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EC number: 240-354-5 | CAS number: 16230-35-6
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:
- March 9, 2017
- 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
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: Knudsen cell
- Specific details on test material used for the study:
- STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: room temperature. - Key result
- Temp.:
- ca. 20 °C
- Vapour pressure:
- ca. 0.001 Pa
- Key result
- Temp.:
- ca. 25 °C
- Vapour pressure:
- ca. 0.002 Pa
- Conclusions:
- The determined vapour pressure of the test item was 0.00118 Pa at 20ºC and 0.00226 Pa at 25ºC.
- Executive summary:
The vapour pressure of the test item was determined according to OECD 104 and EU method A.4, following GLP, using an apparatus with Knudsen cell. The determined vapour pressure of the test item was 0.00118 Pa at 20ºC and 0.00226 Pa at 25ºC.
Reference
Vapour pressure at 20ºC and 25ºC was calculated on the basis of equation
log(p)=f(1/t)=a-b/(t+273.15)
where: p= vapour pressure in Pa, t=temperature in ºC, obtained for four measurements points: 90.9ºC, 95.7ºC, 100.4ºC and 105.2ºC.
| Temperature [ºC] (t) | Vapour pressure [Pa] (P) | Evaporation rate [µg/min] |
| 90.90 | 2.211 | 29.36 |
| 95.70 | 3.300 | 43.53 |
| 100.40 | 4.781 | 62.66 |
| 105.20 | 7.210 | 93.90 |
Equation ln(P)=a-b/(t+273,15) a= 13.8597 b= 4920.93 R2= 0.9933
Calculated values:
| Temperature [ºC] | Pressure [Pa] |
| 20 | 1.18 x 10-3 |
| 25 | 2.26 x 10-3 |
Description of key information
Key study: OECD 104 and EU method A.4. GLP study. The determined vapour pressure of the test item was 0.00118 Pa at 20ºC and 0.00226 Pa at 25ºC.
Key value for chemical safety assessment
- Vapour pressure:
- 0.002 Pa
- at the temperature of:
- 25 °C
Additional information
Key study: The vapour pressure of the test item was determined according to OECD 104 and EU method A.4, following GLP, using an apparatus with Knudsen cell. The determined vapour pressure of the test item was 0.00118 Pa at 20ºC and 0.00226 Pa at 25ºC.
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