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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2001
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
other: Knudsen effusion method
Temp.:
25 °C
Vapour pressure:
< 0.001 Pa
Remarks on result:
other: The vapour pressure of 0.001 Pa equals an evaporation rate of 0.014 µg/s.

The measured evaporation rate of the mixture (< 1.5*10-3 µg/s) at 25 °C is significantly below the calculated value. Therefore, it can be assumed that the vapor pressure of the mixture and consequently of estr-4 -ene-3,17 -dione is lower than the lower limit of the measuring range recommended by the EC Testing Guideline.

In addition the mass spectra of the vapor escaping from the Knudsen cell show only masses m/e < 200 indicating that impurities with low molecular weights were evaporated from the mixture.

Conclusions:
The vapour pressure of the substance was measured to be <0.001 Pa at 25 °C.
Executive summary:

The vapor pressure was determined using a screening method based on the detection of the evaporation rate from a Knudsen cell of a vapor pressure balance at 25 °C. Since simplified experimental conditions are also acceptable within the scope of this project, the substance was mixed with four other compounds. From all five test substances low or very low vapor pressures were expected. For this reason the experiments consisted in the measurement of the evaporation rate of the mixture from a Knudsen cell a 25 °C. Since the evaporation rate of the mixture was below the value derived from the lower limit of the vapor pressure range recommended for the use of a vapor pressure balance (10-3 Pa, EC Testing Guideline A.4) it can be assumed that the vapor pressure of the mixture is lower than 10-3 Pa. Considering this fact, the vapor pressure of the single compounds in the mixture has also to be <0.001 Pa.

Description of key information

The vapour pressure of the substance was measured to be <0.001 Pa at 25 °C.

Key value for chemical safety assessment

Vapour pressure:
0.001 Pa
at the temperature of:
25 °C

Additional information

"Should read: < 0.001 Pa"

The substance is considered to be non volatile.