Both compounds are perfluorooctane sulfonate salts and share the same TSCA certification requirement at entry. However, they are classified under separate 6-digit HS headings (292340 vs. 292330) due to their distinct cation structures. Importers must ensure the correct 10-digit HTS line is declared and that any applicable EPA SNUR or reporting obligations specific to each compound are met separately.

Importers should prepare a TSCA import certification (CBP Form 3540 or equivalent electronic filing), a detailed product specification identifying the compound by CAS number, and any relevant Safety Data Sheets. Given the evolving PFAS regulatory environment, maintaining records of end-use applications is also advisable in case EPA requests additional information under TSCA Section 8 reporting rules.