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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:
2018-05-23 to 2018-09-18
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
- Test item: Esterlac SLL
- CAS No.: 13557-75-0
- Molecular weight: 294.37 g/mol
- Sum formula: C18H31NaO6
- Identity: 64.2% aicd value, 194 saponification number
- Physical state: Light yellow paste
- Storage: 10 °C - 30 °C
Temp.:
20 °C
Vapour pressure:
0.002 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0.003 Pa
Temp.:
50 °C
Vapour pressure:
0.012 Pa

The vapour pressure was measured in the temperature range of 60 °C to 110 °C. The measured vapour pressures at the corresponding temperatures as well as the mass losses per time interval are given in Table 1. After the measurement a mass loss of approx. 10% (w/w) was determined.

Table 1: Measured vapour pressures and corresponding temperatures

Temperature / °C

Δm/Δt / g/min

Vapour pressure / hPa

60

2.8x10E-5

1.8x10E-4

70

4.8x10E-5

3.1x10E-4

80

8.6x10E-5

5.6x10E-4

90

1.1x10E-4

7.5x10E-4

100

1.6x10E-4

1.1x10E-3

110

2.1x10E-4

1.4x10E-3

The values for 20, 25 and 50 °C are calculated using Antoine constants. The vapour pressure values for the test item were extrapolated from the experimental data.

Conclusions:
The vapour pressure of the test item was determined according to OECD guideline 104 by effusion method using a Knudsen cell. The vapour pressure was measured in the temperature range of 60 °C to 110 °C. The vapour pressures for 20 °C, 25 °C and 50 °C were extrapolated from experimental data:
20 °C: 2.2 x 10E-3 Pa;
25 °C: 3.0 x 10E-3 Pa;
50 °C: 1.2 x 10E-2 Pa.
Executive summary:

The vapour pressure of the test item was determined according to OECD guideline 104 by effusion method using a Knudsen cell. The vapour pressure was measured in the temperature range of 60 °C to 110 °C. The vapour pressures for 20 °C, 25 °C and 50 °C were extrapolated from experimental data:

20 °C: 2.2 x 10E-3 Pa;

25 °C: 3.0 x 10E-3 Pa;

50 °C: 1.2 x 10E-2 Pa.

Description of key information

The vapour pressure of the test item was determined according to OECD guideline 104 by effusion method using a Knudsen cell. The vapour pressure was measured in the temperature range of 60 °C to 110 °C. The vapour pressures for 20 °C, 25 °C and 50 °C were extrapolated from experimental data:

20 °C: 2.2 x 10E-3 Pa;

25 °C: 3.0 x 10E-3 Pa;

50 °C: 1.2 x 10E-2 Pa.

Key value for chemical safety assessment

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

Additional information