Bis(2-ethylhexyl) phosphonate

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22 - 24 Jan 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Version / remarks:

2006

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7950 (Vapor Pressure)

Version / remarks:

1996

GLP compliance:

yes (incl. QA statement)

Remarks:

Hessisches Ministerium für Umwelt, Klimaschutz, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany

Type of method:

dynamic method

Test material

Test material information

Constituent 1

Reference substance name:

Bis(2-ethylhexyl) phosphonate

EC Number:

222-904-6

EC Name:

Bis(2-ethylhexyl) phosphonate

Cas Number:

3658-48-8

Molecular formula:

C16H35O3P

IUPAC Name:

bis(2-ethylhexyl) phosphonate

Results and discussion

Vapour pressure

Vapour pressure 1

Key result

Temp.:

20 °C

Vapour pressure:

0 Pa

Vapour pressure 2

Key result

Temp.:

25 °C

Vapour pressure:

0 Pa

Vapour pressure 3

Key result

Temp.:

50 °C

Vapour pressure:

0.009 Pa

Transition / decomposition

Transition / decomposition:

ambiguous

Transition temp.:

>= 120 - <= 160 °C

Any other information on results incl. tables

Thermal Stability results

An exothermic effect with an energy release of approximately -40 J/g was observed in the temperature range of 120 °C - 160 °C. Apart from that, the test item showed an endothermal effect with an energy consumption of minimum approximately 60 J/g starting at 255 °C. The test was terminated at 300 °C.

 

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 190.6 °C to 212.3 °C. The measured vapour pressure values together with the measured temperatures are listed in the following table:

No.	Temperature / °C	Vapour pressure / hPa	Remark
1	190.6	20	measured up
2	195.0	25	measured up
3	200.2	35	measured up
4	206.6	50	measured up
5	212.3	75	measured up
6	210.1	60	measured down
7	203 .1	40	measured down
8	196.7	30	measured down

 

From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation were derived by regression (Microsoft Excel):

 

A = 15.5810

B = -5695.92

C = 273.15

 

The vapour pressure of the test item calculated by extrapolation of the measured vapour pressure curve for the temperatures (20 °C, 25 °C, and 50 °C) are shown in the following table:

Temperature / °C	Vapour pressure / Pa
20	1.42E-04
25	3.00E-04
50	9.01E-03

 

Final Results

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 °C, 25 °C and 50 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006). The resulting vapour pressures are 1.42E-04, 3.00E-04 and 9.01E-03 Pa, respectively.