Registration Dossier
Registration Dossier
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EC number: 627-034-4 | CAS number: 1213789-63-9
Surface tension
Administrative data
Link to relevant study record(s)
Description of key information
The surface tension of various C-chain pure hydrochlroides of primary fatty amines were determined experimentally according to OECD 115 guideline. Since primary amines exhibit a pKa of about 10.6 they appear protonated under environmental conditions. In order to determine their surface tension, the corresponding hydrochlorides thereof where used.
Key value for chemical safety assessment
- Surface tension:
- 28.15
Additional information
The surface tension of various C-chain pure hydrochlroides of primary fatty amines were determined experimentally according to OECD 115 guideline. Since primary amines exhibit a pKa of about 10.6 they appear protonated under environmental conditions.
In order to determine their surface tension, the corresponding hydrochlorides thereof were used. These results are summarized in table 1 below.
Table 1
| Substance | surface tension (1g/L) | surface tension (90% cmc) | report |
| Dodecan-1-amine | 51,3 | 10-74917.1 | |
| Tetradecan-1-amine | 23,1 | 27,3 | 10-74917.2 |
| Hexadecan-1-amine | 23,9 | 32,8 | 10-74917.3 |
| Octadecan-1-amine | 24,3 | 34,7 | 10-74917.4 |
| (Z)-octadec-9-en-1-amine | 27,2 | 31,9 | 10-74917.5 |
The data presented here at 1g/L and at 90% of the respective cmc (water solubility) shows that - exept for the substance with 12 linear C-atoms (dodecyl) - the surface tensions are within the same order of magnitude. Thus, the mean value of
28.15 mN/m
will be used as the default value for primary amines.
Assuming a surface tension of 72.75 mN/m for pure water, the primary fatty amines can be regarded as being surface active, as their surface tension is below 60 mN/m.
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