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EC number: 606-384-1 | CAS number: 19797-08-1
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:
- 26 Mar - 19 Apr 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:
- adopted in March 04, 2016
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- adopted in March 23, 2006
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- adopted in August 1996
- GLP compliance:
- yes
- Type of method:
- effusion method: isothermal thermogravimetry
- Specific details on test material used for the study:
- Test item storage:
At room temperature protected from light - Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 5.2 Pa
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- 8.8 Pa
Reference
The results of the isothermal TGA analysis for the test item and the vapour pressure at 20°C and 25°C are given in Table 2 and Table 3.
The equation of the vapour pressure regression curve (log PT of the test item as function of the reciprocal temperatures) was: log PT = -4041 × 1/T + 14.5 (r = 0.998, n = 8).
Table 2: Results of the Vapour pressure Isothermal TGA Analysis
Temperature [°C] |
Weight loss [μg/min] |
vT [g/cm2/h] |
log vT |
log PT |
PT [Pa] |
40 |
14.6229 |
1.75 × 10-3 |
-2.76 |
1.61 |
40 |
|
13.7577 |
1.64 × 10-3 |
-2.78 |
1.57 |
37 |
50 |
28.5845 |
3.41 × 10-3 |
-2.47 |
1.98 |
95 |
|
29.1972 |
3.49 × 10-3 |
-2.46 |
1.99 |
98 |
60 |
61.2703 |
7.31 × 10-3 |
-2.14 |
2.40 |
250 |
|
61.0692 |
7.29 × 10-3 |
-2.14 |
2.40 |
250 |
70 |
105.708 |
1.26 × 10-2 |
-1.90 |
2.71 |
510 |
|
104.459 |
1.25 × 10-2 |
-1.90 |
2.70 |
500 |
Table 3: Vapour Pressure of the Test Item
Temperature [°C] |
log PT |
PT [Pa] |
PT [mm Hg] |
20 |
0.71 |
5.2 |
3.9 × 10-2 |
25 |
0.95 |
8.8 |
6.6 × 10-2 |
Conclusion
The isothermal TGA effusion method was applied for the determination of the vapour pressure of N-ethylcaprolactam.
The vapour pressure of the test item at 20°C (293K) and 25°C (298K) was:
20°C (293K): 5.2 Pa = 3.9 × 10-2 mm Hg
25°C (298K): 8.8 Pa = 6.6 × 10-2 mm Hg
Description of key information
5.2 Pa at 20 °C, 8.8 Pa at 25 °C (isothermal thermogravimetry, OECD 104)
Key value for chemical safety assessment
- Vapour pressure:
- 5.2 Pa
- at the temperature of:
- 20 °C
Additional information
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