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EC number: 247-161-5 | CAS number: 25646-71-3
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:
- 06 Nov 2017 - 25 Mar 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
- 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
- Type of method:
- effusion method: isothermal thermogravimetry
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 0.022 Pa
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- 0.039 Pa
Reference
Individual Results
The results of the isothermal TGA analysis for the test item and the vapour pressure at 20 °C and 25 °C are given in Tables below. The vapour pressure regression curve was:
log PT= -4573 x 1/T + 13.93 (r = 0.991, n = 8).
Results of the Vapour pressure Isothermal TGA Analysis
Temperature[°C] |
Weight loss[µg/min] |
νT[g/cm2/h] |
log νT |
log PT |
PT[Pa] |
50 |
0.577993 |
6.90E-05 |
-4.16 |
-0.19 |
0.65 |
|
0.541545 |
6.46E-05 |
-4.19 |
-0.23 |
0.59 |
60 |
1.30189 |
1.55E-04 |
-3.81 |
0.26 |
1.8 |
|
1.08335 |
1.29E-04 |
-3.89 |
0.16 |
1.4 |
70 |
2.53401 |
3.02E-04 |
-3.52 |
0.63 |
4.3 |
|
1.97872 |
2.36E-04 |
-3.63 |
0.49 |
3.1 |
80 |
5.51356 |
6.58E-04 |
-3.18 |
1.06 |
12 |
|
4.56534 |
5.45E-04 |
-3.26 |
0.96 |
9.1 |
Vapour Pressure of the Test Item
Temperature[°C] |
log PT |
PT[Pa] |
PT [mm Hg] |
20 |
-1.67 |
2.2E-02 |
1.6E-04 |
25 |
-1.40 |
3.9E-02 |
3.0E-04 |
Conclusion
The isothermal TGA effusion method was applied for the determination of the vapour pressure of CD-3 / CAS 25646-71-3. The vapour pressure of the test item at 20 °C (293K) and 25 °C (298K) was:
|
Vapour Pressure at 20 °C |
Vapour Pressure at 25 °C |
||
|
(Pa) |
(mm Hg) |
(Pa) |
(mm Hg) |
Test Item |
2.2E-02 |
1.6E-04 |
3.9E-02 |
3.0E-04 |
Description of key information
Vapor pressure is 2.2E-02 Pa at 20 ºC and 3.9E-02 Pa at 25 ºC (OECD 104, effusion method).
Key value for chemical safety assessment
- Vapour pressure:
- 0.022 Pa
- at the temperature of:
- 20 °C
Additional information
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