Reaction product of 2,4-bis(2-methylbutan-2-yl)phenol and phosphorous pentoxide

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 18 Sep 2017 to 02 Nov 2017

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)

Version / remarks:

2009

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Version / remarks:

2006

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7950 (Vapor Pressure)

Version / remarks:

1996

Deviations:

no

GLP compliance:

yes

Type of method:

effusion method: isothermal thermogravimetry

Test material

Test material information

Constituent 1

Reference substance name:

Bis(dipentylphenyl) hydrogen phosphate

EC Number:

264-629-4

EC Name:

Bis(dipentylphenyl) hydrogen phosphate

Cas Number:

64051-38-3

Molecular formula:

C32H51O4P

IUPAC Name:

bis(2,3-dipentylphenyl) hydrogen phosphate

Test material form:

liquid: viscous

Details on test material:

- Physical appearance: dark brown viscous liquid
- Storage conditions: at room temperature

Results and discussion

Vapour pressure

Vapour pressure 1

Key result

Temp.:

20 °C

Vapour pressure:

< 7.56 Pa

Vapour pressure 2

Key result

Temp.:

25 °C

Vapour pressure:

< 11.5 Pa

Any other information on results incl. tables

The log PT versus 1/T curve for the substance over the range 30 -50°C showed poor linearity (correlation coefficient r < 0.99). Extrapolation of the curve to 20°C or 25°C would not give reliable results for the vapour pressure of the substance at these temperatures. Since the weight losses of the test item at 30°C, 40°C and 50°C were lower than the weight losses of reference substance napthalene at the same temperatures, it was concluded that vapour pressure of the substance at 20°C (25°C) is lower than the vapour pressure of napthalene at 20°C (25°C).

 

The observed weight losses from 50°C were slightly non-linear. The test item is a UVCB. Observed weight losses might have been slightly influenced by the loss of low-molecular-weight components or by reaction and/or decomposition of the test item. During the determination of the vapour pressure, the test item was kept at elevated temperatures for a longer time than during the melting and boiling temperature study. Reaction and/or decomposition might, therefore, have occurred at lower temperatures than during the determination of the melting and boiling point (i.e. 75°C).

Applicant's summary and conclusion

Conclusions:

The vapour pressure of the substance at 20°C was determined to be < 7.56 Pa.
The vapour pressure of the substance at 25°C was determined to be < 11.5 Pa.

Executive summary:

The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method in a GLP study according to EC A.4, OECD 104 and OPPTS 830.7950.

From the measured weight losses in the temperature range 30 -50°C, the vapour pressure of the substance was determined to be lower than the vapour pressure of reference substance Napthalene.

The vapour pressure of the substance at 20°C and 25°C was concluded to be < 7.56 Pa and < 11.5 Pa, resp.