3,3-bis(4-hydroxy-5-isopropyl-o-tolyl)phthalide

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2019

Report date:

2019

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

GLP compliance:

no

Type of method:

effusion method: Knudsen cell

Test material

Test material information

Constituent 1

Reference substance name:

3,3-bis(4-hydroxy-5-isopropyl-o-tolyl)phthalide

EC Number:

204-729-7

EC Name:

3,3-bis(4-hydroxy-5-isopropyl-o-tolyl)phthalide

Cas Number:

125-20-2

Molecular formula:

C28H30O4

IUPAC Name:

3,3-bis(4-hydroxy-5-isopropyl-o-tolyl)phthalide

Details on test material:

- Storage conditions: Room Temperature (20 ± 5 °C)
- Expiry date: 16. Dec. 2019

Results and discussion

Vapour pressure

Temp.:

90 °C

Vapour pressure:

0.002 Pa

Remarks on result:

other: Nine different temperatures were examined, but none could be evaluated (no reproducible or relevant weight loss). Calculation on base of measured weight losses is not possible, highest mean VP, derived from all measurements, is stated as limit value.

Applicant's summary and conclusion

Conclusions:

Vapour pressure was examined at nine different temperatures. No temperatures could be evaluated as they showed no reproducible or relevant weight loss. As a calculation on base of the measured weight losses is not possible, the highest mean vapour pressure, derived from all measurements, is stated as limit value.
Vapour pressure at 90 °C: 1.50* 10E-03Pa
The study was performed according to the OECD TG104 and EU Method A.4 without deviations and therefore considered to be of the highest quality (reliability Klimisch 1).

Executive summary:

The vapour pressure of the test item was determined in a study according to OECD 104 resp. EU Method A.4 ( effusion method: Knudsen cell).

The test substance 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 10E-07 Pa 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 and 75 °C. Due to organisational reasons, the cells were stored in an desiccator under argon between two measurement series. The positive control was tested in the same manner.

Vapour pressure was examined at nine different temperatures. No temperatures could be evaluated as they showed no reproducible or relevant weight loss. As a calculation on base of the measured weight losses is not possible, the highest mean vapour pressure, derived from all measurements, is stated as limit value.

Vapour pressure at 90 °C:       1.50* 10E-03Pa