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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:
06-08-1997
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted according to an internationally recognised method. The validation applies with some restrictions due to lack of information on substance identity and protocol In addition measurements are outside the recommended range and Vp at 20°C was obtained by a distant extrapolation.
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
Paris 1981
Deviations:
not specified
Principles of method if other than guideline:
Not applicable
GLP compliance:
not specified
Type of method:
dynamic method
Key result
Temp.:
20 °C
Vapour pressure:
0.161 Pa
Remarks on result:
other: Extrapolation

After regresion, the following parameters are obtained: P(T) = 10exp{A-[B/(t+C)]} (mmHg); P(T) = 10exp{ (A + 0.1249030) - [B/(t+C)]} (mbar); A=7.9027 B=2705.154 C=230.00T= temperature in °C P= pressure in mmHg or mbar

Boiling point (°C)

Flash point (°C)

Pressure at 20 °C (Pa)

Lower flammable limit (LFL) (% v/v)

Upper flammable limit (UFL) (% v/v)

Minimum Oxygen Concentration (MOC) (% v/v)

308.7 (extrapolated)

142 (extrapolated)

0.161 (extrapolated)

0.55 (calculated)

3.5 (calculated)

11.28 (calculated)

Conclusions:
The vapour pressure of the test substance has been determined to be 0.161Pa at 20 °C.
Low volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA), << 500 Pa).
Executive summary:

The vapour pressure of the test substance was measured according to OECD 104 guideline using a dynamic method (ebulliometer).

Four measurements were performed by determining the boiling temperature of the test item at various specified pressures.

Then, the vapour pressure at 20°C was extrapolated from the measured values using non-linear Antoine's equation.

Description of key information

Low volatility.

Key value for chemical safety assessment

Vapour pressure:
0.161 Pa
at the temperature of:
20 °C

Additional information

A reliable experimental study, conducted according to a recognized OECD/EC method is available. Despite restrictions due to extrapolation, It is considered as a key study. The result is retained as key data.