| http://www.w3.org/ns/prov#value | - Examples of such preferred surfactants are nonionic surfactants such as polyoxyethylene alkyl esters, polyoxyethylene alkylphenol ethers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene alkylamine, polyoxyethylene fatty acid esters, glycerin, glycerin fatty acid esters, ethylene glycol, oxyethylenes, e.g. di-, tri- and tetra-ethylene glycols, oxypropylenes,
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