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Vapour pressure

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vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1 (reliable without restriction)
according to guideline
other: ASTM D6378-2010 Standard Test Method for Determination of Vapor Pressure (VPX) of Petroleum Products, Hydrocarbons, and Hydrocarbon-Oxygenate Mixtures (Triple Expansion Method)
Principles of method if other than guideline:
Employing the apparatus, MINIVAP VPXpert Vapor Pressure Tester, a certain volume of the sample is drawn into the temperature controlled chamber with a built-in piston. After sealing the chamber, an expansion is performed in three steps to a final volume of (X+1) times that of the test specimen. After each expansion, the total pressure (TPx) is determined. The partial pressure from dissolved air (PPA) and the solubility of air in the specimen can be calculated from the three resulting pressures. The temperature of the chamber is then increased to a specified value, and the TPx is determined. The vapor pressure (VPx) can be obtained by sub-tracting the PPA in the liquid, which has been gas corrected for the temperature, from TPx.
GLP compliance:
Type of method:
other: Triple Expansion Method
Test no.:
ca. 20 °C
Vapour pressure:
ca. 13.6 kPa

The test result of n-pentane vapor pressure was within 107.8 kPa ±0.5 kPa, this is compliance with the test requirement.

According to the determination, the vapor pressure of the sample is 13.6 kPa (20.0℃).

The vapor pressure of the sample is 13.6 kPa (20.0°C).

Description of key information

Key value for chemical safety assessment

Vapour pressure:
13.6 kPa
at the temperature of:
20 °C

Additional information