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Physical & Chemical properties

Vapour pressure

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vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
18th October 1999 to 20th October 1999
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of relevant results.
according to guideline
EU Method A.4 (Vapour Pressure)
GLP compliance:
yes (incl. QA statement)
Date of inspection: 23rd March 1998 Date of signature: 21st July 1998
Type of method:
effusion method: vapour pressure balance
Key result
25 °C
Vapour pressure:
0.2 Pa
Transition / decomposition:

Summary of results


Log10 [Vp(25°C)]

Vapour pressure (Pa)










Mean vapour pressure = 0.196 Pa

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

Please refer to the attached document for graphs produced from the three runs of Log10 Vapour Pressure vs Reciprocal Temperature

The vapour pressure of ST 03 C 99 was determined to be 0.2 Pa at 25°C.
Low volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA), < 500 Pa).
Executive summary:

Method: The vapour pressure was determined using a vapour pressure balance system (effusion method) with measurements being made at several temperatures and linear regression analysis used to calculate the vapour pressure at 25°C. The method employed was based on EU Method A4.

Results: The vapour pressure of ST 03 C 99 was determined to be 0.2 Pa at 25°C.

Description of key information

Experimental vapour pressure, extrapolated (but negligible).
Low volatility.

Key value for chemical safety assessment

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

Additional information

An experimental study on vapour pressure measurement of the test material, was conducted under GLP, and considered as fully reliable. Therefore the result is considered as key data.