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Surface tension properties of surfactant (BLES®). Maximum (max) and minimum (min) surface tension (nN/m) as determined by pulsating bubble meter in three runs as the bubble formed at the surface of the air/surfactant interface is subject to 20 pulsations per minute for 2 ½ minutes. After 25 pulsations the surface tension reaches a minimum of 2 ± 2 nN/m.
