Poly[oxy(methyl-1,2-ethanediyl)], .alpha.-[2-[[2,2-dimethyl-3-[(1-oxododecyl)oxy]propylidene]amino]methylethyl]-.omega.-[2-[[2,2-dimethyl-3-[(1-oxododecyl)oxy]propylidene]amino]methylethoxy]-

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2015-02-24 to 2015-02-25

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Version / remarks:

adopted 23. Mar. 2006

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Version / remarks:

dated 24 August 2009

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7950 (Vapor Pressure)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: by loss of weight or by trapping vaporisate

Key result

Temp.:

20 °C

Vapour pressure:

0.001 Pa

Key result

Temp.:

25 °C

Vapour pressure:

0.001 Pa

The measured values for temperature and vapour pressure were evaluated as follows:

Evaluation of Calculated Values

Parameter	T	P	1/T	log P
Unit	K	Pa	1/K	log Pa
Values	303.2	1.77E-03	3.2982E-03	-2.7522
	318.2	4.50E-03	3.1427E-03	-2.3472
	333.2	8.80E-03	3.0012E-03	-2.0556

 A graph with log P vs. 1/T was plotted. Since the values were correlated by a linear relation, the data could be fitted by linear regression.

 

Parameters of Linear Regression

Parameter	Value
Slope	-2350.1
Intercept	5.0117
Correlation Coefficient r	-0.9978
Coefficient of Determination r^2	0.9956

 

The following vapour pressures were determined experimentally and considered as valid:

T	T	P	Stand. Dev. P	RSD P
°C	K	Pa	Pa	%
30.0	303.2	1.77E-03	3.68E-04	20.8%
45.0	318.2	4.50E-03	6.43E-04	14.3%
60.0	333.2	8.80E-03	2.84E-03	32.3%

 

Experiment 4 (nominal temperature 75 °C) showed clear signs of decomposition these measurements were not used for calculations.

 

Conclusions:

The vapour pressure of the test item was determined to be 0.000988 Pa at 20 °C and 0.00135 Pa at 25 °C, respectively.

Executive summary:

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at three different temperatures (30, 45, 60 and 75 °C) using the effusion method (weight loss). All measured values showed good to medium reproducibility, giving relative standard deviations of less than 30 %, and perfect correlation. Therefore, the result of the test according to the guideline criteria was considered to be valid. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure of the test item was determined to be 0.000988 Pa at 20 °C and 0.00135 Pa at 25 °C, respectively.

Description of key information

The vapour pressure of the test item was determined to be 0.000988 Pa at 20 °C and 0.00135 Pa at 25 °C, respectively.

Key value for chemical safety assessment

Vapour pressure:

0.001 Pa

at the temperature of:

25 °C

Additional information

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at three different temperatures (30, 45, 60 and 75 °C) using the effusion method (weight loss). All measured values showed good to medium reproducibility, giving relative standard deviations of less than 30 %, and perfect correlation. Therefore, the result of the test according to the guideline criteria was considered to be valid. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure was calculated to be 0.000988 Pa at 20 °C and 0.00135 Pa at 25 °C, respectively.