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EC number: 203-116-1 | CAS number: 103-48-0
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:
- 2015-05-29 to 2015-07-27
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: OECD Test Guideline 113 Screening Test for Thermal Stability and Stability in Air
- Version / remarks:
- 1981
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- 1996
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- dynamic method
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.34 hPa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0.45 hPa
- Key result
- Temp.:
- 50 °C
- Vapour pressure:
- 1.57 hPa
- Conclusions:
- The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure. Vapour pressure of the test item was determined to be 0.34, 0.45, 1.57 hPa at temperatures of 20, 25, 50 °C, respectively.
- Executive summary:
The vapour pressure of the test item was determined by dynamic method and calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4.
Before the test on vapour pressure, DSC measurement in a closed glass crucibles under nitrogen was performed up to a temperature of 300 °C with a heating rate of 3 K/min to determine the thermal stability of the test item. The test item showed an exothermic effect in the temperature range of 270 - 300 °C with an energy of 25 J/g.
The vapour pressure was measured in the temperature range of 97 to 151 °C. Within the experiment a vapour pressure curve with 9 data points was measured over a pressure range between 11 to 58 hPa. For control 3 measuring points were evaluated with decreasing pressure. Vapour pressure of the test item was extroplated using Antoine equation to determine values at 20, 25, and 50 °C, respectively.
Reference
Thermal stability
The test item showed an exothermic effect in the temperature range of 270 - 300 °C with an energy range of 25 J/g.
Dynamic method: Vapour liquid equilibrium (VLE)
Table 1. Results of the dynamic method
No. |
Temperature °C |
Vapour pressure hPa |
Remark |
1 |
97.0 |
11.0 |
measured up |
2 |
116.9 |
19.9 |
measured up |
3 |
129.5 |
29.9 |
measured up |
4 |
139.2 |
39.9 |
measured up |
5 |
145.6 |
49.6 |
measured up |
6 |
151.0 |
57.6 |
measured up |
7 |
142.5 |
44.3 |
measured down |
8 |
134.7 |
34.1 |
measured down |
9 |
123.4 |
24.6 |
measured down |
From the measured data points of the vapour pressure curve the constants A, B, and C of the Antoine equation can be derived by regression (Microsof Excel) of the data points to:
A = 8.7033
B = -2102.63
C = 273.15
Description of key information
The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure. Vapour pressure of the test item was determined to be 0.34, 0.45, 1.57 hPa at temperatures of 20, 25, 50 °C, respectively.
Key value for chemical safety assessment
- Vapour pressure:
- 0.45 hPa
- at the temperature of:
- 25 °C
Additional information
The vapour pressure of the test item was determined by dynamic method and calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4.
Before the test on vapour pressure, DSC measurement in a closed glass crucibles under nitrogen was performed up to a temperature of 300 °C with a heating rate of 3 K/min to determine the thermal stability of the test item. The test item showed an exothermic effect in the temperature range of 270 - 300 °C with an energy of 25 J/g.
The vapour pressure was measured in the temperature range of 97 to 151 °C. Within the experiment a vapour pressure curve with 9 data points was measured over a pressure range between 11 to 58 hPa. For control 3 measuring points were evaluated with decreasing pressure. Vapour pressure of the test item was extroplated using Antoine equation to determine values at 20, 25, and 50 °C, respectively.
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