Bis(3,5-bis(1,1-dimethylethyl)-2-hydroxybenzoato-O1,O2)zinc

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

calculation (if not (Q)SAR)

Remarks:

Migrated phrase: estimated by calculation

Adequacy of study:

key study

Study period:

August 1985 to October 1985

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The test was not conducted to GLP but was conducted by a recognised accredited laboratory to an accepted method and study report is available.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1985

Report date:

1985

Materials and methods

Test guideline

Qualifier:

no guideline available

Principles of method if other than guideline:

On the basis of the results obtained with the melting point and boiling point experiments, it was concluded that the test substance has an extremely low vapour pressure which, if at all measurable, could be assessed only by gas saturation. This method was not available to the testing laboratory, so it was considered justifiable to calculate the vapour pressure using the modified Watson Correlation. For this, the normal boiling temperature (at atmospheric pressure) or a boiling temperature at reduced pressure is required as a parameter.

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Bis(3,5-bis(1,1-dimethylethyl)-2-hydroxybenzoato-O1,O2)zinc

EC Number:

403-360-0

EC Name:

Bis(3,5-bis(1,1-dimethylethyl)-2-hydroxybenzoato-O1,O2)zinc

Cas Number:

42405-40-3

Molecular formula:

C30H42O6Zn

IUPAC Name:

bis(3,5-bis(1,1-dimethylethyl)-2-hydroxybenzoato-O1,O2)zinc

Details on test material:

- Physical state: solid
- Impurities (identity and concentrations): Water content was measured by Karl Fischer titration and determined to be 2.2+/-0.1%
- Purity test date: Not stated
- Lot/batch No.: Not stated
- Expiration date of the lot/batch: Not stated
- Stability under test conditions: Not stated
- Storage condition of test material: Not stated

Results and discussion

Vapour pressure

Temp.:

ca. 25 °C

Vapour pressure:

< 0 Pa

Any other information on results incl. tables

Using the value 2/760 = 2.63 x 10 ^-3 atm for P₁ and 538K for T₁, the maximum value for P_s can be calculated for T=298K

P_s ≤ 1.4 x 10 ^-7 Pa (298K)

Applicant's summary and conclusion

Conclusions:

The actual value of the saturated vapour pressure of the test substance at room temperature may be considered to be several orders of magnitude lower than 0.00001Pa

Executive summary:

Due to the nature of the test substance and the observations during the melting and boiling point temperature tests, the vapour pressure could not be measured experimentally and was, therefore, calculated using the modified Watson correlation. Since the procedure has only been verified to yield reliable results down to pressures of 0.00001 Pa it was not possible to determine the actual vapour pressure with certainty. The calculation was concluded as a limit test and the vapour pressure is considered to be several orders of magnitude lower than 0.00001Pa.