| http://www.w3.org/ns/prov#value | - Examples of surface active agents include: natural surface active agents such as saponin; nonionic surface active agents such as alkylene oxide type, glycerine type or glycidol type agents; cationic surface active agents such as higher alkylamines, quaternary ammonium salts, pyridinium and other heterocyclic compounds, phosphoniums or sulfoniums; anionic surface active agents containing an acid gr
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