Because NAICS 32599 is a catch-all for specialty and miscellaneous chemical preparations, individual products can span dozens of HTS headings depending on their chemical composition, concentration, and intended application. A product's classification may shift if its formulation changes even slightly, making pre-import binding ruling requests from CBP a prudent step for novel or multi-component preparations.

Section 301 tariffs apply to a wide range of chemical products originating in China, but coverage is determined at the 10-digit HTS level. Importers should map each product to its specific HTS code and cross-reference the current Section 301 annexes, as some specialty preparations are covered while structurally similar ones may not be.