| http://www.w3.org/ns/prov#value | - These surface active agents are classified into a natural surface active agent such as saponin, etc.; a nonionic surface active agent such as alkylene oxide type, glycerine type or glycidol type active agent; a cationic surface active agent such as a higher alkylamine, a quaternary ammonium salt, pyridine and other heterocyclic compounds, a sulfonium compound, or a phosphonium compound, etc.; an a
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