Bis(4-(1,1,3,3-tetramethylbutyl)phenyl) ether

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

May 12, - June 17, 2020

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

Key result

Test no.:

#1

Temp.:

20 °C

Vapour pressure:

0 Pa

Test no.:

#2

Temp.:

25 °C

Vapour pressure:

0 Pa

Since the values were correlated by a linear relation (see attached file), the data could be fitted by linear regression.

 

Table: Parameters of linear regression 

Parameter	Value
Slope	-4664.4
Intercept	12.1233
Correlation Coefficient r	-0.9952
Coefficient of Determination r^2	0.9904

Results

The following vapour pressures were determined experimentally and considered as valid (mean and standard deviation given):

Table: Experimentally Determined Vapour Pressures

T	T	P	Stand. Dev. P	RSD P
^oC	K	Pa	Pa	%
45.0	318.2	3.40E-03	4.32E-04	12.7%
60.0	333.2	1.03E-02	2.32E-03	22.4%
75.0	348.2	5.47E-02	1.09E-02	20.0%
90.0	363.2	2.06E-01	2.38E-02	11.6%

In this table, E-x represents * 10 ^-x.

For the test substance bis(4-(1,1,3,3-tetramethylbutyl)phenyl)ether, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:

Vapour pressure at 20 °C:        1.63* 10^-04Pa

Vapour pressure at 25 °C:        3.01* 10^-03Pa

 

The linear regression of log p vs. 1/T gave a correlation coefficient r of - 0.9952, showing good repeatability and precision. Therefore, the determination is considered as valid.

Conclusions:

Vapour pressure of bis(4-(1,1,3,3-tetramethylbutyl)phenyl)ether was measured using the Effusion method following Knudsen cell as described in OECD 104 .
From the measured values, the vapour pressure of the test substance bis(4-(1,1,3,3-tetramethylbutyl)phenyl)ether was calculated as 0.000163 Pa at 20.0 °C, and 0.000301 Pa at 25 °C.

Description of key information

Vapour pressure of bis(4-(1,1,3,3-tetramethylbutyl)phenyl)ether was measured using the Effusion method following Knudsen cell as described in OECD 104 .

From the measured values, the vapour pressure of the test substance bis(4-(1,1,3,3-tetramethylbutyl)phenyl)ether was calculated as

0.000163 Pa at 20.0 °C, and 0.000301 Pa at 25 °C.

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

20 °C