Registration Dossier

Diss Factsheets

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
27 May 2010 - 3 June 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study was performed according to guideline

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010
Report date:
2010

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance

Test material

Constituent 1
Chemical structure
Reference substance name:
Zinc bis[O,O-bis(2-ethylhexyl)] bis(dithiophosphate)
EC Number:
224-235-5
EC Name:
Zinc bis[O,O-bis(2-ethylhexyl)] bis(dithiophosphate)
Cas Number:
4259-15-8
Molecular formula:
Too complex
IUPAC Name:
1-Hexanol, 2-ethyl-, O,O-diester with phosphorodithioic acid, zinc salt
Details on test material:
- Substance type: a mixture of coordination compounds in oil consisting of a zinc metal complex bonded to alkyldithiophosphate ligands.

Results and discussion

Vapour pressureopen allclose all
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: extrapolated from plot of logPa vs. 1/K; quantity of vapour generated between 0 - 50 C was too low to measure
Temp.:
50 °C
Vapour pressure:
0.005 Pa
Remarks on result:
other: extrapolated from plot of logPa vs. 1/K; quantity of vapour generated between 0 - 50 C was too low to measure
Temp.:
70 °C
Vapour pressure:
0.024 Pa
Remarks on result:
other: 70 deg. C is the maximum use temperature of the substance

Any other information on results incl. tables

A total of 5 runs were recorded. A summary of the results is shown in Table 1 below. Raw data including temperature, mass, and pressure measurements for each of the runs are shown in attached Figures 1 - 5.

Table 1. Summary of Vapour Pressure Measurements

Run #

Vapour Pressure Values

25 C

50 C

70 C

1

-3.406

-2.344255

-1.609362

2

-3.183

-2.210785

-1.534883

3

-3.277

-2.278625

-1.584956

4

-3.497

-2.425791

-1.691464

5

-3.498

-2.434100

-1.694826

Mean logPa

-3.3722

-2.338711

-1.623098

Mean Pa

0.0004244

0.0045845

0.0238178

Mean kPa

4.2442E-07

4.5845E-06

2.3818E-05

Applicant's summary and conclusion

Conclusions:
The vapour pressure of the substance is 0.00042 Pa at 25 degrees C.
Executive summary:

The vapour pressure of the test substance was determined using the vapour pressure balance method following EU Method A.4 guidelines. Measurements were taken between temperatures of 105 - 115 degrees C.  This range of temperatures was selected because the quantity of vapor generated was too low to measure in the range of 0 - 50 degrees C.

 

A plot of logPa vs. 1/K was generated from the experimental measurements from which the vapour pressure at 25 and 50 degrees C was extrapolated.

 

The vapour pressure of the test substance (based on five replicate measurements) is:

 

0.00042 Pa at 25 deg. C

0.0046 Pa at 50 deg. C

 

The substance did not show a change in appearance under the conditions used in the determination.