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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:
experimental dates: 17-23 October 2018
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
The study was conducted according to an internationally recognised method with no deviation, and under GLP. The substance is considered to be adequately characterised, with isomers composition. Therefore full validation applies.
according to guideline
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
23 March 2006
according to guideline
EU Method A.4 (Vapour Pressure)
Version / remarks:
(Commission Regulation No 440/2008, method last updated by Regulation (EC) No 761/2009)
GLP compliance:
yes (incl. QA statement)
signed on 15 Nov. 2018
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
Storage conditions of test material: Stored refrigerated (2-8°C) in aluminium bottle. An injection of nitrogen conditions gas is performed into the bottle after each sampling to keep the test item under nitrogen atmosphere during the storage period.
20 °C
Vapour pressure:
1.3 Pa
Key result
25 °C
Vapour pressure:
2.4 Pa

First trial

 Temperature (°C)  Vapour pressure (Pa)
 23.1  1.9891
 26.2  2.8845
 33.0  6.1989
 40.0  13.5556
 47.9  29.0465

Log10 (p (Pa)) = -4483.4/ T (K) + 15.437

R² = 0.9997

The above equation yields a vapour pressure of 1.39 Pa at 293.15 K and 2.51 Pa at 298.15 K.

Second trial

 Temperature (°C)  Vapour pressure (Pa)
 23.1  1.7609
 26.0  2.5559
 32.2  5.7162
 38.8  14.7677
 45.8  27.0002

Log10 (p (Pa)) = -5066.2/ T (K) + 17.353

R² = 0.9952

The above equation yields a vapour pressure of 1.18 Pa at 293.15 K and 2.29 Pa at 298.15 K.

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

Mean of trials 1 and 2: 1.29 Pa at 293.15 K (20°C) and 2.40 Pa at 298.15 K (25°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, under GLP, according to OECD 104 / EU A4 guideline, using the Knudsen effusion method.

Two trials were performed. For each trial, five pairs temperature/mass loss were used to calculate corresponding vapour pressure of the substance at temperatures between ca 25 and 50°C. Then the logarithm of the vapour pressure log10 (VP(Pa)) is plotted against 1/T(K), and the regression curve is used to calculate the vapour pressure of the substance at 20°C and 25°C.

The vapour pressure of the test substance is 1.3 Pa at 20°C and 2.4 Pa at 25°C.

Description of key information

Low volatility.

Key value for chemical safety assessment

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

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. Therefore, it is considered as a key study. The interpolated result at 25°C is retained as key value.