Sodium dichromate is specifically enumerated under 284130, while other chromates, dichromates, and peroxochromates not elsewhere specified fall under 284150. Beyond tariff classification, hexavalent chromium compounds are subject to EPA and OSHA hazard communication requirements, and importers should ensure proper SDS documentation accompanies shipments.

Section 301 measures apply at the 10-digit HTS line level and are country-specific. Lines covering permanganates, molybdates, and tungstates sourced from China have historically been subject to Section 301 scrutiny. Always verify current applicability against the USTR's Section 301 list before filing entry, as product exclusions and modifications occur periodically.