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EC number: 813-999-0 | CAS number: 59039-15-5
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- dynamic method
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 6.9 Pa
- Remarks on result:
- other: determined by extrapolation
- Conclusions:
- Vapour pressure of 4,8-dimethyl-2,5,7,10-tetraoxaundecane was calculated as 0.0515 Torr (6.9 Pa) at 20°C.
- Executive summary:
Vapour pressure of 4,8-dimethyl-2,5,7,10-tetraoxaundecane was measured by the dynamic method using an ebulliometer. The determination of the vapor pressure curve was done from 346.75 K to 482.12 K and 20 data points were collected. As 20 °C lies outside the temperature range of the data set, the vapour pressure at 20 °C was calculated by extrapolation.
Vapour pressure of 4,8-dimethyl-2,5,7,10-tetraoxaundecane was calculated as 0.0515 Torr (6.9 Pa) at 20°C.
Reference
The test included the measurement of vapor pressure at 20 temperatures (see below).
Based on all these data a log P versus 1/T curve was established. Its equation is :
log (P/Torr) = 6.99486 – 1546.42/(T/°C + 166.702)
Using this equation, the vapor pressure is calculated to be 0.051527 Torr (6.9 Pa) at 20 °C
| T / K | Pexp / kPa |
| 346.75 | 0.49 |
| 353.04 | 0.70 |
| 357.86 | 0.92 |
| 361.38 | 1.13 |
| 365.91 | 1.45 |
| 370.30 | 1.81 |
| 375.98 | 2.42 |
| 380.84 | 3.06 |
| 386.94 | 4.01 |
| 392.98 | 5.29 |
| 398.07 | 6.61 |
| 410.05 | 10.61 |
| 417.50 | 14.17 |
| 428.59 | 20.75 |
| 437.59 | 28.36 |
| 447.39 | 38.03 |
| 457.37 | 51.58 |
| 466.53 | 66.73 |
| 477.44 | 89.49 |
| 482.12 | 101.07 |
Description of key information
A guideline study was performed using the dynamic method with an ebulliometer. The determination of the vapor pressure curve was done from 346.75 K to 482.12 K and 20 data points were collected. As 20 °C lies outside the temperature range of the data set, the vapour pressure at 20 °C was calculated by extrapolation.
Key value for chemical safety assessment
- Vapour pressure:
- 6.9 Pa
- at the temperature of:
- 20 °C
Additional information
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