761/2009, Part A: Methods for the Determination of Physico-Chemical Properties, Guideline A.4: “Vapour Pressure”, Official Journal of the European Union No. L220, August 24, 2009
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- Organisation for Economic Co-operation and Development (OECD), OECD Guidelines for the Testing of Chemicals No. 104: “Vapour Pressure”, March 23, 2006
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: isothermal thermogravimetry
- Specific details on test material used for the study:
- No further details specified in the study report.
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.001 Pa
- Remarks on result:
- other: This value however is expected to be overestimated, because it was deter-mined from the molten material.
- Conclusions:
- The isothermal thermogravimetric effusion method was applied for the determination of the vapour pressure of 6,6´-di-tert-butyl-2,2`-thiodi-p-cresol.
A value of the vapour pressure of the test item was determined using the data obtained between 140 °C and 170 °C. The vapour pressure of the test item was calculated (mean of three determinations) to: 6.09E-4 Pa at 20 °C.
This value however is expected to be overestimated, because it was determined from the molten material. - Executive summary:
The purpose of the study was to determine the vapour pressure of the 6,6´-di-tert-butyl-2,2`-thiodi-p-cresol using the isothermal thermogravimetric effusion method. The evaporation rates of the test item at elevated temperatures and ambient pressure were determined by monitoring the weight loss over the time.
The isothermal thermogravimetric effusion method was applied for the determination of the vapour pressure of 6,6´-di-tert-butyl-2,2`-thiodi-p-cresol.
A value of the vapour pressure of the test item was determined using the data obtained between 140 °C and 170 °C. The vapour pressure of the test item was calculated (mean of three determinations) to: 6.09 × 10-4Pa at 20 °C.
This value however is expected to be overestimated, because it was determined from the molten material.
Reference
Weight loss of the test item in the temperature range of 120 °C to 170 °C
Temperature [°C] |
1/T [K] |
1000/T [K] |
Weight loss [μg/min] |
VT [g/cm2h] |
Log VT |
120 120 120 |
0.00254 0.00254 0.00254 |
2.54453 2.54453 2.54453 |
8.678 11.380 7.166 |
n.d. |
|
130 130 130 |
0.00248 0.00248 0.00248 |
2.48139 2.48139 2.48139 |
9.4941 1.140 8.709 |
||
140 140 140 |
0.00242 0.00242 0.00242 |
2.42131 2.42131 2.42131 |
15.680 15.500 14.450 |
0.001882 0.001860 0.001734 |
-2.725473 -2.730487 -2.760951 |
150 150 150 |
0.00236 0.00236 0.00236 |
2.36407 2.36407 2.36407 |
24.590 25.410 24.600 |
0.002951 0.003049 0.002952 |
-2.530060 -2.515814 -2.529884 |
160 160 160 |
0.00231 0.00231 0.00231 |
2.30947 2.30947 2.30947 |
44.980 44.830 43.800 |
0.005398 0.005380 0.005256 |
-2.267799 -2.269250 -2.279345 |
170 170 170 |
0.00226 0.00226 0.00226 |
2.25734 2.25734 2.25734 |
75.770 78.800 76.470 |
0.009092 0.009456 0.009176 |
-2.041321 -2.024293 -2.037328 |
Estimation of VTand PT: |
Log VT/at 20 °C Log PT/at 20 °C PT/at 20 °C |
-7.0442420 -3.2152005 0.0006093 |
|||
|
PT[Pa]/at 20 °c |
6.09E-04 |
|||
n.d. – not determined, the weight loss was not reproducible
Values of log VT and log PT of the reference items
Reference items |
PT20 °C Literature/Pa |
VT20 °C Extrapolation |
Water Naphthalene Hexachlorobenzene Chrysene |
2.34E+03 6.50E+00 1.45E-03 8.40E-07 |
3.64E-02 4.56E-04 4.07E-07 1.59E-10 |
Description of key information
The vapour pressure of the test item was calculated (mean of three determinations) to: 6.09 × 10-4 Pa at 20 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 0.001 Pa
- at the temperature of:
- 20 °C
Additional information
The isothermal thermogravimetric effusion method was applied for the determination of the vapour pressure of 6,6´-di-tert-butyl-2,2`-thiodi-p-cresol.
A value of the vapour pressure of the test item was determined using the data obtained between 140 °C and 170 °C. The vapour pressure of the test item was calculated (mean of three determinations) to: 6.09 × 10-4Pa at 20 °C.
This value however is expected to be overestimated, because it was determined from the molten material.
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