Registration Dossier
Registration Dossier
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EC number: 289-339-5 | CAS number: 87741-01-3
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
The vapour pressure of the substances in the category ranges from 143 kPa to 3917 kPa at 20 to 25ºC, with methane presenting a vaopur pressure of 4.45E+8 kPa at 25°C, which is 5-6 orders of magnitude higher than the rest.
Key value for chemical safety assessment
- Vapour pressure:
- 872 kPa
- at the temperature of:
- 22 °C
Additional information
Data are available for 95465-89-7 from a proprietary study conducted according to standard guidelines (Repsol 2009). The vapour pressure of 95465-89-7 is 143 kPa at 20°C.
Data from the CRC handbook (Lide 2008) were available for the substances methane, ethane, propane, 2-methylpropane (isobutane), 2-methylpropene, butane, butene and 1,3-butadiene. The information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint. Data for ethylene was taken from handbook by Zwolinski and Wilhoit (1971), which is peer reviewed and is considered reliable and suitable for use as the key study for this endpoint. Vapour pressure values of constituents at 20-25ºC have been extrapolated from results at lower temperatures. The vapour pressure of methane is 4.45 E+8 kPa at 25˚C, ethane is 3917 kPa at 22˚C, ethylene is 212.4 kPa at -90˚C, propane is 878 kPa at 22°C, 2-methylpropane is 319 kPa at 22°C, 2 -methylpropene is 1160 kPa, butane is 221 kPa at 22°C butene is 484 - 1100 kPa at 25ºC, and 1,3 -butadiene is 255 kPa at 22ºC.
The data available for these substances can be read across to other members of the category. The mean of the vapour pressure values for the category is 872 kPa at 22°C (excluding methane of the mean for having a value of orders of magnitude higher than the rest) and this has been used to complete the 'key value for chemical safety assessment'. This value may change for streams that do not contain 1,3 -butadiene.
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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