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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
February 2003
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Justification for type of information:
Study was carried out according to generally valid and internationally accepted testing guidelines and under GLP. The substance is considered to be adequately characterised. However, restrictions apply, due to large extrapolation and estimation of the maximum vapour pressure.
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Cited as Directive 92/69/EEC, A.4
GLP compliance:
yes (incl. QA statement)
Remarks:
Inspection date : 2 December2002; Certificate date : 13 February 2003
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
25 °C
Vapour pressure:
< 0 hPa
Transition / decomposition:
no

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

The run in which the sample had been under vacuum for the longest period prior to the run was chosen for this, because gassing would have been the most complete. The reading at 191°C (464.15 K) was taken, because this was the data point which gave the highest estimated vapour pressure at any given temperature when a slope of -1500 K is imposed upon it. The value of -1500 K 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 3.438. 10-5 Pa which has been taken as a maximum for this material.

The test material did not change in appearance under the conditions used in the determination.

Conclusions:
The vapour pressure of the test item is less than 3.5.10-7 hPa at 25°C
Executive summary:

The vapour pressure of test item was determined according to EU method A.4 guideline (using vapour pressure balance method) and under GLP.

The vapour pressure of the test item is less than 3.5. 10-7 hPa at 25°C.

This data is considered as a key data.

Description of key information

< 3.5 x 10-7 hPa at 25°C

Key value for chemical safety assessment

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

Additional information

A reliable experimental study, conducted according to a recognized EC method and under GLP, is available. It is considered as a key study.

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