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EC number: 931-291-0 | 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:
- 22 January 2018 - 24 January 2018
- 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:
- 2009
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- 1996
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: isothermal thermogravimetry
- Specific details on test material used for the study:
- The test material contained a high percentage of water.
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: the result is for the water-free (solid) part of the test item
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: the result is for the water-free (solid) part of the test item
- Conclusions:
- The vapour pressure of the solid, water-free part of the substance was determined to be 1.4E-7 Pa and 3.4E-7 Pa at 20°C and 25°C, resp.
- Executive summary:
The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method in a GLP study according to EC A.4, OECD 104 and OPPTS 830.7950. The constants specific for the experimental arrangement were determined using a set of five reference substances. Since the substance contained a high percentage of water,the measurements were performed at temperatures > 100°C to allow the water to evaporate before measuring weight loss as a function of time.
Weight losses of the substance were measured at 160°C, 170°C, 180°C and 190°C. The experiment was performed in duplicate. From all results, the vapour pressure regression curve (log PT as a function of 1/T; with T in K) of the substance was constructed. The vapour pressure of the solid, water-free part of the substance was calculated (extrapolated) from the vapour pressure curve to be 1.4E-7 Pa and 3.4E-7 Pa at 20°C and 25°C, resp.
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 30 January 2018 - 31 January 2018
- 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:
- 2009
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- 1996
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- effusion method: isothermal thermogravimetry
- Specific details on test material used for the study:
- The test material contained a high percentage of water.
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- < 0 Pa
- Remarks on result:
- other: the result is for the water-free (solid) part of the test item
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- < 0 Pa
- Remarks on result:
- other: the result is for the water-free (solid) part of the test item
- Conclusions:
- The vapour pressure of the solid, water-free part of the substance was determined to be below 8.4E-7 Pa and 6.6E-7 Pa at 20°C and 25°C, resp.
- Executive summary:
The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method in a GLP study according to EC A.4, OECD 104 and OPPTS 830.7950. The constants specific for the experimental arrangement were determined using a set of five reference substances. Since the substance contained a high percentage of water, the measurements were performed at temperatures > 100°C to allow the water to evaporate before measuring weight loss as a function of time.
Weight losses of the substance were measured at 160°C, 170°C, 180°C and 190°C. The experiment was performed in duplicate. From all results, the vapour pressure regression curve (log PT as a function of 1/T; with T in K) of the substance was constructed. The vapour pressure of the solid, water-free part of the substance was calculated (extrapolated) from the vapour pressure curve to be below 8.4E-7 Pa and 6.6E-7 Pa at 20°C and 25°C, resp.
Referenceopen allclose all
Table: Results of the isothermal TGA analysis (test item)
Temperature |
Weight loss |
vT |
log vT |
log PT |
PT |
160 |
1.82897 |
2.18E-4 |
-3.66 |
0.45 |
2.8 |
|
2.17308 |
2.59E-4 |
-3.59 |
0.55 |
3.5 |
170 |
3.84921 |
4.59E-4 |
-3.34 |
0.86 |
7.3 |
|
4.25036 |
5.07E-4 |
-3.29 |
0.92 |
8.3 |
180 |
7.02480 |
8.39E-4 |
-3.08 |
1.20 |
16 |
|
7.33234 |
8.75E-4 |
-3.06 |
1.22 |
17 |
190 |
12.1541 |
1.45E-3 |
-2.84 |
1.50 |
32 |
|
12.0631 |
1.44E-3 |
-2.84 |
1.50 |
32 |
Table: Results of the isothermal TGA analysis (test item)
Temperature |
Weight loss |
vT |
log vT |
log PT |
PT |
160 |
3.83284 |
4.58E-4 |
-3.34 |
0.86 |
7.3 |
|
2.76425 |
3.30E-4 |
-3.48 |
0.68 |
4.8 |
170 |
3.43070 |
4.10E-4 |
-3.39 |
0.80 |
6.3 |
|
4.63852 |
5.54E-4 |
-3.26 |
0.97 |
9.3 |
180 |
5.42985 |
6.48E-4 |
-3.19 |
1.06 |
11 |
|
7.28656 |
8.70E-4 |
-3.06 |
1.22 |
17 |
190 |
7.65709 |
9.14E-4 |
-3.04 |
1.25 |
18 |
|
10.6337 |
1.27E-3 |
-2.90 |
1.43 |
27 |
Description of key information
The vapour pressure of two representative substances was determined using the isothermal thermogravimetric effusion method in a GLP study according to EC A.4, OECD 104 and OPPTS 830.7950. Since the substances contained a high percentage of water, the measurements were performed at temperatures > 100°C to allow the water to evaporate before measuring weight loss as a function of time.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
The vapour pressures of substances (solids content) at 20°C was 1.4E-7 Pa and below 8.4E-7 Pa. The highest value of these two was considered key parameter for risk assessment purposes.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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