Reaction product of o-cresol and camphene, obtained by addition, hydrogenation and distillation

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03 Jul - 11 Aug 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7950 (Vapor Pressure)

GLP compliance:

no

Type of method:

effusion method: Knudsen cell

Key result

Temp.:

20 °C

Vapour pressure:

0.027 Pa

Temp.:

25 °C

Vapour pressure:

0.046 Pa

Temp.:

50 °C

Vapour pressure:

0.53 Pa

Results

 

Thermal Stability

The test item in a closed glass crucible showed an exothermic effect in the temperature range of 150 - 200 °C, with a decomposition energy of -20 J/g.

 

Effusion method: Knudsen cell

The vapour pressure was measured in the temperature range of 41 to 71 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table.

 

Results of the Effusion method

No.	Temperature / °C	Vapour pressure / Pa
1	40.6	0.215
2	45.6	0.377
3	50.7	0.571
4	55.7	0.868
5	60.8	1.36
6	65.8	2.06
7	70.9	3.21

 

The measured vapour pressures at 65.8 and 70.9 °C are slightly outside the measuring range (10^-3to 1 Pa) of the Knudsen cell. Nevertheless, as the vapour pressure value above 1 Pa could be detected properly by the Knudsen cell, this value can be used for the evaluation.

 

From the measured data points of the vapour pressure curve, the constants A, B and C of the Antoine equation were calculated:

 

Antoine equation

 

Log10 p = A +  B / ( C + θ )

 

A = 12.4278

B = -4104.03

C = 273.15

 

 

Final Results

The vapour pressure of the test item was calculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006).

 

Temperature / °C	Vapour pressure / Pa
20	2.7E-2
25	4.6E-2
50	5.3E-1

Conclusions:

Vapour pressure values of 0.027 Pa (at 20 °C), 0.046 Pa (at 25 °C) and 0.53 Pa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 0.027 Pa at 20 °C, 0.046 Pa at 25 °C, and 0.53 Pa at 50 °C (EU Method A.4., effusion method: Knudsen cell)

Key value for chemical safety assessment

Vapour pressure:

0.046 Pa

at the temperature of:

25 °C

Additional information

According to Regulation EC No. 440/2008 Method A.4, the vapour pressure values of the test item for the temperatures 20, 25 and 50 °C were calculated by extrapolation of the measured vapour pressure curve.