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EC number: - | 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:
- 28.-29.08.2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- GLP compliance:
- no
- Type of method:
- effusion method: vapour pressure balance
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Temp.:
- 50 °C
- Vapour pressure:
- 0 Pa
- Conclusions:
- The vapour pressure of the test item was determined to be 6.5 E-7 Pa (20 °C) ,1.5 E-6 Pa (25 °C) and 5.5 E-5 Pa (50 °C).
- Executive summary:
A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured using the Knudsen cell at various temperatures between about 75 °C and 100 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results: 6.5 E-7 Pa (20 °C) ,1.5 E-6 Pa (25 °C) and 5.5 E-5 Pa (50 °C).
Reference
The vapour pressure was measured in the temperature range of 75 °C and 100 °C. The measured vapour pressures at the corresponding temperatures are listed in the Table 1. After the measurement a mass loss of approx. 2 % (w/w) was determined. A molecular mass of 324.82 g/mol was used for the evaluation.
Table 1: Measured vapour pressures and corresponding temperatures
Temperature /°C | Vapour pressure / hPa |
75 | 1.6 x 10-5 |
80 | 2.0 x 10-5 |
85 | 3.2 x 10-5 |
90 | 6.1 x 10-5 |
95 | 1.2 x 10-4 |
100 | 2.0 x 10-4 |
The 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 | 6.5 x 10-9 | A = 12.52949 |
25 | 1.5 x 10-8 | B = -6072.19 |
50 | 5.5 x 10-7 | C = 273.15 |
Description of key information
A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured using the Knudsen cell at various temperatures between about 75 °C and 100 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results: 6.5 E-7 Pa (20 °C) ,1.5 E-6 Pa (25 °C) and 5.5 E-5 Pa (50 °C).
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °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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