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Vapour pressure

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Description of key information

Determination of the Vapour Pressure of Phosflex 71B by Isothermal Thermogravimetry

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information

Three methods were tested in order to determine the vapor pressure of Phosflex 71B:


VP value [Pa]

Recommended range according to OECD 104.

spinning rotor gauge method

1.08*10^-3 (20 oC)

10^-4 to 0.5 Pa

Effusion method: vapour pressure balance

4.2*10^-5 (25 oC)

10^-3 to 1 Pa

Effusion method: isothermal


3.23*10^-4 (20 oC)

10^-10 to 1 Pa

In the spinning rotor gauge method and effusion method: vapour pressure balance the values determined are out of the guideline recommended range. Thus, the vapor pressure of Phosflex 71B was found to be 3.23 x 10^-4 Pa at 20 degrees Celsius using effusion method: isothermal thermogravimetry .