Perfluorooctane Sulfonic Acid (PFOS)
Perfluorooctane sulfonic acid (PFOS) is a fully fluorinated organic compound with a sulfonate group, classified as a sulfonated, halogenated derivative of hydrocarbons. It is a separate chemically defined compound under Chapter 29 note 1(a), and falls under this tariff item.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as a salt of PFOS
The subheading 2904.32 covers salts of perfluorooctane sulphonic acid, which is a sibling tariff item.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Declare the product as perfluorooctane sulfonic acid with its CAS number (1763-23-1) on the customs documents
• Check if the import is allowed under Canada's Prohibition of Certain Toxic Substances Regulations, as PFOS is subject to strict controls
• Provide a safety data sheet to CBSA
Related Products under Tariff item 2904.31.00
Ammonium Perfluorooctane Sulfonate
Ammonium perfluorooctane sulfonate is the ammonium salt of perfluorooctane sulfonic acid (PFOS). It is a chemically defined organic compound with a sulfonate group, and under Chapter 29 salt classification rules, it is classified with the corresponding acid in this tariff item.
Diethanolamine Perfluorooctane Sulfonate
Diethanolamine perfluorooctane sulfonate is a salt formed between diethanolamine (an organic base) and perfluorooctane sulfonic acid. According to Chapter 29 note 5(C)(2), salts formed between organic compounds are classified with the acid or base that occurs last in numerical order, which is the sulfonated acid, placing it under this tariff item.
High Purity PFOS 99% Technical Grade
High purity PFOS at 99% purity is a separate chemically defined organic compound, as it meets the criteria in Chapter 29 note 1(a) even with minor impurities. It is perfluorooctane sulfonic acid, a sulfonated, halogenated derivative of hydrocarbons, and falls under this tariff item.
Lithium Perfluorooctane Sulfonate
Lithium perfluorooctane sulfonate is the lithium salt of perfluorooctane sulfonic acid. As an inorganic salt of an organic acid, it is classified with the corresponding acid under Chapter 29 note 5(C)(1), placing it under this tariff item.
Perfluorooctane Sulfonyl Fluoride (POSF)
Perfluorooctane sulfonyl fluoride (POSF) is the acid fluoride derivative of perfluorooctane sulfonic acid. It is a halogenated, sulfonated derivative of a hydrocarbon and is explicitly covered by the tariff item's description, which includes perfluorooctane sulphonyl fluoride.
PFOS Stabilized with Triethanolamine
PFOS stabilized with triethanolamine is perfluorooctane sulfonic acid with a stabilizer added for preservation. Under Chapter 29 note 1(f), the addition of a stabilizer necessary for preservation or transport does not change the classification, so it remains under this tariff item.