Produced by alkylating benzene or naphthalene with olefins, these mixtures serve as base fluids for industrial lubricants, heat-transfer oils, and electrical insulating fluids, as well as intermediates in detergent and surfactant manufacture. The heading explicitly excludes alkylbenzenes and alkylnaphthalenes already classified under specific chemical subgroups, so importers must verify that the product's composition does not fall within those excluded categories before applying this code. Linear alkylbenzene (LAB), a key detergent intermediate, is among the most commercially significant products in this space, though its classification depends on whether it meets the specific subgroup exclusions.

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