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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure of the substances in the category ranges from 143 kPa at 20°C to 4520 kPa at -83°C.

Key value for chemical safety assessment

Vapour pressure:
1 971 kPa
at the temperature of:
22 °C

Additional information

In accordance with section 2 of REACH Annex XI and Chapter R7a: endpoint specific guidance, the vapour pressure study does not need to be conducted as this substance has a boiling point less than 30°C, and therefore will have a vapour pressure above the limit of measurement (10^5 Pa).

Data are available for 95465-89-7 from a proprietary study conducted according to standard guidelines (Repsol 2009). Data from the CRC handbook (Lide 2008) were available for the substances methane, ethane, propane, butane and isobutane. The information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint.

The vapour pressure of methane is 4520 kPa at -83˚C, ethane is 3917 kPa at 22˚C, propane is 878 kPa at 22°C, butane is 221 kPa at 22°C and isobutane is 319 kPa at 22°C. The mean of the vapour pressure values for the category is 1971 kPa at 25°C and this has been used to complete the 'key value for chemical safety assessment'.