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EC number: 941-702-5 | CAS number: -
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:
- 19 September 2015 to 28 November 2015
- 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
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: isothermal thermogravimetry
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- <= 1.9 Pa
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- <= 0.014 mm Hg
- Temp.:
- 25 °C
- Vapour pressure:
- <= 3.1 Pa
- Temp.:
- 25 °C
- Vapour pressure:
- <= 0.023 mm Hg
- Conclusions:
- The vapour pressure of the test item at 20°C (293K) and 25°C (298K) was:≤ 1.9 Pa; ≤ 1.4e-2 mm Hg @ 20°C≤ 3.1 Pa; ≤ 2.3e-2 mm Hg @ 25°C
- Executive summary:
The purpose of the study was to determine the physico-chemical properties for Phenol, 1,1-dimethylpropyl derivs.
The study was performed to the following guidelines:
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.
Organization for Economic Co-operation and Development (OECD), OECD Guidelines for the Testing of Chemicals no.104: "Vapour Pressure", March 23, 2006.
United States Environmental Protection Agency (EPA), Product Properties Test Guidelines no. OPPTS 830.7950: "Vapor pressure", August 1996.
The isothermal TGA effusion method was applied for the determination of the vapour pressure of Phenol, 1,1-dimethylpropyl derivs.
The vapour pressure of the test item at 20°C (293K) and 25°C (298K) was:
20°C
25°C
[Pa]
[mm Hg]
[Pa]
[mm Hg]
Test item
≤ 1.9
≤ 1.4 x 10-2
≤ 3.1
≤ 2.3 x 10-2
The weight losses of the test item were obtained with a temperature program of above the melting temperature of the test item. According to this, the vapour pressure of the test item (which was, according to the method, extrapolated to 20°C and 25°C) could be slightly overestimated.
Reference
The melting range of the test item was 82 − 85°C. With the temperature program below the melting point of the test item significant, but not-repeatable weight loss was observed. This weight loss was probably caused by minor components. Therefore the weight loss of the test item was, furthermore, determined above its melting point. These experiments were repeatable and interpreted.
As the weight losses of the test item were obtained with a temperature program of above the melting temperature of the test item, the vapour pressure of the test item (which was, according to the method, extrapolated to 20°C and 25°C) could be slightly overestimated.
The equation of the curve was: log PT= -3747 x 1/T + 13.06 (r = 0.996, n = 12).
Results of the isothermal TGA analysis
Temperature [°C] |
Weight loss [μg/min] |
vT [g/cm2/h] |
Log vT |
Log PT |
PT [Pa] |
90 |
186.30 189.70 188.60 |
2.22 x 10-2 2.26 x 10-2 2.25 x 10-2 |
-1.65 -1.65 -1.65 |
2.72 2.73 2.72 |
5.2 x 102 5.3 x 102 5.3 x 102 |
100 |
346.20 350.70 348.30 |
4.13 x 10-2 4.19 x 10-2 4.16 x 10-2 |
-1.38 -1.38 -1.38 |
3.03 3.04 3.04 |
1.1 x 103 1.1 x 103 1.1 x 103 |
110 |
595.40 595.80 585.20 |
7.11 x 10-2 7.10 x 10-2 6.99 x 10-2 |
-1.15 -1.15 -1.16 |
3.31 3.31 3.30 |
2.0 x 103 2.0 x 103 2.0 x 103 |
120 |
908.60 851.70 871.50 |
1.08 x 10-1 1.02 x 10-1 1.04 x 10-1 |
-0.96 -0.99 -0.98 |
3.53 3.49 3.50 |
3.4 x 103 3.1 x 103 3.2 x 103 |
Vapour pressure of the test item
Temperature [°C] |
Log PT |
PT [Pa] |
PT [mm Hg] |
20 25 |
0.28 0.49 |
1.9 3.1 |
1.4 x 10-2 2.3 x 10-2 |
Description of key information
Key value determined using the isothermal TGA effusion method performed in a GLP accredited laboratory study according to OECD Guideline 104, EU Method A.4 & US EPA Procedure OPPTS 830.7950.
Key value for chemical safety assessment
- Vapour pressure:
- 1.9 Pa
- at the temperature of:
- 20 °C
Additional information
The vapour pressure of the test item at 20°C (293K) and 25°C (298K) was:
| 20°C | 25°C | ||
[Pa] | [mm Hg] | [Pa] | [mm Hg] | |
Test item | ≤ 1.9 | ≤ 1.4 x 10-2 | ≤ 3.1 | ≤ 2.3 x 10-2 |
The weight losses of the test item were obtained with a temperature program of above the melting temperature of the test item. According to this, the vapour pressure of the test item (which was, according to the method, extrapolated to 20°C and 25°C) could be slightly overestimated.
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