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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:
2008.05.09-2008.05.12
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP-Guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
The Department of Health of the Government of the United Kingdom
Type of method:
effusion method: vapour pressure balance
Temp.:
25 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: vapour pressure balance
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.

Run 4 (from 5 runs) 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 91 °C (364.15 K) was chosen because this is the data point which gives 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 4.150x10 -4 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 substance Pentaerythritol tetra (3-mercaptopropionate) has been determined to be less than 0.00042 Pa at 25 °C.
Executive summary:

The test substance Pentaerythritol tetra (3-mercaptopropionate) has been determined to have a vapour pressure of less than 0.00042 Pa at 25 °C by using a vapour pressure balance, according to Method A4 of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC).

Description of key information

Vapour pressure: < 4.2x10-6 hPa at 25 °C
Tremain, S.P. (2008)

Key value for chemical safety assessment

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

Additional information

In the experimental laboratory study the vapour pressure of the test material THIOCURE PETMP, Pentaerythritol tetra (3-mercaptopropionate) has been determined to be less than 4.2x10-6 hPa at 25 °C. The studies were carried out by using a vapour pressure balance, according to Method A4 of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC).

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