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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2003
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions
Qualifier:
no guideline followed
Principles of method if other than guideline:
Measurement of vapour pressure with DSC (Differential Scanning Calorimetry)
GLP compliance:
not specified
Type of method:
other: differential scanning calorimetry (DSC)
Key result
Temp.:
20 °C
Vapour pressure:
0.011 Pa
Remarks on result:
other: The relationship between the pressure and the temperature was fitted with the Antoine model.

The product was measured at different pressures. The onset temperatures of boiling are given in the next table.. Further, the recalculated pressure is given for the Antoine fit.

Table 1: Vacuum DSC results of Trigonox 145 E-85

Measured

Antoine fit

Pressure (mbar)

Tboilingpoint (°C)

Calculated pressure after fit (mbar)

0.50

56.0

56.1

0.90

62.5

62.3

2.50

76.1

76.4

3.50

82.1

82.3

5.00

88.3

89.6

Table 2: Antoine fit parameters for Trigonox 145 E-85

product

Constant A

Constant B

Constant C

Temperature range (°C)

Trigonox 145 E-85

2.6497

192.47

-264.06

56 - 88

Antoine:

10log(p) = A - B/(C + T)

or

P = 10[A-B((C + T)]

T = B/(A –10log p) -C

where: A, B, C: constants

p: pressure (mbar)

T: temperature (K)

Table 3: Pressure table of Trigonox 145 E-85

Temperature (°C)

Pressure (mbar)

45

0.12 extrapolated

50

0.25 extrapolated

55

0.44 extrapolated

60

0.73

65

1.13

70

1.65

75

2.30

80

3.09

85

4.02

90

5.10 extrapolated

Conclusions:
At a temperature of 20 °C a vapour pressure of 0.010855 Pa was calculated for the test item.
Executive summary:

The vapour pressure of Trigonox 145 E-85 was measured at various temperatures with vacuum Differential Scanning Calorimetry (DSC). The vapour pressure of the test substance was measured in the temperature range of 56 - 88 °C. The relationship between the pressure and the temperature was fitted with the Antoine model. In the measured temperature range a vapour pressures between 56.1 and 89.6 mbar were calculated. The vapour pressure at 20 °C was calculated to be 0.010855 Pa.

Description of key information

At a temperature of 20 °C a vapour pressure of 0.010855 Pa was calculated for the test substance.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of Trigonox 145 E-85 was measured at various temperatures with vacuum Differential Scanning Calorimetry (DSC). The vapour pressure of the test substance was measured in the temperature range of 56 - 88 °C. The relationship between the pressure and the temperature was fitted with the Antoine model. In the measured temperature range a vapour pressure between 56.1 and 89.6 mbar were calculated. The vapour pressure at 20 °C was calculated to be 0.010855 Pa.