Registration Dossier
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EC number: 239-590-1 | CAS number: 15541-60-3
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:
- 29 December 2003 to 2 January 2004
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP study conducted in accordance with an internationally recognised method
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: vapour pressure balance
- Temp.:
- 25 °C
- Vapour pressure:
- < 0 Pa
- Remarks on result:
- other: Based on detection limit of measuring apparatus
- Conclusions:
- The vapour pressure of the test material has been determined to be less than 9.5 x 10-6 Pa at 25 °C.
Reference
Five runs were undertaken.
No statistical analyses were performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate of the maximum value for the vapour pressure at 25°C. Run 5 was chosen because the sample had been under vacuum for the longest period prior to this run and so degassing would have been the most complete. The reading at 246°C (519.15 K) was chosen because this is the data point which gives the highest estimated vapour pressure at any given temperature when a slope of -1500 K is imposed upon it. The value of -1500 K is an in-house value and is the shallowest slope observed whilst determining the vapour pressure on a wide range of samples using the vapour pressure balance method. Extrapolation to 25°C gave a vapour pressure of 9.417 x 10-6 Pa which has been taken as a maximum for this material. The test material did not change in appearance under the conditions used in the determination.
Description of key information
The vapour pressure of the test material has been determined to be less than 9.5 x 10-6 Pa at 25 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
Vapour pressure was measured under vacuum over the temperature range 240 to 250 °C. Due to the low readings and scattered nature of the vapour pressure values a limit value was deduced by imposing a regression slope on a chose data point to provide as estimate of the maximum value of vapour pressure at 25°C.
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