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EC number: 950-156-7 | CAS number: -
The vapour pressure of Bisamid was determined according to OECD 104 resp. EU A.4 using the effusion method (weight loss). Vapour pressure was examined at nine different temperatures. Three temperatures could be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (p).
Table 3-a: Vapour Pressures (Effusion Method)
Experiment T Mean p Stand. Dev. p RSD p
No. K Pa Pa %
5 363.2 8.93E-04 4.78E-05 5.4%
6 378.2 2.05E-03 5.94E-04 29.0%
7 393.2 6.94E-03 1.17E-03 16.9%
In this table, E-0X represents multiplication with 10-x. Stand. Dev. = Standard Deviation; RSD = Relative Standard Deviation
The graph 1/T vs. log (P) shows a straight line with a correlation coefficient of - 0.9912. For the test item Bisamid, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:
Vapour pressure at 20 °C: 1.37E-06 Pa
Vapour pressure at 25 °C: 2.40E-06 Pa
The vapour pressure of 1,3-bis[12-hydroxy-octadecamide-N-methylene]-benzene is assessed in a guideline study according to EU Method A.4 using the static method. The calculated vapour pressure
at 20 °C is 0.059 ± 0.005 Pa.
The vapour pressure of 12-hydroxyoctadecanoic acid, reaction products with 1,3-benzenedimethanamine and hexamethylenediamine is assessed in a guideline study according to EU Method A.4 using the effusion method (vapour pressure balance). The vapour pressure of the substance at 25 °C is 3.26 E-7 Pa.
The substance consists of multiple different constituents with similar chemical structure: N,N'-ethane-1,2-diylbis(12-hydroxyoctadecanamide), N,N'-hexane-1,6-diylbis(12-hydroxyoctadecanamide) and N,N'-[1,3-phenylenebis(methylene)]bis(12-hydroxyoctadecanamide).There are no experimental data on the multi-constituent substance available. The individual constituents and mixtures of similar structured amides are considered suitable read-across substances. Experimental results from guideline studies on read-across substances:
1,3-bis[12-hydroxy-octadecamide-N-methylene]-benzene: 0.059 Pa (20 °C),
12-hydroxyoctadecanoic acid, reaction products with 1,3-benzenedimethanamine and hexamethylenediamine: 3.26E-7 Pa (25 °C),
N,N'-ethane-1,2-diylbis(12-hydroxyoctadecanamide): 1.37E-6 Pa (20 °C).
As expected for molecules with relatively high molecular weights consisting of long alkyl chains the reported vapour pressures of the read-across substances are low. The properties of the multi-constituent substances is expected to be comparable because it consists of the same or structurally similar molecules. The volatility is considered to be very low and therefore the vapour pressure is negligible. The highest value reported for the read-across substances (0.059 Pa at 20 °C) is selected for chemical safety assessment. Further testing is not considered necessary.
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