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EC number: 213-796-1 | CAS number: 1013-75-8
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 1, 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
- Key result
- Temp.:
- ca. 20 °C
- Vapour pressure:
- ca. 1.27 Pa
- Key result
- Temp.:
- ca. 25 °C
- Vapour pressure:
- ca. 2.49 Pa
- Conclusions:
- The vapour pressure of the tested item is 1.27 Pa (20ºC) and 2.49 Pa (25ºC).
- Executive summary:
In accordance with OECD 104 (EEC A4) and GLP study, the vapour pressure was determinated using Effusion method: Knudsen cell possessing 0,1 mm orifice diameter. Vapour pressure was determinated by estimation of the masse of tested substance flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice of 0.1 mm diameter, under ultravacuum conditions.The vapour pressure of the tested item is 1.27 Pa (20ºC) and 2.49 Pa (25ºC).
Reference
Table No.1: Results of vapour pressure
Temperature ºC
|
Vapour pressure (Pa)
|
Evaporation rate (ug/min)
|
28.4 |
3.85 |
41.35 |
32.5 |
6.68 |
71.30 |
36.7 |
11.20 |
118.64 |
40.9 |
18.31 |
192.74 |
Vapour pressure of test item at 20ºCand 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 inºC,
a- 17.5835
b- 5124.17
R2- 0.9948
obtained for four measurement points: 28.4 32.5, 36.7 and 40.9ºC.
Description of key information
Key study: OECD guideline 104 and GLP study. The vapour pressure of the tested item is 1.27 Pa at 20ºC and 2.49 Pa at 25ºC.
Key value for chemical safety assessment
- Vapour pressure:
- 1.27 Pa
- at the temperature of:
- 20 °C
Additional information
Key study: In accordance with OECD 104 (EEC A4) and GLP study, the vapour pressure was determined. Effusion method: Knudsen cell was applied. The vapour pressure of the tested item is 1.27 Pa (20ºC) and 2.49 Pa (25ºC).
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