Reaction Initiators, Reaction Accelerators & Other Catalytic Preparations

The Mercury Export Ban Act and EPA regulations impose strict controls on mercury and mercury-added products. Importers should verify whether the mercury content triggers EPA notification or permit requirements, confirm that the import is not prohibited under applicable restrictions, and ensure the commercial invoice clearly identifies the mercury compound and its concentration. Consultation with a licensed customs broker and environmental counsel is strongly recommended.

Both fall under heading 381590, but the distinction matters for understanding the product's commercial function: initiators (such as organic peroxides) start a chemical reaction by generating reactive species, while accelerators (such as certain metal salts or amine compounds) increase the rate of an already-initiated reaction. For HTS purposes, both types are captured within the same heading, with the inorganic/organic distinction and specific metal identity driving the 10-digit line selection.