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EC number: 939-692-2 | CAS number: 1474044-73-9
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
- Key information: Vapour pressure (OECD 104, effusion method: vapour pressure balance): 2.1 x 10E-3 Pa at 25 °C (read-across from supporting substance '1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-nonanethiol');
- Supporting information: Vapour pressure [calculation according to the definition in the EEC-Directive 92/69/EEC, EU Method A.4 (Grain Watson estimation) because the experimentally determined vapour pressure of the test item was not in the recommended range of the used method] <= 6.1 Pa at 20 °C
Key value for chemical safety assessment
- Vapour pressure:
- 0.002 Pa
- at the temperature of:
- 25 °C
Additional information
The key value was determined on the supporting substance '1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-nonanethiol', using the effusion method according to OECD Guideline 104 / EU Method A.4. The study was performed in compliance with GLP and in accordance with the guideline. In general, this property gives an indication of the probability of the phase transitions liquid/gas and solid/gas. The quantity of substance leaving a cell per unit time through an aperture of known size is determined under vacuum conditions in such a way that return of the substance into the cell is negligible. As final result, the vapour pressure is reported to be 2.1 x 10E-3 Pa at 25 °C, calculated based on linear regression analysis. Finally, it is safe to say that the vapour pressure of the target substance ‘1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-dodecanethiol’ cannot be higher than the one of the short-chain homologue '1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-nonanethiol'.
A further vapour pressure value has been provided on the target substance '1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-dodecanethiol’ as a supporting study. At this the vapour pressure of the test item was determined by means of Differential Scanning Calorimetry (DSC) according to the test method A.4. "Vapour Pressure according to the Dynamic Method" as described in the Official Journal of the European Communities L383A. However, the experimentally determined vapour pressure of the test item was not in the recommended range of the used method and therefore a calculation / estimation according to the definition in the EEC-Directive 92/69/EEC, EU Method A.4 (Grain Watson estimation) was done. Unfortunately, the estimation did not provide an exact value: <= 6.1 Pa at 20 °C (estimation was based on the lowest possible boiling temperature).
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