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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

vapour pressure
Type of information:
calculation (if not (Q)SAR)
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Study period:
August 1985 to October 1985
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 Type:
study report
Report date:

Materials and methods

Test guideline
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:

Test material

Constituent 1
Chemical structure
Reference substance name:
EC Number:
EC Name:
Cas Number:
Molecular formula:
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
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 Ps can be calculated for T=298K

Ps 1.4 x 10 -7 Pa (298K)

Applicant's summary and conclusion

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.