6,6'-(Ethane-1,2-diylbis(azanediyl))bis(dibenzo[c,e][1,2]oxaphosphinine-6-oxide)“

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016-11-03 - 2016-12-22

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: Knudsen cell

Specific details on test material used for the study:

Name EDA-DOPO
Batch no. 1501
Appearance white powder
Composition 6,6'-(Ethane-1,2-diylbis(azanediyl))bis(dibenzo[c,e][1,2]oxaphosphinine-6-oxide)
CAS No. 1421927-53-8
EINECS-No. not stated
Molecular formula C26H22N2O4P2
Molecular weight 488.4 g/mol
Purity >98% (NMR)
Homogeneity homogeneous powder

Key result

Test no.:

#1

Temp.:

150 °C

Vapour pressure:

0.001 Pa

Key result

Transition / decomposition:

no

The test item was weighed into the Knudsen cells until the latter were 2/3 full. The Knudsen cells were closed using a crimp-cap with hole and an aluminium plate with an aperture of 1 mm diameter.

Four Knudsen cells were prepared in this way and set into the vacuum chamber. The vacuum chamber was evacuated to 10^-05Pa or lower. Every day, vacuum was released; the Knudsen cells were taken out and weighed. After weighing, the cells were built in again and the vacuum was regenerated.

Throughout the measurement, the temperature of the vacuum chamber was held constant using an electrical heating device (± 1.0 °C).

First, the determination was performed at 30 °C. Then, further determinations were made at 45, 60, 75, 90, 105, 120, 135 and 150 °C.

Conclusions:

The vapour pressure of EDA-DOPO was determined following EU A.4 using the effusion method (weight loss).

Vapour pressure was examined at nine different temperatures. As all experiments showed no relevant or reproducible weight loss, a calculation on base of the measurement weight losses is not possible. Therefore the highest vapour pressure, derived from all measurements (except the first measurements at 30 °C), is stated as limit value.
Vapour pressure at 150 °C: 5.49 * 10-04 Pa.
This is the mean of the second measurement of experiment 9.

Executive summary:

The vapour pressure of EDA-DOPO was determined following EU A.4 using the effusion method (weight loss).

 

Vapour pressure was examined at nine different temperatures. As all experiments showed no relevant or reproducible weight loss, a calculation on base of the measurement weight losses is not possible. Therefore the highest vapour pressure, derived from all measurements (except the first measurements at 30 °C), is stated as limit value.

Vapour pressure at 150 °C:        5.49 * 10^-04Pa.

This is the mean of the second measurement of experiment 9.

Description of key information

The vapour pressure of EDA-DOPO was determined following EU A.4 using the effusion method (weight loss).

 

Vapour pressure was examined at nine different temperatures. As all experiments showed no relevant or reproducible weight loss, a calculation on base of the measurement weight losses is not possible. Therefore the highest vapour pressure, derived from all measurements (except the first measurements at 30 °C), is stated as limit value.

Vapour pressure at 150 °C:        5.49 * 10^-04Pa.

This is the mean of the second measurement of experiment 9.

Key value for chemical safety assessment

Vapour pressure:

5.49 Pa

at the temperature of:

150 °C