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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Test method in accordance with EC A.4 and OECD 104. Well described study.
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Principles of method if other than guideline:
Isoteniscope method: vapour pressure at 100°C and 130°C
Dynamic method: vapour pressure at 161°C and 190°C
GLP compliance:
no
Type of method:
other: Isoteniscope method and Dynamic method
Temp.:
100 °C
Vapour pressure:
0.25 kPa
Remarks on result:
other: Isoteniscope method. Average result of two vapour pressure measurements (0.23 and 0.27 kPa).
Temp.:
130 °C
Vapour pressure:
0.78 kPa
Remarks on result:
other: Isoteniscope method. Average result of two vapour pressure measurements (0.76 and 0.80 kPa).
Temp.:
161.4 °C
Vapour pressure:
2 kPa
Remarks on result:
other: Dynamic method. Average result of two boiling point measurements (161.1 and 161.7°C) at reduced pressure.
Temp.:
190.2 °C
Vapour pressure:
5.2 kPa
Remarks on result:
other: Dynamic method. Average result of two boiling point measurements (190.1 and 190.3°C) at reduced pressure.

Precision of the isoteniscope method: ±10%

 

Precision of the dynamic boiling point determination: ± 35°C.

Precision of the dynamic vapour pressure determination: ±15%

 

 

Antoine equation : log P = A - B/(C + T)

 

with P in kPa and T in °C

 

The component specific constants are calculated by the least squares method to be:

A= 6.6240

B= 2950.675

C= 307.933

 

Predicted curve based upon Antoine equation: see attached figure.

 

Vapour pressure at 25°C calculated from the Antoine equation: 5.8E-03 kPa

Conclusions:
Using the isoteniscope method, the vapour pressure of 1,4-H6XDI at 100°C and 130°C was determined to be 0.25 kPa and 0.78 kPa, respectively.
Using the dynamic method, the vapour pressure of 1,4-H6XD at 161°C and 190°C was determined to be 2.00 kPa and 5.20 kPa, respectively.

The vapour pressure of 1,4-H6XDI at 25°C was calculated from the Antoine equation to be 5.8E-03 kPa.

Description of key information

The vapour pressure of the substance was calculated to be 5.8E-03 kPa at 25°C.

Key value for chemical safety assessment

Vapour pressure:
0.006 kPa
at the temperature of:
25 °C

Additional information

Calculated from the Antoine equation.