trans-1,4-bis(isocyanatomethyl)cyclohexane

Vapour pressure

Link to relevant study record(s)

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

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Qualifier:

according to guideline

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: ± 3～5°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.