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Physical & Chemical properties

Vapour pressure

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Administrative data

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2017-07-13 to 2017-09-05
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
TOXI-COOP ZRT., 8230 Balatonfüred, Arácsi út 97., Hungary
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Temp.:
25 °C
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 90 to 210 °C. For the evaluation the vapour pressure values in the range of 90 to 140 °C were used. Above 140 °C no reprodusible vapour pressure could be determined. This is due to the fact that the test item starts to melt and decompose above this temperature (refer to IUCLID Section 4.2 "Melting point / Freezing point").

Table 1. Results of the Effusion method

Stage No.

Temperature, °C

Δm/Δt, mg/min

Vapour pressure, Pa

1

90

7.0183 x 10-5

1.7096 x 10-2

2

100

3.6305 x 10-4

8.9647 x 10-2

3

110

9.9483 x 10-4

2.4891 x 10-1

4

120

2.2408 x 10-3

5.6794 x 10-1

5

130

2.9861 x 10-3

7.6642 x 10-1

6

140

4.5124 x 10-3

1.1724

Table 2: Regression data

Regression data of the vapour pressure curve -

regression output
Date of measurement Intercept Slope R. Squared
20 July 2017 13.1704  -5341.6991 0.9367
Conclusions:
The vapour pressure of the test item was extrapolated from the measured vapour pressure curve for the temperatures 20 and 25 °C: at 20 °C was 8.886x10-6 Pa and at 25 °C was 1.796x10-5 Pa, respectively.
Executive summary:

A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at temperatures between 90 and 210 °C using the effusion method (Knudsen cell). For the evaluation the vapour pressure values in the range of 90 to 140 °C were used. The determined melting point range of the test item was 185 to 190 °C. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C. The vapour pressure was calculated to be 8.886x10-6 Pa at 20 °C and 1.796x10-5 Pa at 25 °C, respectively.

Description of key information

The vapour pressure of the test item was extrapolated from the measured vapour pressure curve for the temperatures 20 and 25 °C: at 20 °C was 8.886x10-6 Pa and at 25 °C was 1.796x10-5 Pa, respectively.

Key value for chemical safety assessment

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

Additional information

A study (reference 4.6-1) was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at temperatures between 90 and 210 °C using the effusion method (Knudsen cell). For the evaluation the vapour pressure values in the range of 90 to 140 °C were used. The determined melting point range of the test item was 185 to 190 °C. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C. The vapour pressure was calculated to be 8.886x10-6 Pa at 20 °C and 1.796x10-5 Pa at 25 °C, respectively.