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vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
16. - 19.10.1990
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: According to OECD guideline (1981) under GLP
Cross-referenceopen allclose all
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guideline
according to guideline
OECD Guideline 104 (Vapour Pressure Curve)
Principles of method if other than guideline:
Not relevant
GLP compliance:
Type of method:
static method

Test material

Constituent 1
Chemical structure
Reference substance name:
Reaction mass of [trans-1,1,4,4-Tetramethoxy-2-butene + cis-1,1,4,4-Tetramethoxy-2-butene]
EC Number:
Cas Number:
Molecular formula:
Reaction mass of [trans-1,1,4,4-Tetramethoxy-2-butene + cis-1,1,4,4-Tetramethoxy-2-butene]
Details on test material:
- Name of test material (as cited in study report): C4-Diacetale
- Physical state: liquid
- Analytical purity: 97.1%
- Storage condition of test material: sealed, in the dark at room temperature

Results and discussion

Vapour pressure
25 °C
Vapour pressure:
>= 40 Pa
Remarks on result:
other: 50+/- 10 Pa = 0.38 +/- 0.08 mmHg

Any other information on results incl. tables

During the measurements 1-30 at 24.11°C, a relatively large decline in vapour pressure could be observed. This is probably caused by the presence of a very volatile impurity. This impurity was removed after approximately 30 measurements, indicating that the amount of this impurity was relatively low. The decline in vapour pressure became much smaller during the measurements at 30.71°C and the vapour pressure became constant during the measurements at 37.11°C. Therefore, the vapour pressure did not show ideal behaviour. The consequence of this is that it is more difficult to determine "the vapour pressure" of the test substance because the composition of the vapour in the sample cell continuously changed. In order to obtain the vapour pressure at each temperature, the results in the vapour pressure readings were extrapolated (when necessary) to the first measurement at each series.

Applicant's summary and conclusion

The vapour pressure of the test substance at 25°C was determined to be: 50+/- 10 Pa = 0.38 +/- 0.08 mmHg
The vapour pressure of pure C4-DIACETAL was estimated t o be: 34 +/- 5 Pa = 0.26 +/- 0.04 mm Hg
Executive summary:

The determination of the vapour pressure was based on the following guidelines: European Economic Community (EEC),EEC directive 841449 EEC, Annex, Part A, Methods for the determination of physico-chemical properties, A.4: "Vapour pressure", EEC Publication no. L251, September 1984 and OECD guidelines for testing chemicals, Guideline No.104: "Vapour pressure curve", adopted May 12, 1981. The vapour pressure curve was constructed using the determination of the vapour pressure of C4 -DIACETAL at 24.11, 30.71 and 37.70°C, using the Static Technique. The vapour pressure of C4 -DIACETAL at 25°C was interpolated to be 50 Pa with an estimated error of +/- 10 Pa, i.e. 0.38 +/- 0.08 mm Hg. In case the last few measurements were back extrapolated to 25°C, using the slope of the vapour pressure curve, an estimation for the vapour pressure of pure C4 -DIACETAL could be made. The vapour pressure was estimated to be 34 +/- 5 Pa, i.e. 0.26 +/- 0.04 mm Hg at 25°C.

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