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EC number: 209-751-0 | CAS number: 592-35-8
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:
- From May 20, 2016 to June 03, 2016
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- GLP compliance:
- not specified
- Type of method:
- static method
- Specific details on test material used for the study:
- Batch No.: #120039110
purity: >95% (Composition: >95% Butyl carbamate; <5% n-Butanol) - Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 265 Pa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 328 Pa
- Conclusions:
- Under the study conditions, the vapour pressure of the test substance was determined to be 265 and 328 Pa at 20 and 25°C, respectively.
- Executive summary:
A study was conducted to determine the vapour pressure of the test substance, according OECD guideline 104 and EU Method A.4 (static method). 12 pairs temperature and vapour pressure were used to calculate a regression from which vapour pressure at ambient temperature was estimated. From the measured values, the vapour pressure of the test substance was calculated to be 265 Pa at 20.0 °C, and 328 Pa at 25 °C. The values of the heating and cooling down phase showed good correspondence (Krebs, 2016).
Reference
Calculation of results:
From the measured values for the increasing and for the decreasing temperature, log P (in log Pa) and 1/T (in 1/K) were calculated. The measured and the calculated values were plotted (p against T and log P against 1/T). The regression curve with slope B, intercept A and correlation r was calculated (graph log P vs. 1/T). From the values of these parameters, vapour pressures at 20.0 and at 25.0 °C were calculated using the following equation:
log P = B*(1/T)+A,
P (20°C) = 10E(B*(1/293.15)+A) and P (25°C) = 10E(B*(1/298.15)+A).
Description of key information
The vapour pressure was determined according OECD guideline 104 and EU Method A.4 (static method) (Krebs, 2016).
Key value for chemical safety assessment
- Vapour pressure:
- 265 Pa
- at the temperature of:
- 20 °C
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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