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EC number: 947-850-7 | 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:
- 12 Feb - 13 Feb 2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- not specified
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- not specified
- GLP compliance:
- no
- Type of method:
- effusion method: vapour pressure balance
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Test no.:
- #3
- Temp.:
- 50 °C
- Vapour pressure:
- 0.001 Pa
Reference
Individual Results
The vapour pressure was measured in the temperature range of 70 °C to 120 °C. According to sponsor's information the test item has several constituents. A molecular mass of 355.57 g/mol (C21H41NO3, stearoyl sarcosine, most abundant constituent) was used to calculate the vapour pressure according to the Hertz-Knudsen equation. The vapour pressures at the corresponding temperatures are listed in Table 1. After the measurement a mass loss of approx. 11 % (w/w) was determined of the starting sample weight (858.8 mg).
Table 1: Measured vapour pressures and corresponding temperatures
Temperature / °C |
Vapour pressure / hPa |
70 |
4.8 × 10-5 |
80 |
1.2 × 10-4 |
90 |
2.2 × 10-4 |
100 |
4.7 × 10-4 |
110 |
8.2 × 10-4 |
120 |
1.1 × 10-3 |
The vapour pressure values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C as shown in Table 2.
Table 2: Antoine parameters and extrapolated vapour pressures
T / °C |
p / hPa |
log (p/hPa) = A + B/(C+T[°C]) |
|
20 |
7.1 × 10-7 |
A = |
6.72748 |
25 |
1.2 × 10-6 |
B = |
-3774.82 |
50 |
1.1 × 10-5 |
C = |
273.15 |
Final Result
The following vapour pressure values for the test item were extrapolated from the experimental data (vapour pressure balance):
T / °C |
p / hPa |
p / Pa |
20 |
7.1 × 10-7 |
7.1 × 10-5 |
25 |
1.2 × 10-6 |
1.2 × 10-4 |
50 |
1.1 × 10-5 |
1.1 × 10-3 |
Description of key information
7.1E-5 Pa at 20 ºC (OECD 104, effusion method).
1.2E-4 Pa at 25 ºC (OECD 104, effusion method).
0.0011 Pa at 50 ºC (OECD 104, effusion method).
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
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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