LAB (classified at 3817001000) is the world's most widely used feedstock for linear alkylbenzene sulfonate (LAS), the anionic surfactant in most household and industrial detergents. Its commercial volume and distinct chemical profile — a mixture of C10–C14 linear alkyl chains attached to a benzene ring — justify a dedicated tariff line separate from branched or other mixed alkylbenzenes. Importers should confirm chain-length distribution data from the supplier to support classification.

Heading 3817 explicitly excludes products of headings 2707 (oils and other products of the distillation of high-temperature coal tar) and 2902 (cyclic hydrocarbons). Mixed alkylbenzenes of 3817 are synthetic products produced by alkylation of benzene with olefins, not coal-tar distillates or pure cyclic hydrocarbons. The production route and chemical composition — specifically the presence of alkyl substituents on the benzene ring in a defined mixture — are the distinguishing classification criteria.