Registration Dossier
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EC number: 221-576-1 | CAS number: 3148-73-0
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
8.2x10-5Pa at 20°C, 1.8x10-4Pa at 25°C, OECD 104, gas saturation, Geoffrey
8.95x10-5Pa at 20°C, 1.82x10-4Pa, 25°C, no guideline, Knudsen cell, Takagi
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
Two vapour pressure studies are relevant and available. Geoffrey(2003) reported 8.2x10 -5Pa at 20°C and 1.8x10 -4Pa at 25°C in an OECD 104 guideline (gas saturation) study, which was assigned a Klimisch reliability rating of 1. Takagi(1959) reported data in the peer reviewed literature in a non-guideline experiment (using the Knudsen method), not conducted under a quality assurance system, which was assigned a Klimisch reliability rating of 3, primarily due to lack of reported experimental detail. The reported equation fitting the vapour pressure- temperature curve allowed the calculation of 8.95x10 -5Pa at 20°C and 1.82x10 -4Pa at 25°C, which is in very good agreement with the results from Geoffrey.
The value reported by Geoffrey is considered to be relevant, adequate, and reliable for risk assessment purposes; the endpoint is complete.
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