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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:
From 01 to 15 February 2006
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
OECD Guideline Study. Purity and isomers composition specified. Restrictions for inaccuracy due to extrapolation.
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
27 July 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Directive 92/69/EEC
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
UK GLP Compliance Programme (inspected on August 30, 2005 / signed on November 21, 2005)
Type of method:
effusion method: vapour pressure balance
Specific details on test material used for the study:
- Storage condition of test material: approximately 4°C in the dark under nitrogen
Temp.:
25 °C
Vapour pressure:
< 0.01 Pa
Remarks on result:
other: Extrapolated Vapour Pressure was 0.0000075 Pa at 25 °C
Transition / decomposition:
no

Mean extrapolated vapour pressure from each run = 0.0075 +/- 0.0004 mPa.

Determination coefficients (R2) for the 6 runs ranged between 0.9944 and 0.9989.

Regression equations and graphs are provided in the experimental reports.

Conclusions:
Very low volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA), << 0.01 Pa).
Executive summary:

The vapour pressure of the test substance was measured under GLP according to OECD 104 / EU A4 guideline, vapour pressure balance method.

Six runs were conducted between 120 and 130°C. Vapor pressure at 25 °C was calculated by extrapolation from the mean.

The vapour pressure of the test item has been determined to be 0.0000075 Pa at 25°C.

Description of key information

Very low volatility (experimental, extrapolated).

Key value for chemical safety assessment

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

Additional information

A reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. Despite restrictions for inaccuracy, due to distant extrapolation, it is considered as a key study. The result is retained as key data.

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