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Physical & Chemical properties

Surface tension

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Description of key information

surface tension of C8 -18 AAPB: 30.9 +/- 0.2 mN/m at 20°C 
surface tension of C12 AAPB: 32.0 +/- 0.2 mN/m at 20°C

Key value for chemical safety assessment

Surface tension:
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

In studies conducted according to DIN EN 14370 (Wilhelmy plate method), the surface tensions of C8 -18 AAPB and C12 AAPB were determined to be 30.9 +/- 0.2 mN/m and 32.0 +/- 0.2 mN/m at 20°C, respectively. All AAPBs are similar in structure, contain all the same zwitterionic structure. They differ, however, by their carbon chain length distribution and the degree of unsaturation (<=20%) in the fatty acid moiety. The content of minor constituents in all products are comparable and differ to an irrelevant amount. Based on the available data, it can be assumed that chain length distribution and degree of unsaturation of the fatty acid chain have a minor impact on this endpoint.