Ammonium Perfluorooctane Sulfonate
Ammonium perfluorooctane sulfonate is the ammonium salt form of PFOS, a fluorosurfactant precursor. It qualifies for HTS 2904.35.00.00 as an other salt of perfluorooctane sulfonic acid under the sulfonated, halogenated hydrocarbons of heading 2904.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the cation introduces nitrogen-function beyond simple salt
Complex nitrogen-containing salts may shift to amine salts in heading 2923 if not simple per chapter salt note.
If as aqueous solution for retail or specific use
Dilutions not solely for transport/safety fall outside chapter 29 per note (e).
If partially fluorinated, not perfluorinated
Only perfluorooctane (fully fluorinated) salts stay in this subheading; others go earlier.
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Import Tips & Compliance
• Declare exact cation (ammonium) and anion purity; customs may require NMR/FTIR spectra for verification
• Monitor EU REACH and US TSCA restrictions; many uses prohibited except for essential applications
• Ship in stabilized form only if meeting note (f); otherwise classify as impure mixture
Related Products under HTS 2904.35.00.00
Lithium Perfluorooctane Sulfonate
Lithium perfluorooctane sulfonate is the lithium salt of perfluorooctane sulfonic acid (PFOS), a fully fluorinated organic compound with a sulfonate group. It falls under HTS 2904.35.00.00 as one of the 'other salts' of PFOS, distinct from the acid itself or its sulfonyl fluoride, per chapter 29 rules for sulfonated halogenated hydrocarbons.
Potassium Perfluorooctane Sulfonate
Potassium perfluorooctane sulfonate (potassium PFOS) is a perfluorinated sulfonate salt used in specialty chemical applications. Classified under HTS 2904.35.00.00 as an 'other salt' of perfluorooctane sulfonic acid, fitting chapter 29 for halogenated sulfonated hydrocarbon derivatives.
Sodium Perfluorooctane Sulfonate
Sodium perfluorooctane sulfonate (Na-PFOS) serves as a surfactant intermediate with high surface activity due to its perfluoroalkyl chain. Under HTS 2904.35.00.00 as other PFOS salts, per chapter 29 for chemically defined sulfonated fluorohydrocarbons.
Diethanolamine Perfluorooctane Sulfonate
Diethanolamine perfluorooctane sulfonate pairs a organic base with PFOS for water-soluble applications. Classified in HTS 2904.35.00.00 as an other salt, following chapter rules for organic salts of sulfonated compounds.
Triethylammonium Perfluorooctane Sulfonate
Triethylammonium perfluorooctane sulfonate is an ionic liquid precursor from PFOS and triethylamine. It fits HTS 2904.35.00.00 for other PFOS salts as a chemically defined sulfonated perfluoro compound.
Pyridinium Perfluorooctane Sulfonate
Pyridinium perfluorooctane sulfonate uses pyridine as cation with PFOS anion for catalytic uses. Under HTS 2904.35.00.00 as specified other salts of perfluorooctane sulfonic acid in heading 2904.