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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study, EU guideline
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
2000-04-26
Type of method:
effusion method: vapour pressure balance
Temp.:
ca. 25 °C
Vapour pressure:
ca. 1.327 Pa
Remarks on result:
other: Extrapolation to 25°C gave a vapour pressure of 1.327 x i0 Pa which has been taken as a maximum for this material.

No statistical analyses were performed because the balance readings were too low and variable for a une of best fit to have any meaning. Instead it was considered more appropriate to impose a regression siope on a chosen data point to provide an estimate of the maximum value for the vapour pressure at 25°C.

Run 4 was chosen because the sample had been under vacuum for the longest period prior to this run and so degassing would have been the most complete. The reading at 90°C (363.15K) was chosen because this is the data point which gives the highest estimated vapour pressure at any given temperature when a siope of -1500K is imposed upon it.

The value of -1500K is an in-house value and is the shallowest slope observed whilst determining the vapour pressure on a wide range of samples using the vapour pressure balance method. Extrapolation to 25°C gave a vapour pressure of 1.327 x i0 Pa which has been taken as a maximum for this material.

The test material did flot change in appearance under the conditions used in the determination.

Conclusions:
The vapour pressure of the test material has been determined to be less than 1.4 x 10^-4 Pa at 25°C.
Executive summary:

Method.

The test procedure was Method A4 specified in Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC).

Result.

The test material has been determined to have a vapour pressure of less than 1.4 x 10^-4 Pa at 25°C, using a vapour pressure balance.

Description of key information

In compliance with the test procedure of the Method A4 specified in Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC),the test material has been determined to have a vapour pressure of less than 1.4 x 10-4 Pa at 25°C, using a vapour pressure balance.

Key value for chemical safety assessment

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

Additional information