Perchlorates in this residual group attract particular regulatory attention because they are designated as a contaminant of concern by the EPA and are subject to export controls in some jurisdictions due to their use as oxidizers in solid rocket propellants and pyrotechnics. Bromates, iodates, and periodates serve more specialized roles — bromates in flour treatment and analytical chemistry, iodates and periodates as oxidants in organic synthesis and disinfection. The "not elsewhere specified" scope of this heading means correct classification often requires a detailed chemical specification sheet to distinguish the specific salt from those covered by more specific headings. Importers dealing in perchlorates should also verify whether the shipment triggers any dual-use export-control review in the country of origin.

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